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linux-user: introduce target_sigsp() and target_save_altstack()

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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180411192347.30228-1-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2018-04-11 21:23:47 +02:00
parent e8fa729574
commit 465e237bf7
19 changed files with 108 additions and 203 deletions
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28
linux-user/sparc/signal.c
View file

@ -123,18 +123,28 @@ static inline abi_ulong get_sigframe(struct target_sigaction *sa,
CPUSPARCState *env,
unsigned long framesize)
{
abi_ulong sp;
abi_ulong sp = get_sp_from_cpustate(env);
sp = env->regwptr[UREG_FP];
/*
* If we are on the alternate signal stack and would overflow it, don't.
* Return an always-bogus address instead so we will die with SIGSEGV.
*/
if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) {
return -1;
}
/* This is the X/Open sanctioned signal stack switching. */
if (sa->sa_flags & TARGET_SA_ONSTACK) {
if (!on_sig_stack(sp)
&& !((target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size) & 7)) {
sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
}
}
return sp - framesize;
sp = target_sigsp(sp, sa) - framesize;
/* Always align the stack frame. This handles two cases. First,
* sigaltstack need not be mindful of platform specific stack
* alignment. Second, if we took this signal because the stack
* is not aligned properly, we'd like to take the signal cleanly
* and report that.
*/
sp &= ~15UL;
return sp;
}
static int