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Import QEMU upstream snapshot d2e570c

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Upstream: https://gitlab.com/qemu-project/qemu.git

Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
This commit is contained in:
Yaya48
2026-08-31 02:15:30 +02:00
commit cf256aa081
11315 changed files with 3598369 additions and 0 deletions
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semihosting/Kconfig
+8
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@@ -0,0 +1,8 @@
config SEMIHOSTING
bool
depends on TCG
config ARM_COMPATIBLE_SEMIHOSTING
bool
select SEMIHOSTING
semihosting/arm-compat-semi-stub.c
+18
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@@ -0,0 +1,18 @@
/*
* Stubs for platforms different from ARM
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "semihosting/semihost.h"
bool semihosting_arm_compatible(void)
{
return false;
}
void semihosting_arm_compatible_init(void)
{
g_assert_not_reached();
}
semihosting/arm-compat-semi.c
+826
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@@ -0,0 +1,826 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
* semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
* Written by Paul Brook.
*
* Copyright © 2020 by Keith Packard <[email protected]>
* Adapted for systems other than ARM, including RISC-V, by Keith Packard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
* ARM Semihosting is documented in:
* Semihosting for AArch32 and AArch64 Release 2.0
* https://github.com/ARM-software/abi-aa/blob/main/semihosting/semihosting.rst
*
* RISC-V Semihosting is documented in:
* RISC-V Semihosting
* https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#include "qemu/osdep.h"
#include "qemu/timer.h"
#include "exec/gdbstub.h"
#include "gdbstub/syscalls.h"
#include "semihosting/semihost.h"
#include "semihosting/console.h"
#include "semihosting/common-semi.h"
#include "semihosting/guestfd.h"
#include "semihosting/syscalls.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "qemu/cutils.h"
#include "hw/core/loader.h"
#include "hw/core/boards.h"
#endif
#define TARGET_SYS_OPEN 0x01
#define TARGET_SYS_CLOSE 0x02
#define TARGET_SYS_WRITEC 0x03
#define TARGET_SYS_WRITE0 0x04
#define TARGET_SYS_WRITE 0x05
#define TARGET_SYS_READ 0x06
#define TARGET_SYS_READC 0x07
#define TARGET_SYS_ISERROR 0x08
#define TARGET_SYS_ISTTY 0x09
#define TARGET_SYS_SEEK 0x0a
#define TARGET_SYS_FLEN 0x0c
#define TARGET_SYS_TMPNAM 0x0d
#define TARGET_SYS_REMOVE 0x0e
#define TARGET_SYS_RENAME 0x0f
#define TARGET_SYS_CLOCK 0x10
#define TARGET_SYS_TIME 0x11
#define TARGET_SYS_SYSTEM 0x12
#define TARGET_SYS_ERRNO 0x13
#define TARGET_SYS_GET_CMDLINE 0x15
#define TARGET_SYS_HEAPINFO 0x16
#define TARGET_SYS_EXIT 0x18
#define TARGET_SYS_SYNCCACHE 0x19
#define TARGET_SYS_EXIT_EXTENDED 0x20
#define TARGET_SYS_ELAPSED 0x30
#define TARGET_SYS_TICKFREQ 0x31
/* ADP_Stopped_ApplicationExit is used for exit(0),
* anything else is implemented as exit(1) */
#define ADP_Stopped_ApplicationExit (0x20026)
#ifndef O_BINARY
#define O_BINARY 0
#endif
static int gdb_open_modeflags[12] = {
GDB_O_RDONLY,
GDB_O_RDONLY,
GDB_O_RDWR,
GDB_O_RDWR,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
};
/*
* For ARM semihosting, we have a separate structure for routing
* data for the console which is outside the guest fd address space.
*/
static GuestFD console_in_gf;
static GuestFD console_out_gf;
#ifndef CONFIG_USER_ONLY
/**
* common_semi_find_bases: find information about ram and heap base
*
* This function attempts to provide meaningful numbers for RAM and
* HEAP base addresses. The rambase is simply the lowest addressable
* RAM position. For the heapbase we ask the loader to scan the
* address space and the largest available gap by querying the "ROM"
* regions.
*
* Returns: a structure with the numbers we need.
*/
typedef struct LayoutInfo {
vaddr rambase;
size_t ramsize;
hwaddr heapbase;
hwaddr heaplimit;
} LayoutInfo;
static bool find_ram_cb(Int128 start, Int128 len, const MemoryRegion *mr,
hwaddr offset_in_region, void *opaque)
{
LayoutInfo *info = (LayoutInfo *) opaque;
uint64_t size = int128_get64(len);
if (!mr->ram || mr->readonly) {
return false;
}
if (size > info->ramsize) {
info->rambase = int128_get64(start);
info->ramsize = size;
}
/* search exhaustively for largest RAM */
return false;
}
static LayoutInfo common_semi_find_bases(CPUState *cs)
{
FlatView *fv;
LayoutInfo info = { 0, 0, 0, 0 };
RCU_READ_LOCK_GUARD();
fv = address_space_to_flatview(cs->as);
flatview_for_each_range(fv, find_ram_cb, &info);
/*
* If we have found the RAM lets iterate through the ROM blobs to
* work out the best place for the remainder of RAM and split it
* equally between stack and heap.
*/
if (info.rambase || info.ramsize > 0) {
RomGap gap = rom_find_largest_gap_between(info.rambase, info.ramsize);
info.heapbase = gap.base;
info.heaplimit = gap.base + gap.size;
}
return info;
}
#endif
#include "semihosting/common-semi.h"
/*
* Read the input value from the argument block; fail the semihosting
* call if the memory read fails. Eventually we could use a generic
* CPUState helper function here.
* Note that GET_ARG() handles memory access errors by jumping to
* do_fault, so must be used as the first thing done in handling a
* semihosting call, to avoid accidentally leaking allocated resources.
* SET_ARG(), since it unavoidably happens late, instead returns an
* error indication (0 on success, non-0 for error) which the caller
* should check.
*/
#define GET_ARG(n) do { \
if (is_64bit_semihosting(env)) { \
if (get_user_u64(arg ## n, args + (n) * 8)) { \
goto do_fault; \
} \
} else { \
if (get_user_u32(arg ## n, args + (n) * 4)) { \
goto do_fault; \
} \
} \
} while (0)
#define SET_ARG(n, val) \
(is_64bit_semihosting(env) ? \
put_user_u64(val, args + (n) * 8) : \
put_user_u32(val, args + (n) * 4))
/*
* The semihosting API has no concept of its errno being thread-safe,
* as the API design predates SMP CPUs and was intended as a simple
* real-hardware set of debug functionality. For QEMU, we make the
* errno be per-thread in linux-user mode; in system-mode it is a simple
* global, and we assume that the guest takes care of avoiding any races.
*/
#ifndef CONFIG_USER_ONLY
static uint64_t syscall_err;
#include "semihosting/uaccess.h"
#endif
static inline uint32_t get_swi_errno(CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
TaskState *ts = get_task_state(cs);
return ts->swi_errno;
#else
return syscall_err;
#endif
}
static void common_semi_cb(CPUState *cs, uint64_t ret, int err)
{
if (err) {
#ifdef CONFIG_USER_ONLY
TaskState *ts = get_task_state(cs);
ts->swi_errno = err;
#else
syscall_err = err;
#endif
}
common_semi_set_ret(cs, ret);
}
/*
* Use 0xdeadbeef as the return value when there isn't a defined
* return value for the call.
*/
static void common_semi_dead_cb(CPUState *cs, uint64_t ret, int err)
{
common_semi_set_ret(cs, 0xdeadbeef);
}
/*
* SYS_READ and SYS_WRITE always return the number of bytes not read/written.
* There is no error condition, other than returning the original length.
