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um: extend fpstate to _xstate to support YMM registers

Browse source 
Extends fpstate to _xstate, in order to hold AVX/YMM registers.

To avoid oversized stack frame, the following functions have been
refactored by using malloc.
 - sig_handler_common
 - timer_real_alarm_handler

Signed-off-by: Eli Cooper <[email protected]>
This commit is contained in:
Eli Cooper 2016-03-20 00:58:40 +08:00 • committed by Richard Weinberger
commit b6024b21fe
3 changed files with 32 additions and 21 deletions
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28
arch/um/os-Linux/signal.c
View file

@ -29,23 +29,29 @@ void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
{
struct uml_pt_regs r;
struct uml_pt_regs *r;
int save_errno = errno;
r.is_user = 0;
r = malloc(sizeof(struct uml_pt_regs));
if (!r)
panic("out of memory");
r->is_user = 0;
if (sig == SIGSEGV) {
/* For segfaults, we want the data from the sigcontext. */
get_regs_from_mc(&r, mc);
GET_FAULTINFO_FROM_MC(r.faultinfo, mc);
get_regs_from_mc(r, mc);
GET_FAULTINFO_FROM_MC(r->faultinfo, mc);
}
/* enable signals if sig isn't IRQ signal */
if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGALRM))
unblock_signals();
(*sig_info[sig])(sig, si, &r);
(*sig_info[sig])(sig, si, r);
errno = save_errno;
free(r);
}
/*
@ -83,11 +89,17 @@ void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
static void timer_real_alarm_handler(mcontext_t *mc)
{
struct uml_pt_regs regs;
struct uml_pt_regs *regs;
regs = malloc(sizeof(struct uml_pt_regs));
if (!regs)
panic("out of memory");
if (mc != NULL)
get_regs_from_mc(&regs, mc);
timer_handler(SIGALRM, NULL, &regs);
get_regs_from_mc(regs, mc);
timer_handler(SIGALRM, NULL, regs);
free(regs);
}
void timer_alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)