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linux-unwind.h (pa32_read_access_ok): New function. 

* config/pa/linux-unwind.h (pa32_read_access_ok): New function.
	(pa32_fallback_frame_state): Use pa32_read_access_ok to check if
	memory read accesses are ok.

From-SVN: r216716
This commit is contained in:
John David Anglin 2014-10-26 14:46:14 +00:00
parent d44f6d9347
commit ef2810c145
2 changed files with 34 additions and 6 deletions
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6
libgcc/ChangeLog
View File

@ -1,3 +1,9 @@
2014-10-26 John David Anglin <danglin@gcc.gnu.org>
* config/pa/linux-unwind.h (pa32_read_access_ok): New function.
(pa32_fallback_frame_state): Use pa32_read_access_ok to check if
memory read accesses are ok.
2014-10-25 Joseph Myers <joseph@codesourcery.com>
* configure.ac (ppc_fp_type): Set variable on powerpc*-*-linux*.

34
libgcc/config/pa/linux-unwind.h
View File

@ -32,6 +32,17 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#include <signal.h>
#include <sys/ucontext.h>
/* Return TRUE if read access to *P is allowed. */
static inline long
pa32_read_access_ok (void *p)
{
long ret;
__asm__ ("proberi (%1),3,%0" : "=r" (ret) : "r" (p) :);
return ret;
}
/* Unfortunately, because of various bugs and changes to the kernel,
we have several cases to deal with.
@ -48,7 +59,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
tell us how to locate the sigcontext structure.
Note that with a 2.4 64-bit kernel, the signal context is not properly
passed back to userspace so the unwind will not work correctly. */
passed back to userspace so the unwind will not work correctly.
There is also a bug in various glibc versions. The (CONTEXT)->ra
for the outermost frame is not marked as undefined, so we need to
check whether read access is allowed for all the accesses used in
searching for the signal trampoline. */
#define MD_FALLBACK_FRAME_STATE_FOR pa32_fallback_frame_state
@ -73,14 +89,17 @@ pa32_fallback_frame_state (struct _Unwind_Context *context,
e4008200 be,l 0x100(%sr2, %r0), %sr0, %r31
08000240 nop */
if (pc[0] == 0x34190000 || pc[0] == 0x34190002)
if (pa32_read_access_ok (pc)
&& (pc[0] == 0x34190000 || pc[0] == 0x34190002))
off = 4*4;
else if (pc[4] == 0x34190000 || pc[4] == 0x34190002)
else if (pa32_read_access_ok (&pc[4])
&& (pc[4] == 0x34190000 || pc[4] == 0x34190002))
{
pc += 4;
off = 10 * 4;
}
else if (pc[5] == 0x34190000 || pc[5] == 0x34190002)
else if (pa32_read_access_ok (&pc[5])
&& (pc[5] == 0x34190000 || pc[5] == 0x34190002))
{
pc += 5;
off = 10 * 4;
@ -96,13 +115,16 @@ pa32_fallback_frame_state (struct _Unwind_Context *context,
word boundary and we can then determine the frame offset. */
sp = (unsigned long)context->ra;
pc = (unsigned int *)sp;
if ((pc[0] == 0x34190000 || pc[0] == 0x34190002) && (sp & 4))
if ((sp & 4)
&& pa32_read_access_ok (pc)
&& (pc[0] == 0x34190000 || pc[0] == 0x34190002))
off = 5 * 4;
else
return _URC_END_OF_STACK;
}
if (pc[1] != 0x3414015a
if (!pa32_read_access_ok (&pc[3])
|| pc[1] != 0x3414015a
|| pc[2] != 0xe4008200
|| pc[3] != 0x08000240)
return _URC_END_OF_STACK;