Import QEMU upstream snapshot d2e570c

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

Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475

linux-user/microblaze/signal.c

@@ -0,0 +1,175 @@
+/*
+ *  Emulation of Linux signals
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ *  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/>.
+ */
+#include "qemu/osdep.h"
+#include "qemu.h"
+#include "user-internals.h"
+#include "signal-common.h"
+#include "linux-user/trace.h"
+#include "target_ptrace.h"
+
+struct target_sigcontext {
+    struct target_pt_regs regs;  /* needs to be first */
+    uint32_t oldmask;
+};
+
+struct target_stack_t {
+    abi_ulong ss_sp;
+    int ss_flags;
+    unsigned int ss_size;
+};
+
+struct target_ucontext {
+    abi_ulong tuc_flags;
+    abi_ulong tuc_link;
+    target_stack_t tuc_stack;
+    struct target_sigcontext tuc_mcontext;
+    target_sigset_t tuc_sigmask;
+};
+
+/* Signal frames. */
+struct target_rt_sigframe {
+    target_siginfo_t info;
+    struct target_ucontext uc;
+    uint32_t tramp[2];
+};
+
+static void setup_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
+{
+    for (int i = 0; i < 32; ++i) {
+        __put_user(env->regs[i], &sc->regs.r[i]);
+    }
+    __put_user(env->pc, &sc->regs.pc);
+}
+
+static void restore_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
+{
+    for (int i = 0; i < 32; ++i) {
+        __get_user(env->regs[i], &sc->regs.r[i]);
+    }
+    __get_user(env->pc, &sc->regs.pc);
+}
+
+static abi_ulong get_sigframe(struct target_sigaction *ka,
+                              CPUMBState *env, int frame_size)
+{
+    abi_ulong sp = env->regs[1];
+
+    sp = target_sigsp(sp, ka);
+
+    return ((sp - frame_size) & -8UL);
+}
+
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUMBState *env)
+{
+    struct target_rt_sigframe *frame;
+    abi_ulong frame_addr;
+
+    frame_addr = get_sigframe(ka, env, sizeof *frame);
+    trace_user_setup_rt_frame(env, frame_addr);
+
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        force_sigsegv(sig);
+        return;
+    }
+
+    frame->info = *info;
+
+    __put_user(0, &frame->uc.tuc_flags);
+    __put_user(0, &frame->uc.tuc_link);
+
+    target_save_altstack(&frame->uc.tuc_stack, env);
+    setup_sigcontext(&frame->uc.tuc_mcontext, env);
+
+    for (int i = 0; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
+    }
+
+    /* Kernel does not use SA_RESTORER. */
+
+    /*
+     * Return from sighandler will jump to the tramp.
+     * Negative 8 offset because return is rtsd r15, 8
+     */
+    env->regs[15] = default_rt_sigreturn - 8;
+
+    /* Set up registers for signal handler */
+    env->regs[1] = frame_addr;
+
+    /* Signal handler args: */
+    env->regs[5] = sig;
+    env->regs[6] = frame_addr + offsetof(struct target_rt_sigframe, info);
+    env->regs[7] = frame_addr + offsetof(struct target_rt_sigframe, uc);
+
+    /* Offset to handle microblaze rtid r14, 0 */
+    env->pc = (unsigned long)ka->_sa_handler;
+
+    unlock_user_struct(frame, frame_addr, 1);
+}
+
+
+long do_sigreturn(CPUMBState *env)
+{
+    return -TARGET_ENOSYS;
+}
+
+long do_rt_sigreturn(CPUMBState *env)
+{
+    struct target_rt_sigframe *frame = NULL;
+    abi_ulong frame_addr = env->regs[1];
+    sigset_t set;
+
+    trace_user_do_rt_sigreturn(env, frame_addr);
+
+    if  (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
+    set_sigmask(&set);
+
+    restore_sigcontext(&frame->uc.tuc_mcontext, env);
+
+    target_restore_altstack(&frame->uc.tuc_stack, env);
+
+    unlock_user_struct(frame, frame_addr, 0);
+    return -QEMU_ESIGRETURN;
+
+ badframe:
+    unlock_user_struct(frame, frame_addr, 0);
+    force_sig(TARGET_SIGSEGV);
+    return -QEMU_ESIGRETURN;
+}
+
+void setup_sigtramp(abi_ulong sigtramp_page)
+{
+    uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 8, 0);
+    assert(tramp != NULL);
+
+    /*
+     * addi r12, r0, __NR_rt_sigreturn
+     * brki r14, 0x8
+     */
+    __put_user(0x31800000U | TARGET_NR_rt_sigreturn, tramp);
+    __put_user(0xb9cc0008U, tramp + 1);
+
+    default_rt_sigreturn = sigtramp_page;
+    unlock_user(tramp, sigtramp_page, 8);
+}