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| author | Marcel Moolenaar <marcel@FreeBSD.org> | 2000-11-30 05:23:49 +0000 |
|---|---|---|
| committer | Marcel Moolenaar <marcel@FreeBSD.org> | 2000-11-30 05:23:49 +0000 |
| commit | d034d459daf039d21ff432e30dfb48c27ac4d09d (patch) | |
| tree | f3cce8cb66940f910e5e0c8d18a553dea75cf9ac /sys/amd64/include/cpu.h | |
| parent | 083e9ed543e19ff1706dc609b11ff50ca92f1028 (diff) | |
| download | src-d034d459daf039d21ff432e30dfb48c27ac4d09d.tar.gz src-d034d459daf039d21ff432e30dfb48c27ac4d09d.zip | |
Don't use p->p_sigstk.ss_flags to keep state of whether the
process is on the alternate stack or not. For compatibility
with sigstack(2) state is being updated if such is needed.
We now determine whether the process is on the alternate
stack by looking at its stack pointer. This allows a process
to siglongjmp from a signal handler on the alternate stack
to the place of the sigsetjmp on the normal stack. When
maintaining state, this would have invalidated the state
information and causing a subsequent signal to be delivered
on the normal stack instead of the alternate stack.
PR: 22286
Notes
Notes:
svn path=/head/; revision=69379
Diffstat (limited to 'sys/amd64/include/cpu.h')
| -rw-r--r-- | sys/amd64/include/cpu.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/amd64/include/cpu.h b/sys/amd64/include/cpu.h index 669af64c1b47..9293ba29b741 100644 --- a/sys/amd64/include/cpu.h +++ b/sys/amd64/include/cpu.h @@ -58,7 +58,8 @@ #define cpu_exec(p) /* nothing */ #define cpu_swapin(p) /* nothing */ -#define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap)) +#define cpu_getstack(p) ((p)->p_md.md_regs->tf_esp) +#define cpu_setstack(p, ap) ((p)->p_md.md_regs->tf_esp = (ap)) #define CLKF_USERMODE(framep) \ ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM)) |