*/
static void common_semi_rw_cb(CPUState *cs, uint64_t ret, int err)
{
/* Recover the original length from the third argument. */
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
uint64_t args = common_semi_arg(cs, 1);
uint64_t arg2;
GET_ARG(2);
if (err) {
do_fault:
ret = 0; /* error: no bytes transmitted */
}
common_semi_set_ret(cs, arg2 - ret);
}
/*
* Convert from Posix ret+errno to Arm SYS_ISTTY return values.
* With gdbstub, err is only ever set for protocol errors to EIO.
*/
static void common_semi_istty_cb(CPUState *cs, uint64_t ret, int err)
{
if (err) {
ret = (err == ENOTTY ? 0 : -1);
}
common_semi_cb(cs, ret, err);
}
/*
* SYS_SEEK returns 0 on success, not the resulting offset.
*/
static void common_semi_seek_cb(CPUState *cs, uint64_t ret, int err)
{
if (!err) {
ret = 0;
}
common_semi_cb(cs, ret, err);
}
/*
* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
* is defined by GDB's remote protocol and is not target-specific.)
* We put this on the guest's stack just below SP.
*/
static uint64_t common_semi_flen_buf(CPUState *cs)
{
vaddr sp = common_semi_stack_bottom(cs);
return sp - 64;
}
static void
common_semi_flen_fstat_cb(CPUState *cs, uint64_t ret, int err)
{
if (!err) {
/* The size is always stored in big-endian order, extract the value. */
uint64_t size;
if (cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) +
offsetof(struct gdb_stat, gdb_st_size),
&size, 8, 0)) {
ret = -1, err = EFAULT;
} else {
ret = be64_to_cpu(size);
}
}
common_semi_cb(cs, ret, err);
}
static void
common_semi_readc_cb(CPUState *cs, uint64_t ret, int err)
{
if (!err) {
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
uint8_t ch;
if (get_user_u8(ch, common_semi_stack_bottom(cs) - 1)) {
ret = -1, err = EFAULT;
} else {
ret = ch;
}
}
common_semi_cb(cs, ret, err);
}
#define SHFB_MAGIC_0 0x53
#define SHFB_MAGIC_1 0x48
#define SHFB_MAGIC_2 0x46
#define SHFB_MAGIC_3 0x42
/* Feature bits reportable in feature byte 0 */
#define SH_EXT_EXIT_EXTENDED (1 << 0)
#define SH_EXT_STDOUT_STDERR (1 << 1)
static const uint8_t featurefile_data[] = {
SHFB_MAGIC_0,
SHFB_MAGIC_1,
SHFB_MAGIC_2,
SHFB_MAGIC_3,
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
bool semihosting_arm_compatible(void)
{
return true;
}
void semihosting_arm_compatible_init(void)
{
/* For ARM-compat, the console is in a separate namespace. */
if (use_gdb_syscalls()) {
console_in_gf.type = GuestFDGDB;
console_in_gf.hostfd = 0;
console_out_gf.type = GuestFDGDB;
console_out_gf.hostfd = 2;
} else {
console_in_gf.type = GuestFDConsole;
console_out_gf.type = GuestFDConsole;
}
}
/*
* Do a semihosting call.
*
* The specification always says that the "return register" either
* returns a specific value or is corrupted, so we don't need to
* report to our caller whether we are returning a value or trying to
* leave the register unchanged.
*/
void do_common_semihosting(CPUState *cs)
{
CPUArchState *env = cpu_env(cs);
uint64_t args;
uint64_t arg0, arg1, arg2, arg3;
uint64_t ul_ret;
char * s;
int nr;
int64_t elapsed;
nr = common_semi_arg(cs, 0) & 0xffffffffU;
args = common_semi_arg(cs, 1);
switch (nr) {
case TARGET_SYS_OPEN:
{
int ret, err = 0;
int hostfd;
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
s = lock_user_string(arg0);
if (!s) {
goto do_fault;
}
if (arg1 >= 12) {
unlock_user(s, arg0, 0);
common_semi_cb(cs, -1, EINVAL);
break;
}
if (strcmp(s, ":tt") == 0) {
/*
* We implement SH_EXT_STDOUT_STDERR, so:
* open for read == stdin
* open for write == stdout
* open for append == stderr
*/
if (arg1 < 4) {
hostfd = STDIN_FILENO;
} else if (arg1 < 8) {
hostfd = STDOUT_FILENO;
} else {
hostfd = STDERR_FILENO;
}
ret = alloc_guestfd();
associate_guestfd(ret, hostfd);
} else if (strcmp(s, ":semihosting-features") == 0) {
/* We must fail opens for modes other than 0 ('r') or 1 ('rb') */
if (arg1 != 0 && arg1 != 1) {
ret = -1;
err = EACCES;
} else {
ret = alloc_guestfd();
staticfile_guestfd(ret, featurefile_data,
sizeof(featurefile_data));
}
} else {
unlock_user(s, arg0, 0);
semihost_sys_open(cs, common_semi_cb, arg0, arg2 + 1,
gdb_open_modeflags[arg1], 0644);
break;
}
unlock_user(s, arg0, 0);
common_semi_cb(cs, ret, err);
break;
}
case TARGET_SYS_CLOSE:
GET_ARG(0);
semihost_sys_close(cs, common_semi_cb, arg0);
break;
case TARGET_SYS_WRITEC:
/*
* FIXME: the byte to be written is in a uint64_t slot,
* which means this is wrong for a big-endian guest.
*/
semihost_sys_write_gf(cs, common_semi_dead_cb,
&console_out_gf, args, 1);
break;
case TARGET_SYS_WRITE0:
{
ssize_t len = target_strlen(args);
if (len < 0) {
common_semi_dead_cb(cs, -1, EFAULT);
} else {
semihost_sys_write_gf(cs, common_semi_dead_cb,
&console_out_gf, args, len);
}
}
break;
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
semihost_sys_write(cs, common_semi_rw_cb, arg0, arg1, arg2);
break;
case TARGET_SYS_READ:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
semihost_sys_read(cs, common_semi_rw_cb, arg0, arg1, arg2);
break;
case TARGET_SYS_READC:
semihost_sys_read_gf(cs, common_semi_readc_cb, &console_in_gf,
common_semi_stack_bottom(cs) - 1, 1);
break;
case TARGET_SYS_ISERROR:
{
GET_ARG(0);
bool ret = is_64bit_semihosting(env) ?
(int64_t)arg0 < 0 : (int32_t)arg0 < 0;
common_semi_set_ret(cs, ret);
break;
}
case TARGET_SYS_ISTTY:
GET_ARG(0);
semihost_sys_isatty(cs, common_semi_istty_cb, arg0);
break;
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
semihost_sys_lseek(cs, common_semi_seek_cb, arg0, arg1, GDB_SEEK_SET);
break;
case TARGET_SYS_FLEN:
GET_ARG(0);
semihost_sys_flen(cs, common_semi_flen_fstat_cb, common_semi_cb,
arg0, common_semi_flen_buf(cs));
break;
case TARGET_SYS_TMPNAM:
{
int len;
char *p;
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
len = asprintf(&s, "%s/qemu-%x%02x", g_get_tmp_dir(),
getpid(), (int)arg1 & 0xff);
if (len < 0) {
common_semi_set_ret(cs, -1);
break;
}
/* Allow for trailing NUL */
len++;
/* Make sure there's enough space in the buffer */
if (len > arg2) {
free(s);
common_semi_set_ret(cs, -1);
break;
}
p = lock_user(VERIFY_WRITE, arg0, len, 0);
if (!p) {
free(s);
goto do_fault;
}
memcpy(p, s, len);
unlock_user(p, arg0, len);
free(s);
common_semi_set_ret(cs, 0);
break;
}
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
semihost_sys_remove(cs, common_semi_cb, arg0, arg1 + 1);
break;
case TARGET_SYS_RENAME:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
semihost_sys_rename(cs, common_semi_cb, arg0, arg1 + 1, arg2, arg3 + 1);
break;
case TARGET_SYS_CLOCK:
common_semi_set_ret(cs, clock() / (CLOCKS_PER_SEC / 100));
break;
case TARGET_SYS_TIME:
ul_ret = time(NULL);
common_semi_cb(cs, ul_ret, ul_ret == -1 ? errno : 0);
break;
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
semihost_sys_system(cs, common_semi_cb, arg0, arg1 + 1);
break;
case TARGET_SYS_ERRNO:
common_semi_set_ret(cs, get_swi_errno(cs));
break;
case TARGET_SYS_GET_CMDLINE:
{
/* Build a command-line from the original argv.
