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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>
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@ -162,6 +162,11 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
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setup_ucontext(&frame->uc, env, set);
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tswap_siginfo(&frame->info, info);
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/*
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* The on-stack signal trampoline is no longer executed;
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* however, the libgcc signal frame unwinding code checks
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* for the presence of these two numeric magic values.
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*/
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install_sigtramp(frame->tramp);
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env->gpr[HEX_REG_PC] = ka->_sa_handler;
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@ -171,8 +176,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
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frame_addr + offsetof(struct target_rt_sigframe, info);
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env->gpr[HEX_REG_R02] =
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frame_addr + offsetof(struct target_rt_sigframe, uc);
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env->gpr[HEX_REG_LR] =
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frame_addr + offsetof(struct target_rt_sigframe, tramp);
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env->gpr[HEX_REG_LR] = default_rt_sigreturn;
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return;
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@ -271,3 +275,14 @@ badframe:
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force_sig(TARGET_SIGSEGV);
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return 0;
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}
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void setup_sigtramp(abi_ulong sigtramp_page)
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{
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uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 4 * 2, 0);
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assert(tramp != NULL);
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default_rt_sigreturn = sigtramp_page;
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install_sigtramp(tramp);
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unlock_user(tramp, sigtramp_page, 4 * 2);
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}
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@ -31,4 +31,6 @@ typedef struct target_sigaltstack {
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#include "../generic/signal.h"
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#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
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#endif /* TARGET_SIGNAL_H */
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