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| author | Richard Henderson <richard.henderson@linaro.org> | 2021-09-29 09:05:35 -0400 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2021-10-01 12:03:48 +0200 |
| commit | c8ef02b1acf0d78e909c6cbd38ed60ecc5ce52ff (patch) | |
| tree | 66e941e101ebd134ba9545cfb59743ac27ca4c5a /linux-user/hexagon/signal.c | |
| parent | e281c2bafe22135c47caf7e1fa9db19647e49c3d (diff) | |
| download | focaccia-qemu-c8ef02b1acf0d78e909c6cbd38ed60ecc5ce52ff.tar.gz focaccia-qemu-c8ef02b1acf0d78e909c6cbd38ed60ecc5ce52ff.zip | |
linux-user/hexagon: Implement setup_sigtramp
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> Message-Id: <20210929130553.121567-9-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user/hexagon/signal.c')
| -rw-r--r-- | linux-user/hexagon/signal.c | 19 |
1 files changed, 17 insertions, 2 deletions
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); +} |