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Fix Unwind support on DragonFly BSD after sigtramp move

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2017-07-19  John Marino  <gnugcc@marino.st>

	* config/i386/dragonfly-unwind.h: Handle sigtramp relocation.

From-SVN: r250354
This commit is contained in:
John Marino 2017-07-19 15:55:11 +00:00 committed by Jonathan Wakely
parent e020783cd6
commit de7422048e
2 changed files with 44 additions and 15 deletions
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4
libgcc/ChangeLog
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@ -1,3 +1,7 @@
2017-07-19 John Marino <gnugcc@marino.st>
* config/i386/dragonfly-unwind.h: Handle sigtramp relocation.
2017-07-12 Michael Meissner <meissner@linux.vnet.ibm.com>
PR target/81193

55
libgcc/config/i386/dragonfly-unwind.h
View File

@ -28,9 +28,13 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/param.h>
#include <signal.h>
#include <sys/ucontext.h>
#include <machine/sigframe.h>
#if __DragonFly_version > 400800
#include <sys/kinfo.h>
#endif
#define REG_NAME(reg) sf_uc.uc_mcontext.mc_## reg
@ -39,20 +43,44 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define MD_FALLBACK_FRAME_STATE_FOR x86_64_dragonfly_fallback_frame_state
static void
x86_64_sigtramp_range (unsigned char **start, unsigned char **end)
static int
x86_64_outside_sigtramp_range (unsigned char *pc)
{
unsigned long ps_strings;
int mib[2];
size_t len;
static int sigtramp_range_determined = 0;
static unsigned char *sigtramp_start, *sigtramp_end;
mib[0] = CTL_KERN;
mib[1] = KERN_PS_STRINGS;
len = sizeof (ps_strings);
sysctl (mib, 2, &ps_strings, &len, NULL, 0);
if (sigtramp_range_determined == 0)
{
#if __DragonFly_version > 400800
struct kinfo_sigtramp kst = {0};
size_t len = sizeof (kst);
int mib[3] = { CTL_KERN, KERN_PROC, KERN_PROC_SIGTRAMP };
*start = (unsigned char *)ps_strings - 32;
*end = (unsigned char *)ps_strings;
sigtramp_range_determined = 1;
if (sysctl (mib, 3, &kst, &len, NULL, 0) == 0)
{
sigtramp_range_determined = 2;
sigtramp_start = kst.ksigtramp_start;
sigtramp_end = kst.ksigtramp_end;
}
#else
unsigned long ps_strings;
size_t len = sizeof (ps_strings);
int mib[2] = { CTL_KERN, KERN_PS_STRINGS };
sigtramp_range_determined = 1;
if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
{
sigtramp_range_determined = 2;
sigtramp_start = (unsigned char *)ps_strings - 32;
sigtramp_end = (unsigned char *)ps_strings;
}
#endif
}
if (sigtramp_range_determined < 2) /* sysctl failed if < 2 */
return 1;
return (pc < sigtramp_start || pc >= sigtramp_end );
}
@ -60,13 +88,10 @@ static _Unwind_Reason_Code
x86_64_dragonfly_fallback_frame_state
(struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
unsigned char *pc = context->ra;
unsigned char *sigtramp_start, *sigtramp_end;
struct sigframe *sf;
long new_cfa;
x86_64_sigtramp_range(&sigtramp_start, &sigtramp_end);
if (pc >= sigtramp_end || pc < sigtramp_start)
if (x86_64_outside_sigtramp_range(context->ra))
return _URC_END_OF_STACK;
sf = (struct sigframe *) context->cfa;