*
* The inputs are:
* * arg0, pointer to a buffer of at least the size
* specified in arg1.
* * arg1, size of the buffer pointed to by arg0 in
* bytes.
*
* The outputs are:
* * arg0, pointer to null-terminated string of the
* command line.
* * arg1, length of the string pointed to by arg0.
*/
char *output_buffer;
size_t input_size;
size_t output_size;
int status = 0;
#if !defined(CONFIG_USER_ONLY)
const char *cmdline;
#else
TaskState *ts = get_task_state(cs);
#endif
GET_ARG(0);
GET_ARG(1);
input_size = arg1;
/* Compute the size of the output string. */
#if !defined(CONFIG_USER_ONLY)
cmdline = semihosting_get_cmdline();
if (cmdline == NULL) {
cmdline = ""; /* Default to an empty line. */
}
output_size = strlen(cmdline) + 1; /* Count terminating 0. */
#else
unsigned int i;
output_size = ts->info->env_strings - ts->info->arg_strings;
if (!output_size) {
/*
* We special-case the "empty command line" case (argc==0).
* Just provide the terminating 0.
*/
output_size = 1;
}
#endif
if (output_size > input_size) {
/* Not enough space to store command-line arguments. */
common_semi_cb(cs, -1, E2BIG);
break;
}
/* Adjust the command-line length. */
if (SET_ARG(1, output_size - 1)) {
/* Couldn't write back to argument block */
goto do_fault;
}
/* Lock the buffer on the ARM side. */
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
if (!output_buffer) {
goto do_fault;
}
/* Copy the command-line arguments. */
#if !defined(CONFIG_USER_ONLY)
pstrcpy(output_buffer, output_size, cmdline);
#else
if (output_size == 1) {
/* Empty command-line. */
output_buffer[0] = '\0';
goto out;
}
if (copy_from_user(output_buffer, ts->info->arg_strings,
output_size)) {
unlock_user(output_buffer, arg0, 0);
goto do_fault;
}
/* Separate arguments by white spaces. */
for (i = 0; i < output_size - 1; i++) {
if (output_buffer[i] == 0) {
output_buffer[i] = ' ';
}
}
out:
#endif
/* Unlock the buffer on the ARM side. */
unlock_user(output_buffer, arg0, output_size);
common_semi_cb(cs, status, 0);
}
break;
case TARGET_SYS_HEAPINFO:
{
uint64_t retvals[4];
int i;
#ifdef CONFIG_USER_ONLY
TaskState *ts = get_task_state(cs);
static abi_ulong heapbase, heaplimit;
#else
LayoutInfo info = common_semi_find_bases(cs);
#endif
GET_ARG(0);
#ifdef CONFIG_USER_ONLY
/*
* Some C libraries assume the heap immediately follows .bss, so
* allocate it using sbrk.
*/
if (!heaplimit) {
heapbase = do_brk(0);
/* Try a big heap, and reduce the size if that fails. */
for (abi_ulong size = COMMON_SEMI_HEAP_SIZE; ; size >>= 1) {
abi_ulong limit = heapbase + size;
abi_ulong ret = do_brk(limit);
if (ret >= limit) {
heaplimit = limit;
break;
}
}
}
retvals[0] = heapbase;
retvals[1] = heaplimit;
/*
* Note that semihosting is *not* thread aware.
* Always return the stack base of the main thread.
*/
retvals[2] = ts->info->start_stack;
retvals[3] = 0; /* Stack limit. */
#else
retvals[0] = info.heapbase; /* Heap Base */
retvals[1] = info.heaplimit; /* Heap Limit */
retvals[2] = info.heaplimit; /* Stack base */
retvals[3] = info.heapbase; /* Stack limit. */
#endif
for (i = 0; i < ARRAY_SIZE(retvals); i++) {
bool fail;
if (is_64bit_semihosting(env)) {
fail = put_user_u64(retvals[i], arg0 + i * 8);
} else {
fail = put_user_u32(retvals[i], arg0 + i * 4);
}
if (fail) {
/* Couldn't write back to argument block */
goto do_fault;
}
}
common_semi_set_ret(cs, 0);
}
break;
case TARGET_SYS_EXIT:
case TARGET_SYS_EXIT_EXTENDED:
{
uint32_t ret;
if (nr == TARGET_SYS_EXIT_EXTENDED ||
common_semi_sys_exit_is_extended(cs)) {
/*
* The A64 version of SYS_EXIT takes a parameter block,
* so the application-exit type can return a subcode which
* is the exit status code from the application.
* SYS_EXIT_EXTENDED is an a new-in-v2.0 optional function
* which allows A32/T32 guests to also provide a status code.
*/
GET_ARG(0);
GET_ARG(1);
if (arg0 == ADP_Stopped_ApplicationExit) {
ret = arg1;
} else {
ret = 1;
}
} else {
/*
* The A32/T32 version of SYS_EXIT specifies only
* Stopped_ApplicationExit as normal exit, but does not
* allow the guest to specify the exit status code.
* Everything else is considered an error.
*/
ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
}
gdb_exit(ret);
exit(ret);
}
case TARGET_SYS_ELAPSED:
elapsed = get_clock() - clock_start;
if (is_64bit_semihosting(env)) {
if (SET_ARG(0, elapsed)) {
goto do_fault;
}
} else {
if (SET_ARG(0, (uint32_t) elapsed) ||
SET_ARG(1, (uint32_t) (elapsed >> 32))) {
goto do_fault;
}
}
common_semi_set_ret(cs, 0);
break;
case TARGET_SYS_TICKFREQ:
/* qemu always uses nsec */
common_semi_set_ret(cs, 1000000000);
break;
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified
* virtual address range. This is a nop for us since we don't
* implement caches. This is only present on A64.
*/
if (common_semi_has_synccache(env)) {
common_semi_set_ret(cs, 0);
break;
}
/* fall through */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
cpu_dump_state(cs, stderr, 0);
abort();
do_fault:
common_semi_cb(cs, -1, EFAULT);
break;
}
}
semihosting/config.c
+191
View File
@@ -0,0 +1,191 @@
/*
* Semihosting configuration
*
* Copyright (c) 2015 Imagination Technologies
* Copyright (c) 2019 Linaro Ltd
*
* This controls the configuration of semihosting for all guest
* targets that support it. Architecture specific handling is handled
* in target/HW/HW-semi.c
*
* Semihosting is slightly strange in that it is also supported by some
* linux-user targets. However in that use case no configuration of
* the outputs and command lines is supported.
