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Fix signal delivery for the iBCS2 binaries. The iBCS2 sysvec uses

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current FreeBSD signal trampoline, but does not specifies
sv_sigcode_base, since shared page is not mapped.  This results in the
zero %eip for the signal frame.  Fall back to calculating %eip as
offset from the psstrings when sv_sigcode_base is not initialized.

Reported by:	Rich Naill <rich@enterprisesystems.net>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2013-11-08 16:57:55 +00:00
parent 647e61eaca
commit 760faf9fdd
1 changed files with 2 additions and 0 deletions
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2
sys/i386/i386/machdep.c
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@ -757,6 +757,8 @@ sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
regs->tf_esp = (int)sfp;
regs->tf_eip = p->p_sysent->sv_sigcode_base;
if (regs->tf_eip == 0)
regs->tf_eip = p->p_sysent->sv_psstrings - szsigcode;
regs->tf_eflags &= ~(PSL_T | PSL_D);
regs->tf_cs = _ucodesel;
regs->tf_ds = _udatasel;