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(siglongjmp): Use macros from jmpbuf.h instead of hardcoded values.

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For ia64, if the longjmp is crossing a signal-frame, install
	the new signal mask by updating the sc_mask member in the
	oldest signal-frame.

(Logical change 1.259)
This commit is contained in:
hp.com!davidm 2004-08-31 13:59:10 +00:00
parent 14abd25ff5
commit e1e7db0e9b
1 changed files with 53 additions and 26 deletions
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79
src/siglongjmp.c
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@ -31,6 +31,9 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include <signal.h>
#include <stdlib.h>
#include "tdep.h"
#include "jmpbuf.h"
#if UNW_TARGET_IA64
# include "ia64/rse.h"
#endif
@ -38,12 +41,13 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
void
siglongjmp (sigjmp_buf env, int val)
{
unw_word_t *mp, *wp = (unw_word_t *) env;
unw_word_t *wp = (unw_word_t *) env;
extern int _UI_siglongjmp_cont;
sigset_t current_mask;
extern int _UI_longjmp_cont;
unw_context_t uc;
unw_cursor_t c;
unw_word_t sp;
int *cont;
if (unw_getcontext (&uc) < 0 || unw_init_local (&c, &uc) < 0)
abort ();
@ -52,7 +56,7 @@ siglongjmp (sigjmp_buf env, int val)
{
if (unw_get_reg (&c, UNW_REG_SP, &sp) < 0)
abort ();
if (sp != wp[0])
if (sp != wp[JB_SP])
continue;
#if UNW_TARGET_IA64
@ -67,40 +71,63 @@ siglongjmp (sigjmp_buf env, int val)
sol = (pfs >> 7) & 0x7f;
bsp = ia64_rse_skip_regs (bsp, sol);
if (bsp != wp[4])
if (bsp != wp[JB_BSP])
continue;
}
#endif
/* found the right frame: */
if (wp[2])
mp = wp + 3;
assert (UNW_NUM_EH_REGS >= 4 && _NSIG <= 16 * sizeof (unw_word_t));
/* default to continuation without sigprocmask() */
cont = &_UI_longjmp_cont;
#if UNW_TARGET_IA64
/* On ia64 we cannot call sigprocmask() at _UI_siglongjmp_cont()
because the signal may have switched stacks and the old
stack's register-backing store may have overflown, leaving us
no space to allocate the stacked registers needed to call
sigprocmask(). Fortunately, we can just let unw_resume()
(via sigreturn) take care of restoring the signal-mask.
That's faster anyhow.
XXX We probably should do the analogous on all architectures. */
if (((struct cursor *) &c)->sigcontext_addr)
{
/* let unw_resume() install the desired signal mask */
struct cursor *cp = (struct cursor *) &c;
struct sigcontext *sc = (struct sigcontext *) cp->sigcontext_addr;
sigset_t current_mask;
void *mp;
if (wp[JB_MASK_SAVED])
mp = &wp[JB_MASK];
else
{
if (sigprocmask (SIG_BLOCK, NULL, &current_mask) < 0)
abort ();
mp = &current_mask;
}
memcpy (&sc->sc_mask, mp, sizeof (sc->sc_mask));
}
else
{
/* sigmask wasn't saved; get it now so we can leave it unchanged. */
if (sigprocmask (SIG_BLOCK, NULL, &current_mask) < 0)
abort ();
mp = (unw_word_t *) &current_mask;
}
#endif
if (wp[JB_MASK_SAVED])
{
/* sigmask was saved */
if (unw_set_reg (&c, UNW_REG_EH + 2, wp[JB_MASK]) < 0
|| (_NSIG > 8 * sizeof (unw_word_t)
&& unw_set_reg (&c, UNW_REG_EH + 3, wp[JB_MASK + 1]) < 0))
abort ();
cont = &_UI_siglongjmp_cont;
}
assert (UNW_NUM_EH_REGS >= 4);
if (unw_set_reg (&c, UNW_REG_EH + 0, wp[1]) < 0
if (unw_set_reg (&c, UNW_REG_EH + 0, wp[JB_RP]) < 0
|| unw_set_reg (&c, UNW_REG_EH + 1, val) < 0
|| unw_set_reg (&c, UNW_REG_EH + 2, mp[0]) < 0
|| unw_set_reg (&c, UNW_REG_IP,
(unw_word_t) &_UI_siglongjmp_cont))
|| unw_set_reg (&c, UNW_REG_IP, (unw_word_t) cont))
abort ();
if (_NSIG > 8 * sizeof (unw_word_t))
{
if (_NSIG > 16 * sizeof (unw_word_t))
abort ();
if (unw_set_reg (&c, UNW_REG_EH + 3, mp[1]) < 0)
abort ();
}
unw_resume (&c);
abort ();