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[PATCH v4 19/25] linux-user/ppc: Implement setup_sigtramp
From: |
Richard Henderson |
Subject: |
[PATCH v4 19/25] linux-user/ppc: Implement setup_sigtramp |
Date: |
Mon, 27 Sep 2021 22:00:33 -0400 |
Create and record the two signal trampolines.
Cc: qemu-ppc@nongnu.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/ppc/target_signal.h | 2 ++
linux-user/ppc/signal.c | 34 ++++++++++++++++++----------------
2 files changed, 20 insertions(+), 16 deletions(-)
diff --git a/linux-user/ppc/target_signal.h b/linux-user/ppc/target_signal.h
index 72fcdd9bfa..82184ab8f2 100644
--- a/linux-user/ppc/target_signal.h
+++ b/linux-user/ppc/target_signal.h
@@ -24,4 +24,6 @@ typedef struct target_sigaltstack {
#if !defined(TARGET_PPC64)
#define TARGET_ARCH_HAS_SETUP_FRAME
#endif
+#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
+
#endif /* PPC_TARGET_SIGNAL_H */
diff --git a/linux-user/ppc/signal.c b/linux-user/ppc/signal.c
index 77f37b9f01..c37744c8fc 100644
--- a/linux-user/ppc/signal.c
+++ b/linux-user/ppc/signal.c
@@ -203,9 +203,6 @@ struct target_func_ptr {
#endif
-/* We use the mc_pad field for the signal return trampoline. */
-#define tramp mc_pad
-
/* See arch/powerpc/kernel/signal.c. */
static target_ulong get_sigframe(struct target_sigaction *ka,
CPUPPCState *env,
@@ -436,12 +433,7 @@ void setup_frame(int sig, struct target_sigaction *ka,
/* Save user regs. */
save_user_regs(env, &frame->mctx);
- /* Construct the trampoline code on the stack. */
- encode_trampoline(TARGET_NR_sigreturn, (uint32_t *)&frame->mctx.tramp);
-
- /* The kernel checks for the presence of a VDSO here. We don't
- emulate a vdso, so use a sigreturn system call. */
- env->lr = (target_ulong) h2g(frame->mctx.tramp);
+ env->lr = default_sigreturn;
/* Turn off all fp exceptions. */
env->fpscr = 0;
@@ -477,7 +469,6 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
target_sigset_t *set, CPUPPCState *env)
{
struct target_rt_sigframe *rt_sf;
- uint32_t *trampptr = 0;
struct target_mcontext *mctx = 0;
target_ulong rt_sf_addr, newsp = 0;
int i, err = 0;
@@ -507,22 +498,17 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
#if defined(TARGET_PPC64)
mctx = &rt_sf->uc.tuc_sigcontext.mcontext;
- trampptr = &rt_sf->trampoline[0];
sc = &rt_sf->uc.tuc_sigcontext;
__put_user(h2g(mctx), &sc->regs);
__put_user(sig, &sc->signal);
#else
mctx = &rt_sf->uc.tuc_mcontext;
- trampptr = (uint32_t *)&rt_sf->uc.tuc_mcontext.tramp;
#endif
save_user_regs(env, mctx);
- encode_trampoline(TARGET_NR_rt_sigreturn, trampptr);
- /* The kernel checks for the presence of a VDSO here. We don't
- emulate a vdso, so use a sigreturn system call. */
- env->lr = (target_ulong) h2g(trampptr);
+ env->lr = default_rt_sigreturn;
/* Turn off all fp exceptions. */
env->fpscr = 0;
@@ -720,3 +706,19 @@ abi_long do_swapcontext(CPUArchState *env, abi_ulong
uold_ctx,
return 0;
}
+
+void setup_sigtramp(abi_ulong sigtramp_page)
+{
+ uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 * 8, 0);
+ assert(tramp != NULL);
+
+#ifdef TARGET_ARCH_HAS_SETUP_FRAME
+ default_sigreturn = sigtramp_page;
+ encode_trampoline(TARGET_NR_sigreturn, tramp + 0);
+#endif
+
+ default_rt_sigreturn = sigtramp_page + 8;
+ encode_trampoline(TARGET_NR_rt_sigreturn, tramp + 2);
+
+ unlock_user(tramp, sigtramp_page, 2 * 8);
+}
--
2.25.1
- [PATCH v4 10/25] linux-user/i386: Implement setup_sigtramp, (continued)
- [PATCH v4 10/25] linux-user/i386: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 14/25] linux-user/mips: Tidy install_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 12/25] linux-user/m68k: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 16/25] linux-user/nios2: Document non-use of setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 18/25] linux-user/ppc: Simplify encode_trampoline, Richard Henderson, 2021/09/27
- [PATCH v4 07/25] linux-user/cris: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 09/25] linux-user/hppa: Document non-use of setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 13/25] linux-user/microblaze: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 19/25] linux-user/ppc: Implement setup_sigtramp,
Richard Henderson <=
- [PATCH v4 22/25] linux-user/sh4: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 23/25] linux-user/sparc: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 15/25] linux-user/mips: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 20/25] linux-user/riscv: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 25/25] linux-user: Remove default for TARGET_ARCH_HAS_SIGTRAMP_PAGE, Richard Henderson, 2021/09/27
- [PATCH v4 04/25] linux-user/arm: Drop "_v2" from symbols in signal.c, Richard Henderson, 2021/09/27
- [PATCH v4 24/25] linux-user/xtensa: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 08/25] linux-user/hexagon: Implement setup_sigtramp, Richard Henderson, 2021/09/27