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aarch64: makecontext comply with standard

pull/22/head
osy 2021-01-04 15:41:58 -08:00
parent a7d36d8db4
commit fc3b5e724e
1 changed files with 8 additions and 6 deletions
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14
arch/aarch64/makecontext.c
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@ -32,14 +32,16 @@ _Static_assert(offsetof(libucontext_ucontext_t, uc_mcontext.pstate) == PSTATE_OF
void
libucontext_makecontext(libucontext_ucontext_t *ucp, void (*func)(void), int argc, ...)
{
unsigned long *sp;
unsigned long *regp;
// specs require only 'int' arguments so stack arguments are int type
// while register argument take the full width of libucontext_greg_t
int *sp;
libucontext_greg_t *regp;
va_list va;
int i;
sp = (unsigned long *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
sp = (int *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
sp -= argc < 8 ? 0 : argc - 8;
sp = (unsigned long *) (((uintptr_t) sp & -16L));
sp = (int *) (((uintptr_t) sp & -16L));
ucp->uc_mcontext.sp = (uintptr_t) sp;
ucp->uc_mcontext.pc = (uintptr_t) func;
@ -51,10 +53,10 @@ libucontext_makecontext(libucontext_ucontext_t *ucp, void (*func)(void), int arg
regp = &(ucp->uc_mcontext.regs[0]);
for (i = 0; (i < argc && i < 8); i++)
*regp++ = va_arg (va, unsigned long);
*regp++ = va_arg (va, int);
for (; i < argc; i++)
*sp++ = va_arg (va, unsigned long);
*sp++ = va_arg (va, int);
va_end(va);
}