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restore: Add restoration of alternative signal stack

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To restore SAS we have two ways:
- call for sigaltstack explicitly in restorer.c right before we call for sigreturn
- pass stack value to sigreturn call and allow the kernel to restore stack for us

Since second way is a simplier one -- we stick with it.

[alekskartashov@: use RT_SIGFRAME_UC]
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov 2013-07-10 17:31:12 +04:00 • committed by Pavel Emelyanov
parent de75a0a326
commit 20b7dafaac
2 changed files with 19 additions and 0 deletions
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17
include/sigframe.h
View file

@ -5,6 +5,9 @@
#ifndef __CR_SIGFRAME_H__
#define __CR_SIGFRAME_H__
#include "asm/types.h"
#include "protobuf/core.pb-c.h"
struct rt_sigframe;
#ifndef __ARCH_SI_PREAMBLE_SIZE
@ -43,4 +46,18 @@ extern int construct_sigframe(struct rt_sigframe *sigframe,
struct rt_sigframe *rsigframe,
CoreEntry *core);
/*
* FIXME Convert it to inline helper, which requires
* to unweave types mess we've generated for
* run-time data.
*/
#define setup_sas(sigframe, sas) \
do { \
if ((sas)) { \
RT_SIGFRAME_UC((sigframe)).uc_stack.ss_sp = (void *)decode_pointer((sas)->ss_sp); \
RT_SIGFRAME_UC((sigframe)).uc_stack.ss_flags = (int)(sas)->ss_flags; \
RT_SIGFRAME_UC((sigframe)).uc_stack.ss_size = (size_t)(sas)->ss_size; \
} \
} while (0)
#endif /* __CR_SIGFRAME_H__ */

2
sigframe.c
View file

@ -31,5 +31,7 @@ int construct_sigframe(struct rt_sigframe *sigframe,
if (restore_gpregs(sigframe, CORE_THREAD_ARCH_INFO(core)->gpregs))
return -1;
setup_sas(sigframe, core->thread_core->sas);
return 0;
}