*
* The config module is common to all system targets however as vl.c
* needs to link against the helpers.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "semihosting/semihost.h"
#include "chardev/char.h"
QemuOptsList qemu_semihosting_config_opts = {
.name = "semihosting-config",
.merge_lists = true,
.implied_opt_name = "enable",
.head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head),
.desc = {
{
.name = "enable",
.type = QEMU_OPT_BOOL,
}, {
.name = "userspace",
.type = QEMU_OPT_BOOL,
}, {
.name = "target",
.type = QEMU_OPT_STRING,
}, {
.name = "chardev",
.type = QEMU_OPT_STRING,
}, {
.name = "arg",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
typedef struct SemihostingConfig {
bool enabled;
bool userspace_enabled;
SemihostingTarget target;
char **argv;
int argc;
const char *cmdline; /* concatenated argv */
} SemihostingConfig;
static SemihostingConfig semihosting;
static const char *semihost_chardev;
bool semihosting_enabled(bool is_user)
{
return semihosting.enabled && (!is_user || semihosting.userspace_enabled);
}
SemihostingTarget semihosting_get_target(void)
{
return semihosting.target;
}
const char *semihosting_get_arg(int i)
{
if (i >= semihosting.argc) {
return NULL;
}
return semihosting.argv[i];
}
int semihosting_get_argc(void)
{
return semihosting.argc;
}
const char *semihosting_get_cmdline(void)
{
if (semihosting.cmdline == NULL && semihosting.argc > 0) {
semihosting.cmdline = g_strjoinv(" ", (gchar **)semihosting.argv);
}
return semihosting.cmdline;
}
static int add_semihosting_arg(void *opaque,
const char *name, const char *val,
Error **errp)
{
SemihostingConfig *s = opaque;
if (strcmp(name, "arg") == 0) {
s->argc++;
/* one extra element as g_strjoinv() expects NULL-terminated array */
s->argv = g_renew(char *, s->argv, s->argc + 1);
s->argv[s->argc - 1] = g_strdup(val);
s->argv[s->argc] = NULL;
}
return 0;
}
/* Use strings passed via -kernel/-append to initialize semihosting.argv[] */
void semihosting_arg_fallback(const char *file, const char *cmd)
{
char *cmd_token;
g_autofree char *cmd_dup = g_strdup(cmd);
/* argv[0] */
add_semihosting_arg(&semihosting, "arg", file, NULL);
/* split -append and initialize argv[1..n] */
cmd_token = strtok(cmd_dup, " ");
while (cmd_token) {
add_semihosting_arg(&semihosting, "arg", cmd_token, NULL);
cmd_token = strtok(NULL, " ");
}
}
void qemu_semihosting_enable(void)
{
semihosting.enabled = true;
semihosting.target = SEMIHOSTING_TARGET_AUTO;
}
int qemu_semihosting_config_options(const char *optstr)
{
QemuOptsList *opt_list = qemu_find_opts("semihosting-config");
QemuOpts *opts = qemu_opts_parse_noisily(opt_list, optstr, false);
semihosting.enabled = true;
if (opts != NULL) {
semihosting.enabled = qemu_opt_get_bool(opts, "enable",
true);
semihosting.userspace_enabled = qemu_opt_get_bool(opts, "userspace",
false);
const char *target = qemu_opt_get(opts, "target");
/* setup of chardev is deferred until they are initialised */
semihost_chardev = qemu_opt_get(opts, "chardev");
if (target != NULL) {
if (strcmp("native", target) == 0) {
semihosting.target = SEMIHOSTING_TARGET_NATIVE;
} else if (strcmp("gdb", target) == 0) {
semihosting.target = SEMIHOSTING_TARGET_GDB;
} else if (strcmp("auto", target) == 0) {
semihosting.target = SEMIHOSTING_TARGET_AUTO;
} else {
error_report("unsupported semihosting-config %s",
optstr);
return 1;
}
} else {
semihosting.target = SEMIHOSTING_TARGET_AUTO;
}
/* Set semihosting argument count and vector */
qemu_opt_foreach(opts, add_semihosting_arg,
&semihosting, NULL);
} else {
error_report("unsupported semihosting-config %s", optstr);
return 1;
}
return 0;
}
/* We had to defer this until chardevs were created */
void qemu_semihosting_chardev_init(void)
{
Chardev *chr = NULL;
if (semihost_chardev) {
chr = qemu_chr_find(semihost_chardev);
if (chr == NULL) {
error_report("semihosting chardev '%s' not found",
semihost_chardev);
exit(1);
}
}
qemu_semihosting_console_init(chr);
}
semihosting/console.c
+135
View File
@@ -0,0 +1,135 @@
/*
* Semihosting Console Support
*
* Copyright (c) 2015 Imagination Technologies
* Copyright (c) 2019 Linaro Ltd
*
* This provides support for outputting to a semihosting console.
*
* While most semihosting implementations support reading and writing
* to arbitrary file descriptors we treat the console as something
* specifically for debugging interaction. This means messages can be
* re-directed to gdb (if currently being used to debug) or even
* re-directed elsewhere.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "semihosting/semihost.h"
#include "semihosting/console.h"
#include "accel/tcg/cpu-loop.h"
#include "exec/cpu-common.h"
#include "exec/gdbstub.h"
#include "qemu/log.h"
#include "chardev/char.h"
#include "chardev/char-fe.h"
#include "qemu/main-loop.h"
#include "qapi/error.h"
#include "qemu/fifo8.h"
#include "hw/core/cpu.h"
/* Access to this structure is protected by the BQL */
typedef struct SemihostingConsole {
CharFrontend frontend;
Chardev *chr;
GSList *sleeping_cpus;
bool got;
Fifo8 fifo;
} SemihostingConsole;
static SemihostingConsole console;
#define FIFO_SIZE 1024
static int console_can_read(void *opaque)
{
SemihostingConsole *c = opaque;
g_assert(bql_locked());
return (int)fifo8_num_free(&c->fifo);
}
static void console_wake_up(gpointer data, gpointer user_data)
{
CPUState *cs = (CPUState *) data;
/* cpu_handle_halt won't know we have work so just unbung here */
cs->halted = 0;
qemu_cpu_kick(cs);
}
static void console_read(void *opaque, const uint8_t *buf, int size)
{
SemihostingConsole *c = opaque;
g_assert(bql_locked());
while (size-- && !fifo8_is_full(&c->fifo)) {
fifo8_push(&c->fifo, *buf++);
}
g_slist_foreach(c->sleeping_cpus, console_wake_up, NULL);
c->sleeping_cpus = NULL;
}
bool qemu_semihosting_console_ready(void)
{
SemihostingConsole *c = &console;
g_assert(bql_locked());
return !fifo8_is_empty(&c->fifo);
}
void qemu_semihosting_console_block_until_ready(CPUState *cs)
{
SemihostingConsole *c = &console;
g_assert(bql_locked());
/* Block if the fifo is completely empty. */
if (fifo8_is_empty(&c->fifo)) {
c->sleeping_cpus = g_slist_prepend(c->sleeping_cpus, cs);
cs->halted = 1;
cs->exception_index = EXCP_HALTED;
cpu_loop_exit(cs);
/* never returns */
}
}
int qemu_semihosting_console_read(CPUState *cs, void *buf, int len)
{
SemihostingConsole *c = &console;
int ret = 0;
qemu_semihosting_console_block_until_ready(cs);
/* Read until buffer full or fifo exhausted. */
do {
*(char *)(buf + ret) = fifo8_pop(&c->fifo);
ret++;
} while (ret < len && !fifo8_is_empty(&c->fifo));
return ret;
}
int qemu_semihosting_console_write(void *buf, int len)
{
if (console.chr) {
int r = qemu_chr_write_all(console.chr, (uint8_t *)buf, len);
return r < 0 ? 0 : r;
} else {
return fwrite(buf, 1, len, stderr);
}
}
void qemu_semihosting_console_init(Chardev *chr)
{
console.chr = chr;
if (chr) {
fifo8_create(&console.fifo, FIFO_SIZE);
qemu_chr_fe_init(&console.frontend, chr, &error_abort);
qemu_chr_fe_set_handlers(&console.frontend,
console_can_read,
console_read,
NULL, NULL, &console,
NULL, true);
}
qemu_semihosting_guestfd_init();
}
semihosting/guestfd.c
+141
View File
@@ -0,0 +1,141 @@
/*
* Hosted file support for semihosting syscalls.
