43 lines
911 B
C
43 lines
911 B
C
|
#include <assert.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <sys/user.h>
|
||
|
|
|
||
|
|
#define XER_SO (1 << 31)
|
||
|
|
#define XER_OV (1 << 30)
|
||
|
|
#define XER_CA (1 << 29)
|
||
|
|
#define XER_OV32 (1 << 19)
|
||
|
|
#define XER_CA32 (1 << 18)
|
||
|
|
|
||
|
|
uint64_t saved;
|
||
|
|
|
||
|
|
void sigill_handler(int sig, siginfo_t *si, void *ucontext)
|
||
|
|
{
|
||
|
|
ucontext_t *uc = ucontext;
|
||
|
|
uc->uc_mcontext.regs->nip += 4;
|
||
|
|
saved = uc->uc_mcontext.regs->xer;
|
||
|
|
uc->uc_mcontext.regs->xer |= XER_OV | XER_OV32;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
uint64_t initial = XER_CA | XER_CA32, restored;
|
||
|
|
struct sigaction sa = {
|
||
|
|
.sa_sigaction = sigill_handler,
|
||
|
|
.sa_flags = SA_SIGINFO
|
||
|
|
};
|
||
|
|
|
||
|
|
sigaction(SIGILL, &sa, NULL);
|
||
|
|
|
||
|
|
asm("mtspr 1, %1\n\t"
|
||
|
|
".long 0x0\n\t"
|
||
|
|
"mfspr %0, 1\n\t"
|
||
|
|
: "=r" (restored)
|
||
|
|
: "r" (initial));
|
||
|
|
|
||
|
|
assert(saved == initial);
|
||
|
|
assert(restored == (XER_OV | XER_OV32 | XER_CA | XER_CA32));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|