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[PATCH v4 08/25] linux-user/hexagon: Implement setup_sigtramp
From: |
Richard Henderson |
Subject: |
[PATCH v4 08/25] linux-user/hexagon: Implement setup_sigtramp |
Date: |
Mon, 27 Sep 2021 22:00:22 -0400 |
Continue to initialize the words on the stack, as documented.
However, use the off-stack trampoline.
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/hexagon/target_signal.h | 2 ++
linux-user/hexagon/signal.c | 19 +++++++++++++++++--
2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/linux-user/hexagon/target_signal.h
b/linux-user/hexagon/target_signal.h
index 345cf1cbb8..9e0223d322 100644
--- a/linux-user/hexagon/target_signal.h
+++ b/linux-user/hexagon/target_signal.h
@@ -31,4 +31,6 @@ typedef struct target_sigaltstack {
#include "../generic/signal.h"
+#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
+
#endif /* TARGET_SIGNAL_H */
diff --git a/linux-user/hexagon/signal.c b/linux-user/hexagon/signal.c
index c7f0bf6b92..74e61739a0 100644
--- a/linux-user/hexagon/signal.c
+++ b/linux-user/hexagon/signal.c
@@ -162,6 +162,11 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
setup_ucontext(&frame->uc, env, set);
tswap_siginfo(&frame->info, info);
+ /*
+ * The on-stack signal trampoline is no longer executed;
+ * however, the libgcc signal frame unwinding code checks
+ * for the presence of these two numeric magic values.
+ */
install_sigtramp(frame->tramp);
env->gpr[HEX_REG_PC] = ka->_sa_handler;
@@ -171,8 +176,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
frame_addr + offsetof(struct target_rt_sigframe, info);
env->gpr[HEX_REG_R02] =
frame_addr + offsetof(struct target_rt_sigframe, uc);
- env->gpr[HEX_REG_LR] =
- frame_addr + offsetof(struct target_rt_sigframe, tramp);
+ env->gpr[HEX_REG_LR] = default_rt_sigreturn;
return;
@@ -271,3 +275,14 @@ badframe:
force_sig(TARGET_SIGSEGV);
return 0;
}
+
+void setup_sigtramp(abi_ulong sigtramp_page)
+{
+ uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 4 * 2, 0);
+ assert(tramp != NULL);
+
+ default_rt_sigreturn = sigtramp_page;
+ install_sigtramp(tramp);
+
+ unlock_user(tramp, sigtramp_page, 4 * 2);
+}
--
2.25.1
- [PATCH v4 09/25] linux-user/hppa: Document non-use of setup_sigtramp, (continued)
- [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, 2021/09/27
- [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 <=
- [PATCH v4 17/25] linux-user/openrisc: Implement setup_sigtramp, Richard Henderson, 2021/09/27
- [PATCH v4 21/25] linux-user/s390x: Implement setup_sigtramp, Richard Henderson, 2021/09/27