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
* Copyright © 2020 by Keith Packard <[email protected]>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "gdbstub/syscalls.h"
#include "semihosting/semihost.h"
#include "semihosting/guestfd.h"
static GArray *guestfd_array;
void qemu_semihosting_guestfd_init(void)
{
/* New entries zero-initialized, i.e. type GuestFDUnused */
guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD));
if (semihosting_arm_compatible()) {
semihosting_arm_compatible_init();
return;
}
/* Out of ARM, the stdio file descriptors apply. */
guestfd_array = g_array_set_size(guestfd_array, 3);
#ifndef CONFIG_USER_ONLY
if (!use_gdb_syscalls()) {
GuestFD *gf = &g_array_index(guestfd_array, GuestFD, 0);
gf[0].type = GuestFDConsole;
gf[1].type = GuestFDConsole;
gf[2].type = GuestFDConsole;
return;
}
#endif
associate_guestfd(0, 0);
associate_guestfd(1, 1);
associate_guestfd(2, 2);
}
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
* This is a fairly simplistic implementation because we don't
* expect that most semihosting guest programs will make very
* heavy use of opening and closing fds.
*/
int alloc_guestfd(void)
{
guint i;
/* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */
for (i = 1; i < guestfd_array->len; i++) {
GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i);
if (gf->type == GuestFDUnused) {
return i;
}
}
/* All elements already in use: expand the array */
g_array_set_size(guestfd_array, i + 1);
return i;
}
static void do_dealloc_guestfd(GuestFD *gf)
{
gf->type = GuestFDUnused;
}
/*
* Look up the guestfd in the data structure; return NULL
* for out of bounds, but don't check whether the slot is unused.
* This is used internally by the other guestfd functions.
*/
static GuestFD *do_get_guestfd(int guestfd)
{
if (guestfd < 0 || guestfd >= guestfd_array->len) {
return NULL;
}
return &g_array_index(guestfd_array, GuestFD, guestfd);
}
/*
* Given a guest file descriptor, get the associated struct.
* If the fd is not valid, return NULL. This is the function
* used by the various semihosting calls to validate a handle
* from the guest.
* Note: calling alloc_guestfd() or dealloc_guestfd() will
* invalidate any GuestFD* obtained by calling this function.
*/
GuestFD *get_guestfd(int guestfd)
{
GuestFD *gf = do_get_guestfd(guestfd);
if (!gf || gf->type == GuestFDUnused) {
return NULL;
}
return gf;
}
/*
* Associate the specified guest fd (which must have been
* allocated via alloc_fd() and not previously used) with
* the specified host/gdb fd.
*/
void associate_guestfd(int guestfd, int hostfd)
{
GuestFD *gf = do_get_guestfd(guestfd);
assert(gf);
gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost;
gf->hostfd = hostfd;
}
void staticfile_guestfd(int guestfd, const uint8_t *data, size_t len)
{
GuestFD *gf = do_get_guestfd(guestfd);
assert(gf);
gf->type = GuestFDStatic;
gf->staticfile.data = data;
gf->staticfile.len = len;
gf->staticfile.off = 0;
}
/*
* Deallocate the specified guest file descriptor. This doesn't
* close the host fd, it merely undoes the work of alloc_fd().
*/
void dealloc_guestfd(int guestfd)
{
GuestFD *gf = do_get_guestfd(guestfd);
assert(gf);
do_dealloc_guestfd(gf);
}
semihosting/meson.build
+22
View File
@@ -0,0 +1,22 @@
stub_ss.add(files('stubs-all.c'))
user_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
'user.c',
'guestfd.c'))
system_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
'config.c',
'console.c',
'guestfd.c',
'uaccess.c',
'syscalls.c',
))
stub_ss.add(files(
'stubs-system.c',
))
system_ss.add(when: 'CONFIG_ARM_COMPATIBLE_SEMIHOSTING',
if_true: files('arm-compat-semi.c'))
stub_ss.add(files('arm-compat-semi-stub.c'))
specific_ss.add(when: ['CONFIG_SEMIHOSTING', 'CONFIG_USER_ONLY'],
if_true: files('syscalls.c'))
specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING', 'CONFIG_USER_ONLY'],
if_true: files('arm-compat-semi.c'))
semihosting/stubs-all.c
+23
View File
@@ -0,0 +1,23 @@
/*
* Semihosting Stubs for all targets
*
* Copyright (c) 2023 Linaro Ltd
*
* Stubs for all targets that don't actually do semihosting.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "semihosting/semihost.h"
/* Queries to config status default to off */
bool semihosting_enabled(bool is_user)
{
return false;
}
SemihostingTarget semihosting_get_target(void)
{
return SEMIHOSTING_TARGET_AUTO;
}
semihosting/stubs-system.c
+59
View File
@@ -0,0 +1,59 @@
/*
* Semihosting Stubs for system emulation
*
* Copyright (c) 2019 Linaro Ltd
*
* Stubs for system targets that don't actually do semihosting.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/option.h"
#include "qemu/error-report.h"
#include "semihosting/semihost.h"
/* Empty config */
QemuOptsList qemu_semihosting_config_opts = {
.name = "",
.head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head),
.desc = {
{ /* end of list */ }
},
};
/*
* All the rest are empty subs. We could g_assert_not_reached() but
* that adds extra weight to the final binary. Waste not want not.
*/
void qemu_semihosting_enable(void)
{
}
int qemu_semihosting_config_options(const char *optstr)
{
return 1;
}
const char *semihosting_get_arg(int i)
{
return NULL;
}
int semihosting_get_argc(void)
{
return 0;
}
const char *semihosting_get_cmdline(void)
{
return NULL;
}
void semihosting_arg_fallback(const char *file, const char *cmd)
{
}
void qemu_semihosting_chardev_init(void)
{
}
semihosting/syscalls.c
+984
View File
@@ -0,0 +1,984 @@
/*
* Syscall implementations for semihosting.
*
* Copyright (c) 2022 Linaro
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "gdbstub/syscalls.h"
#include "semihosting/guestfd.h"
#include "semihosting/syscalls.h"
#include "semihosting/console.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#else
#include "semihosting/uaccess.h"
#endif
/*
* Validate or compute the length of the string (including terminator).
*/
static int validate_strlen(CPUState *cs, vaddr str, uint64_t tlen)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char c;
if (tlen == 0) {
ssize_t slen = target_strlen(str);
if (slen < 0) {
return -EFAULT;
}
if (slen >= INT32_MAX) {
return -ENAMETOOLONG;
}
return slen + 1;
}
if (tlen > INT32_MAX) {
return -ENAMETOOLONG;
}
if (get_user_u8(c, str + tlen - 1)) {
return -EFAULT;
}
if (c != 0) {
return -EINVAL;
}
return tlen;
}
static int validate_lock_user_string(char **pstr, CPUState *cs,
vaddr tstr, uint64_t tlen)
{
int ret = validate_strlen(cs, tstr, tlen);
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char *str = NULL;
if (ret > 0) {
str = lock_user(VERIFY_READ, tstr, ret, true);
ret = str ? 0 : -EFAULT;
}
*pstr = str;
return ret;
}
/*
* TODO: Note that gdb always stores the stat structure big-endian.
* So far, that's ok, as the only two targets using this are also
* big-endian. Until we do something with gdb, also produce the
* same big-endian result from the host.
