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[PATCH v3 06/27] linux-user/alpha: Implement setup_sigtramp
From: |
Richard Henderson |
Subject: |
[PATCH v3 06/27] linux-user/alpha: Implement setup_sigtramp |
Date: |
Fri, 24 Sep 2021 12:59:05 -0400 |
Create and record the two signal trampolines.
Use them when the guest does not use ka_restorer.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/alpha/target_signal.h | 1 +
linux-user/alpha/signal.c | 34 +++++++++++++++++++-------------
2 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/linux-user/alpha/target_signal.h b/linux-user/alpha/target_signal.h
index 250642913e..0b6a39de65 100644
--- a/linux-user/alpha/target_signal.h
+++ b/linux-user/alpha/target_signal.h
@@ -93,6 +93,7 @@ typedef struct target_sigaltstack {
#define TARGET_ARCH_HAS_SETUP_FRAME
#define TARGET_ARCH_HAS_KA_RESTORER
+#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
/* bit-flags */
#define TARGET_SS_AUTODISARM (1U << 31) /* disable sas during sighandling */
diff --git a/linux-user/alpha/signal.c b/linux-user/alpha/signal.c
index 3a820f616b..bbe3dd175a 100644
--- a/linux-user/alpha/signal.c
+++ b/linux-user/alpha/signal.c
@@ -55,13 +55,11 @@ struct target_ucontext {
struct target_sigframe {
struct target_sigcontext sc;
- unsigned int retcode[3];
};
struct target_rt_sigframe {
target_siginfo_t info;
struct target_ucontext uc;
- unsigned int retcode[3];
};
#define INSN_MOV_R30_R16 0x47fe0410
@@ -142,12 +140,7 @@ void setup_frame(int sig, struct target_sigaction *ka,
if (ka->ka_restorer) {
r26 = ka->ka_restorer;
} else {
- __put_user(INSN_MOV_R30_R16, &frame->retcode[0]);
- __put_user(INSN_LDI_R0 + TARGET_NR_sigreturn,
- &frame->retcode[1]);
- __put_user(INSN_CALLSYS, &frame->retcode[2]);
- /* imb() */
- r26 = frame_addr + offsetof(struct target_sigframe, retcode);
+ r26 = default_sigreturn;
}
unlock_user_struct(frame, frame_addr, 1);
@@ -196,12 +189,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
if (ka->ka_restorer) {
r26 = ka->ka_restorer;
} else {
- __put_user(INSN_MOV_R30_R16, &frame->retcode[0]);
- __put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn,
- &frame->retcode[1]);
- __put_user(INSN_CALLSYS, &frame->retcode[2]);
- /* imb(); */
- r26 = frame_addr + offsetof(struct target_rt_sigframe, retcode);
+ r26 = default_rt_sigreturn;
}
if (err) {
@@ -269,3 +257,21 @@ badframe:
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
+
+void setup_sigtramp(abi_ulong sigtramp_page)
+{
+ uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6 * 4, 0);
+ assert(tramp != NULL);
+
+ default_sigreturn = sigtramp_page;
+ __put_user(INSN_MOV_R30_R16, &tramp[0]);
+ __put_user(INSN_LDI_R0 + TARGET_NR_sigreturn, &tramp[1]);
+ __put_user(INSN_CALLSYS, &tramp[2]);
+
+ default_rt_sigreturn = sigtramp_page + 3 * 4;
+ __put_user(INSN_MOV_R30_R16, &tramp[3]);
+ __put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn, &tramp[4]);
+ __put_user(INSN_CALLSYS, &tramp[5]);
+
+ unlock_user(tramp, sigtramp_page, 6 * 4);
+}
--
2.25.1
- [PATCH v3 00/27] linux-user: Move signal trampolines to new page, Richard Henderson, 2021/09/24
- [PATCH v3 05/27] linux-user/arm: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 01/27] linux-user: Add infrastructure for a signal trampoline page, Richard Henderson, 2021/09/24
- [PATCH v3 07/27] linux-user/cris: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 13/27] linux-user/microblaze: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 04/27] linux-user/arm: Drop "_v2" from symbols in signal.c, Richard Henderson, 2021/09/24
- [PATCH v3 02/27] linux-user/aarch64: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 03/27] linux-user/arm: Drop v1 signal frames, Richard Henderson, 2021/09/24
- [PATCH v3 06/27] linux-user/alpha: Implement setup_sigtramp,
Richard Henderson <=
- [PATCH v3 08/27] linux-user/hexagon: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 11/27] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set, Richard Henderson, 2021/09/24
- [PATCH v3 09/27] linux-user/hppa: Document non-use of setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 10/27] linux-user/i386: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 16/27] linux-user/nios2: Properly emulate EXCP_TRAP, Richard Henderson, 2021/09/24