On 01/30/2012 12:15 PM, Denys Vlasenko wrote:
commit:
http://git.busybox.net/busybox/commit/?id=da2b2da6a708edffcc3b405ab5fd7f3f11af5d33
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
Signed-off-by: Denys Vlasenko<[email protected]>
---
init/init.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/init/init.c b/init/init.c
index c540faa..7248946 100644
--- a/init/init.c
+++ b/init/init.c
@@ -108,6 +108,8 @@
//config: Note that on Linux, init attempts to detect serial terminal
and
//config: sets TERM to "vt102" if one is found.
+#define DEBUG_SEGV_HANDLER 0
+
#include "libbb.h"
#include<syslog.h>
#include<paths.h>
@@ -118,6 +120,15 @@
#endif
#include "reboot.h" /* reboot() constants */
+#if DEBUG_SEGV_HANDLER
+# undef _GNU_SOURCE
+# define _GNU_SOURCE 1
+# undef __USE_GNU
+# define __USE_GNU 1
+# include<execinfo.h>
+# include<sys/ucontext.h>
+#endif
+
/* Used only for sanitizing purposes in set_sane_term() below. On systems
where
* the baud rate is stored in a separate field, we can safely disable them. */
#ifndef CBAUD
@@ -957,6 +968,33 @@ static int check_delayed_sigs(void)
}
}
+#if DEBUG_SEGV_HANDLER
+static
+void handle_sigsegv(int sig, siginfo_t *info, void *ucontext)
+{
+ long ip;
+ ucontext_t *uc;
+
+ uc = ucontext;
+ ip = uc->uc_mcontext.gregs[REG_EIP];
[...]
Hi Denys,
Are you sure that this part of code is portable?
Last time I looked uc->uc_mcontext data structure was not.
I am working with an ARM gcc-.4.4.5 toolchain currently for instance,
here is how uc_mcontext is defined:
struct sigcontext {
unsigned long trap_no;
unsigned long error_code;
unsigned long oldmask;
unsigned long arm_r0;
unsigned long arm_r1;
unsigned long arm_r2;
unsigned long arm_r3;
unsigned long arm_r4;
unsigned long arm_r5;
unsigned long arm_r6;
unsigned long arm_r7;
unsigned long arm_r8;
unsigned long arm_r9;
unsigned long arm_r10;
unsigned long arm_fp;
unsigned long arm_ip;
unsigned long arm_sp;
unsigned long arm_lr;
unsigned long arm_pc;
unsigned long arm_cpsr;
unsigned long fault_address;
};
typedef struct sigcontext mcontext_t;
/* Userlevel context. */
typedef struct ucontext
{
unsigned long uc_flags;
struct ucontext *uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
__sigset_t uc_sigmask;
unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
} ucontext_t;
as you can see, there is no 'gregs' field.
I think this part of your code is specific to x86.
Best regards,
AWG
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