*/
static int copy_stat_to_user(CPUState *cs, vaddr addr,
const struct stat *s)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
struct gdb_stat *p;
if (s->st_dev != (uint32_t)s->st_dev ||
s->st_ino != (uint32_t)s->st_ino) {
return -EOVERFLOW;
}
p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0);
if (!p) {
return -EFAULT;
}
p->gdb_st_dev = cpu_to_be32(s->st_dev);
p->gdb_st_ino = cpu_to_be32(s->st_ino);
p->gdb_st_mode = cpu_to_be32(s->st_mode);
p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
p->gdb_st_uid = cpu_to_be32(s->st_uid);
p->gdb_st_gid = cpu_to_be32(s->st_gid);
p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
p->gdb_st_size = cpu_to_be64(s->st_size);
#ifdef _WIN32
/* Windows stat is missing some fields. */
p->gdb_st_blksize = 0;
p->gdb_st_blocks = 0;
#else
p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
#endif
p->gdb_st_atime = cpu_to_be32(s->st_atime);
p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
unlock_user(p, addr, sizeof(struct gdb_stat));
return 0;
}
/*
* GDB semihosting syscall implementations.
*/
static gdb_syscall_complete_cb gdb_open_complete;
static void gdb_open_cb(CPUState *cs, uint64_t ret, int err)
{
if (!err) {
int guestfd = alloc_guestfd();
associate_guestfd(guestfd, ret);
ret = guestfd;
}
gdb_open_complete(cs, ret, err);
}
static void gdb_open(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len,
int gdb_flags, int mode)
{
int len = validate_strlen(cs, fname, fname_len);
if (len < 0) {
complete(cs, -1, -len);
return;
}
gdb_open_complete = complete;
gdb_do_syscall(gdb_open_cb, "open,%s,%x,%x",
(vaddr)fname, (uint32_t)len,
(uint32_t)gdb_flags, (uint32_t)mode);
}
static void gdb_close(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
gdb_do_syscall(complete, "close,%x", (uint32_t)gf->hostfd);
}
static void gdb_read(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
gdb_do_syscall(complete, "read,%x,%lx,%lx",
(uint32_t)gf->hostfd, (vaddr)buf, (uint64_t)len);
}
static void gdb_write(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
gdb_do_syscall(complete, "write,%x,%lx,%lx",
(uint32_t)gf->hostfd, (vaddr)buf, (uint64_t)len);
}
static void gdb_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, int64_t off, int gdb_whence)
{
gdb_do_syscall(complete, "lseek,%x,%lx,%x",
(uint32_t)gf->hostfd, off, (uint32_t)gdb_whence);
}
static void gdb_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
gdb_do_syscall(complete, "isatty,%x", (uint32_t)gf->hostfd);
}
static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr addr)
{
gdb_do_syscall(complete, "fstat,%x,%lx",
(uint32_t)gf->hostfd, (vaddr)addr);
}
static void gdb_stat(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len,
vaddr addr)
{
int len = validate_strlen(cs, fname, fname_len);
if (len < 0) {
complete(cs, -1, -len);
return;
}
gdb_do_syscall(complete, "stat,%s,%lx",
(vaddr)fname, (uint32_t)len, (vaddr)addr);
}
static void gdb_remove(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len)
{
int len = validate_strlen(cs, fname, fname_len);
if (len < 0) {
complete(cs, -1, -len);
return;
}
gdb_do_syscall(complete, "unlink,%s", (vaddr)fname, (uint32_t)len);
}
static void gdb_rename(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr oname, uint64_t oname_len,
vaddr nname, uint64_t nname_len)
{
int olen, nlen;
olen = validate_strlen(cs, oname, oname_len);
if (olen < 0) {
complete(cs, -1, -olen);
return;
}
nlen = validate_strlen(cs, nname, nname_len);
if (nlen < 0) {
complete(cs, -1, -nlen);
return;
}
gdb_do_syscall(complete, "rename,%s,%s",
(vaddr)oname, (uint32_t)olen,
(vaddr)nname, (uint32_t)nlen);
}
static void gdb_system(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr cmd, uint64_t cmd_len)
{
int len = validate_strlen(cs, cmd, cmd_len);
if (len < 0) {
complete(cs, -1, -len);
return;
}
gdb_do_syscall(complete, "system,%s", (vaddr)cmd, (uint32_t)len);
}
static void gdb_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr tv_addr, vaddr tz_addr)
{
gdb_do_syscall(complete, "gettimeofday,%lx,%lx",
(vaddr)tv_addr, (vaddr)tz_addr);
}
/*
* Host semihosting syscall implementations.
*/
static void host_open(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len,
int gdb_flags, int mode)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char *p;
int ret, host_flags = O_BINARY;
ret = validate_lock_user_string(&p, cs, fname, fname_len);
if (ret < 0) {
complete(cs, -1, -ret);
return;
}
if (gdb_flags & GDB_O_WRONLY) {
host_flags |= O_WRONLY;
} else if (gdb_flags & GDB_O_RDWR) {
host_flags |= O_RDWR;
} else {
host_flags |= O_RDONLY;
}
if (gdb_flags & GDB_O_CREAT) {
host_flags |= O_CREAT;
}
if (gdb_flags & GDB_O_TRUNC) {
host_flags |= O_TRUNC;
}
if (gdb_flags & GDB_O_EXCL) {
host_flags |= O_EXCL;
}
ret = open(p, host_flags, mode);
if (ret < 0) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: failed to open %s\n", __func__, p);
complete(cs, -1, errno);
} else {
int guestfd = alloc_guestfd();
associate_guestfd(guestfd, ret);
complete(cs, guestfd, 0);
}
unlock_user(p, fname, 0);
}
static void host_close(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
/*
* Only close the underlying host fd if it's one we opened on behalf
* of the guest in SYS_OPEN.
*/
if (gf->hostfd != STDIN_FILENO &&
gf->hostfd != STDOUT_FILENO &&
gf->hostfd != STDERR_FILENO &&
close(gf->hostfd) < 0) {
complete(cs, -1, errno);
} else {
complete(cs, 0, 0);
}
}
static void host_read(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
void *ptr = lock_user(VERIFY_WRITE, buf, len, 0);
ssize_t ret;
if (!ptr) {
complete(cs, -1, EFAULT);
return;
}
ret = RETRY_ON_EINTR(read(gf->hostfd, ptr, len));
if (ret == -1) {
unlock_user(ptr, buf, 0);
complete(cs, -1, errno);
} else {
unlock_user(ptr, buf, ret);
complete(cs, ret, 0);
}
}
static void host_write(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
void *ptr = lock_user(VERIFY_READ, buf, len, 1);
ssize_t ret;
if (!ptr) {
complete(cs, -1, EFAULT);
return;
}
ret = write(gf->hostfd, ptr, len);
unlock_user(ptr, buf, 0);
complete(cs, ret, ret == -1 ? errno : 0);
}
static void host_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, int64_t off, int whence)
{
/* So far, all hosts use the same values. */
QEMU_BUILD_BUG_ON(GDB_SEEK_SET != SEEK_SET);
QEMU_BUILD_BUG_ON(GDB_SEEK_CUR != SEEK_CUR);
QEMU_BUILD_BUG_ON(GDB_SEEK_END != SEEK_END);
off_t ret = off;
int err = 0;
if (ret == off) {
ret = lseek(gf->hostfd, ret, whence);
if (ret == -1) {
err = errno;
}
} else {
ret = -1;
err = EINVAL;
}
complete(cs, ret, err);
}
static void host_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
int ret = isatty(gf->hostfd);
complete(cs, ret, ret ? 0 : errno);
}
static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
struct stat buf;
if (fstat(gf->hostfd, &buf) < 0) {
complete(cs, -1, errno);
} else {
complete(cs, buf.st_size, 0);
}
}
static void host_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr addr)
{
struct stat buf;
int ret;
ret = fstat(gf->hostfd, &buf);
if (ret) {
complete(cs, -1, errno);
return;
}
ret = copy_stat_to_user(cs, addr, &buf);
complete(cs, ret ? -1 : 0, ret ? -ret : 0);
}
static void host_stat(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len,
vaddr addr)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
struct stat buf;
char *name;
int ret, err;
ret = validate_lock_user_string(&name, cs, fname, fname_len);
if (ret < 0) {
complete(cs, -1, -ret);
return;
}
ret = stat(name, &buf);
if (ret) {
err = errno;
} else {
ret = copy_stat_to_user(cs, addr, &buf);
err = 0;
if (ret < 0) {
err = -ret;
ret = -1;
}
}
unlock_user(name, fname, 0);
complete(cs, ret, err);
}
static void host_remove(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char *p;
int ret;
ret = validate_lock_user_string(&p, cs, fname, fname_len);
if (ret < 0) {
complete(cs, -1, -ret);
return;
}
ret = remove(p);
unlock_user(p, fname, 0);
complete(cs, ret, ret ? errno : 0);
}
static void host_rename(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr oname, uint64_t oname_len,
vaddr nname, uint64_t nname_len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char *ostr, *nstr;
int ret;
ret = validate_lock_user_string(&ostr, cs, oname, oname_len);
if (ret < 0) {
complete(cs, -1, -ret);
return;
}
ret = validate_lock_user_string(&nstr, cs, nname, nname_len);
if (ret < 0) {
unlock_user(ostr, oname, 0);
complete(cs, -1, -ret);
return;
}
ret = rename(ostr, nstr);
unlock_user(ostr, oname, 0);
unlock_user(nstr, nname, 0);
complete(cs, ret, ret ? errno : 0);
}
static void host_system(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr cmd, uint64_t cmd_len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char *p;
int ret;
ret = validate_lock_user_string(&p, cs, cmd, cmd_len);
if (ret < 0) {
complete(cs, -1, -ret);
return;
}
ret = system(p);
unlock_user(p, cmd, 0);
complete(cs, ret, ret == -1 ? errno : 0);
}
static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr tv_addr, vaddr tz_addr)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
struct gdb_timeval *p;
int64_t rt;
/* GDB fails on non-null TZ, so be consistent. */
if (tz_addr != 0) {
complete(cs, -1, EINVAL);
return;
}
p = lock_user(VERIFY_WRITE, tv_addr, sizeof(struct gdb_timeval), 0);
if (!p) {
complete(cs, -1, EFAULT);
return;
}
/* TODO: Like stat, gdb always produces big-endian results; match it. */
rt = g_get_real_time();
p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC);
p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC);
unlock_user(p, tv_addr, sizeof(struct gdb_timeval));
}
#ifndef CONFIG_USER_ONLY
static void host_poll_one(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, GIOCondition cond, int timeout)
{
/*
* Since this is only used by xtensa in system mode, and stdio is
* handled through GuestFDConsole, and there are no semihosting
* system calls for sockets and the like, that means this descriptor
* must be a normal file. Normal files never block and are thus
* always ready.
*/
complete(cs, cond & (G_IO_IN | G_IO_OUT), 0);
}
#endif
/*
* Static file semihosting syscall implementations.
*/
static void staticfile_read(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
uint64_t rest = gf->staticfile.len - gf->staticfile.off;
void *ptr;
if (len > rest) {
len = rest;
}
ptr = lock_user(VERIFY_WRITE, buf, len, 0);
if (!ptr) {
complete(cs, -1, EFAULT);
return;
}
memcpy(ptr, gf->staticfile.data + gf->staticfile.off, len);
gf->staticfile.off += len;
unlock_user(ptr, buf, len);
complete(cs, len, 0);
}
static void staticfile_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, int64_t off, int gdb_whence)
{
int64_t ret;
switch (gdb_whence) {
case GDB_SEEK_SET:
ret = off;
break;
case GDB_SEEK_CUR:
ret = gf->staticfile.off + off;
break;
case GDB_SEEK_END:
ret = gf->staticfile.len + off;
break;
default:
ret = -1;
break;
}
if (ret >= 0 && ret <= gf->staticfile.len) {
gf->staticfile.off = ret;
complete(cs, ret, 0);
} else {
complete(cs, -1, EINVAL);
}
}
static void staticfile_flen(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
complete(cs, gf->staticfile.len, 0);
}
/*
* Console semihosting syscall implementations.
*/
static void console_read(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char *ptr;
int ret;
ptr = lock_user(VERIFY_WRITE, buf, len, 0);
if (!ptr) {
complete(cs, -1, EFAULT);
return;
}
ret = qemu_semihosting_console_read(cs, ptr, len);
unlock_user(ptr, buf, ret);
complete(cs, ret, 0);
}
static void console_write(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
char *ptr = lock_user(VERIFY_READ, buf, len, 1);
int ret;
if (!ptr) {
complete(cs, -1, EFAULT);
return;
}
ret = qemu_semihosting_console_write(ptr, len);
unlock_user(ptr, buf, 0);
complete(cs, ret ? ret : -1, ret ? 0 : EIO);
}
static void console_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr addr)
{
static const struct stat tty_buf = {
.st_mode = 020666, /* S_IFCHR, ugo+rw */
.st_rdev = 5, /* makedev(5, 0) -- linux /dev/tty */
};
int ret;
ret = copy_stat_to_user(cs, addr, &tty_buf);
complete(cs, ret ? -1 : 0, ret ? -ret : 0);
}
#ifndef CONFIG_USER_ONLY
static void console_poll_one(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, GIOCondition cond, int timeout)
{
/* The semihosting console does not support urgent data or errors. */
cond &= G_IO_IN | G_IO_OUT;
/*
* Since qemu_semihosting_console_write never blocks, we can
* consider output always ready -- leave G_IO_OUT alone.
* All that remains is to conditionally signal input ready.
* Since output ready causes an immediate return, only block
* for G_IO_IN alone.
*
* TODO: Implement proper timeout. For now, only support
* indefinite wait or immediate poll.
*/
if (cond == G_IO_IN && timeout < 0) {
qemu_semihosting_console_block_until_ready(cs);
/* We returned -- input must be ready. */
} else if ((cond & G_IO_IN) && !qemu_semihosting_console_ready()) {
cond &= ~G_IO_IN;
}
complete(cs, cond, 0);
}
#endif
/*
* Syscall entry points.
*/
void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len,
int gdb_flags, int mode)
{
if (use_gdb_syscalls()) {
gdb_open(cs, complete, fname, fname_len, gdb_flags, mode);
} else {
host_open(cs, complete, fname, fname_len, gdb_flags, mode);
}
}
void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
{
GuestFD *gf = get_guestfd(fd);
if (!gf) {
complete(cs, -1, EBADF);
return;
}
switch (gf->type) {
case GuestFDGDB:
gdb_close(cs, complete, gf);
break;
case GuestFDHost:
host_close(cs, complete, gf);
break;
case GuestFDStatic:
case GuestFDConsole:
complete(cs, 0, 0);
break;
default:
g_assert_not_reached();
}
dealloc_guestfd(fd);
}
void semihost_sys_read_gf(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
/*
* Bound length for 64-bit guests on 32-bit hosts, not overflowing ssize_t.
* Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad
* idea to do this unconditionally.
*/
if (len > INT32_MAX) {
len = INT32_MAX;
}
switch (gf->type) {
case GuestFDGDB:
gdb_read(cs, complete, gf, buf, len);
break;
case GuestFDHost:
host_read(cs, complete, gf, buf, len);
break;
case GuestFDStatic:
staticfile_read(cs, complete, gf, buf, len);
break;
case GuestFDConsole:
console_read(cs, complete, gf, buf, len);
break;
default:
g_assert_not_reached();
}
}
void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, vaddr buf, uint64_t len)
{
GuestFD *gf = get_guestfd(fd);
if (gf) {
semihost_sys_read_gf(cs, complete, gf, buf, len);
} else {
complete(cs, -1, EBADF);
}
}
void semihost_sys_write_gf(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, vaddr buf, uint64_t len)
{
/*
* Bound length for 64-bit guests on 32-bit hosts, not overflowing ssize_t.
* Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad
* idea to do this unconditionally.
*/
if (len > INT32_MAX) {
len = INT32_MAX;
}
switch (gf->type) {
case GuestFDGDB:
gdb_write(cs, complete, gf, buf, len);
break;
case GuestFDHost:
host_write(cs, complete, gf, buf, len);
break;
case GuestFDConsole:
console_write(cs, complete, gf, buf, len);
break;
case GuestFDStatic:
/* Static files are never open for writing: EBADF. */
complete(cs, -1, EBADF);
break;
default:
g_assert_not_reached();
}
}
void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, vaddr buf, uint64_t len)
{
GuestFD *gf = get_guestfd(fd);
if (gf) {
semihost_sys_write_gf(cs, complete, gf, buf, len);
} else {
complete(cs, -1, EBADF);
}
}
void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, int64_t off, int gdb_whence)
{
GuestFD *gf = get_guestfd(fd);
if (!gf) {
complete(cs, -1, EBADF);
return;
}
switch (gf->type) {
case GuestFDGDB:
gdb_lseek(cs, complete, gf, off, gdb_whence);
return;
case GuestFDHost:
host_lseek(cs, complete, gf, off, gdb_whence);
break;
case GuestFDStatic:
staticfile_lseek(cs, complete, gf, off, gdb_whence);
break;
case GuestFDConsole:
complete(cs, -1, ESPIPE);
break;
default:
g_assert_not_reached();
}
}
void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
{
GuestFD *gf = get_guestfd(fd);
if (!gf) {
complete(cs, 0, EBADF);
return;
}
switch (gf->type) {
case GuestFDGDB:
gdb_isatty(cs, complete, gf);
break;
case GuestFDHost:
host_isatty(cs, complete, gf);
break;
case GuestFDStatic:
complete(cs, 0, ENOTTY);
break;
case GuestFDConsole:
complete(cs, 1, 0);
break;
default:
g_assert_not_reached();
}
}
void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb,
gdb_syscall_complete_cb flen_cb, int fd,
vaddr fstat_addr)
{
GuestFD *gf = get_guestfd(fd);
if (!gf) {
flen_cb(cs, -1, EBADF);
return;
}
switch (gf->type) {
case GuestFDGDB:
gdb_fstat(cs, fstat_cb, gf, fstat_addr);
break;
case GuestFDHost:
host_flen(cs, flen_cb, gf);
break;
case GuestFDStatic:
staticfile_flen(cs, flen_cb, gf);
break;
case GuestFDConsole:
default:
g_assert_not_reached();
}
}
void semihost_sys_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, vaddr addr)
{
GuestFD *gf = get_guestfd(fd);
if (!gf) {
complete(cs, -1, EBADF);
return;
}
switch (gf->type) {
case GuestFDGDB:
gdb_fstat(cs, complete, gf, addr);
break;
case GuestFDHost:
host_fstat(cs, complete, gf, addr);
break;
case GuestFDConsole:
console_fstat(cs, complete, gf, addr);
break;
case GuestFDStatic:
default:
g_assert_not_reached();
}
}
void semihost_sys_stat(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len,
vaddr addr)
{
if (use_gdb_syscalls()) {
gdb_stat(cs, complete, fname, fname_len, addr);
} else {
host_stat(cs, complete, fname, fname_len, addr);
}
}
void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr fname, uint64_t fname_len)
{
if (use_gdb_syscalls()) {
gdb_remove(cs, complete, fname, fname_len);
} else {
host_remove(cs, complete, fname, fname_len);
}
}
void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr oname, uint64_t oname_len,
vaddr nname, uint64_t nname_len)
{
if (use_gdb_syscalls()) {
gdb_rename(cs, complete, oname, oname_len, nname, nname_len);
} else {
host_rename(cs, complete, oname, oname_len, nname, nname_len);
}
}
void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr cmd, uint64_t cmd_len)
{
if (use_gdb_syscalls()) {
gdb_system(cs, complete, cmd, cmd_len);
} else {
host_system(cs, complete, cmd, cmd_len);
}
}
void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
vaddr tv_addr, vaddr tz_addr)
{
if (use_gdb_syscalls()) {
gdb_gettimeofday(cs, complete, tv_addr, tz_addr);
} else {
host_gettimeofday(cs, complete, tv_addr, tz_addr);
}
}
#ifndef CONFIG_USER_ONLY
void semihost_sys_poll_one(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, GIOCondition cond, int timeout)
{
GuestFD *gf = get_guestfd(fd);
if (!gf) {
complete(cs, G_IO_NVAL, 1);
return;
}
switch (gf->type) {
case GuestFDGDB:
complete(cs, G_IO_NVAL, 1);
break;
case GuestFDHost:
host_poll_one(cs, complete, gf, cond, timeout);
break;
case GuestFDConsole:
console_poll_one(cs, complete, gf, cond, timeout);
break;
case GuestFDStatic:
default:
g_assert_not_reached();
}
}
#endif
semihosting/uaccess.c
+94
View File
@@ -0,0 +1,94 @@
/*
* Helper routines to provide target memory access for semihosting
* syscalls in system emulation mode.
*
* Copyright (c) 2007 CodeSourcery.
*
* This code is licensed under the GPL
*/
#include "qemu/osdep.h"
#include "accel/tcg/cpu-mmu-index.h"
#include "accel/tcg/probe.h"
#include "exec/target_page.h"
#include "exec/tlb-flags.h"
#include "semihosting/uaccess.h"
void *uaccess_lock_user(CPUArchState *env, vaddr addr,
size_t len, bool copy)
{
void *p = malloc(len);
if (p && copy) {
if (cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0)) {
free(p);
p = NULL;
}
}
return p;
}
ssize_t uaccess_strlen_user(CPUArchState *env, vaddr addr)
{
int mmu_idx = cpu_mmu_index(env_cpu(env), false);
size_t len = 0;
while (1) {
size_t left_in_page;
int flags;
void *h;
/* Find the number of bytes remaining in the page. */
left_in_page = TARGET_PAGE_SIZE - (addr & ~TARGET_PAGE_MASK);
flags = probe_access_flags(env, addr, 0, MMU_DATA_LOAD,
mmu_idx, true, &h, 0);
if (flags & TLB_INVALID_MASK) {
return -1;
}
if (flags & TLB_MMIO) {
do {
uint8_t c;
if (cpu_memory_rw_debug(env_cpu(env), addr, &c, 1, 0)) {
return -1;
}
if (c == 0) {
return len;
}
addr++;
len++;
if (len > INT32_MAX) {
return -1;
}
} while (--left_in_page != 0);
} else {
char *p = memchr(h, 0, left_in_page);
if (p) {
len += p - (char *)h;
return len <= INT32_MAX ? (ssize_t)len : -1;
}
addr += left_in_page;
len += left_in_page;
if (len > INT32_MAX) {
return -1;
}
}
}
}
char *uaccess_lock_user_string(CPUArchState *env, vaddr addr)
{
ssize_t len = uaccess_strlen_user(env, addr);
if (len < 0) {
return NULL;
}
return uaccess_lock_user(env, addr, len + 1, true);
}
void uaccess_unlock_user(CPUArchState *env, void *p,
vaddr addr, size_t len)
{
if (len) {
cpu_memory_rw_debug(env_cpu(env), addr, p, len, 1);
}
free(p);
}
semihosting/user.c
+21
View File
@@ -0,0 +1,21 @@
/*
* Semihosting for user emulation
*
* Copyright (c) 2019 Linaro Ltd
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "semihosting/semihost.h"
bool semihosting_enabled(bool is_user)
{
assert(is_user);
return true;
}
SemihostingTarget semihosting_get_target(void)
{
return SEMIHOSTING_TARGET_AUTO;
}