Hello,
on MIPS big endian, ltrace produces a SIGSEGV and only the first argument is
decoded.
ltrace -iS hello looks like this:
[0x7706267c] SYS_mmap(0, , , ) = 0x77075000
[0x77064218] SYS_open(0x7fc3ffe0, , , ) = 3
[0x77064254] SYS_fstat(3, , , ) = 0
[0x77064328] SYS_mmap(0, , , ) = 0x77074000
[0x77064398] SYS_read(3, , , ) = 4096
[0x770645b8] SYS_mmap(0, , , ) = 0x77024000
[0x77064778] SYS_mmap(0x77024000, , , ) = 0x77024000
[0x770613d4] SYS_mmap(0x7705f000, , , ) = 0x7705f000
[0x77064938] SYS_close(3, , , ) = 0
[0x77064b00] SYS_munmap(0x77074000, , , ) = 0
[0x77064218] SYS_open(0x7fc3ffd0, , , ) = 3
[0x77064254] SYS_fstat(3, , , ) = 0
[0x77064328] SYS_mmap(0, , , ) = 0x77074000
[0x77064398] SYS_read(3, , , ) = 4096
[0x770645b8] SYS_mmap(0, , , ) = 0x76fb5000
[0x77064778] SYS_mmap(0x76fb5000, , , ) = 0x76fb5000
[0x770613d4] SYS_mmap(0x7701d000, , , ) = 0x7701d000
[0x770614c8] SYS_mmap(0x7701f000, , , ) = 0x7701f000
[0x77064938] SYS_close(3, , , ) = 0
[0x77064b00] SYS_munmap(0x77074000, , , ) = 0
[0x77064218] SYS_open(0x7fc3ffc0, , , ) = 3
[0x77064254] SYS_fstat(3, , , ) = 0
[0x770642f0] SYS_close(3, , , ) = 0
[0x77063eac] SYS_stat(0x77075544, , , ) = 0
[0x7706267c] SYS_mmap(0, , , ) = 0x77074000
[0x77062ed0] SYS_set_thread_area(0x7707b450, , , ) = 0
[0x77062570] SYS_mprotect(0x7701d000, , , ) = 0
[0x77062570] SYS_mprotect(0x77076000, , , ) = 0
[0x76fc143c] SYS_ioctl(0, , , ) = 0
[0x76fc143c] SYS_ioctl(1, , , ) = -1
[0x4000000] --- SIGSEGV (Segmentation fault) ---
[0xffffffff] +++ killed by SIGSEGV +++
This patch sets up the correct breakpoint opcode and endianness.
After applying the patch, it is necessary to run autoreconf.
Regards
OS
diff --git a/configure.ac b/configure.ac
index 47bd87e..7aeac31 100644
--- a/configure.ac
+++ b/configure.ac
@@ -41,8 +41,12 @@ AC_SUBST(HOST_OS)
case "${host_cpu}" in
arm*|sa110) HOST_CPU="arm" ;;
cris*) HOST_CPU="cris" ;;
- mips*el) HOST_CPU="mipsel" ;;
- mips*) HOST_CPU="mips" ;;
+ mips*el) HOST_CPU="mipsel"
+ AC_DEFINE([HAVE_ENDIAN_LITTLE], [1], [we have a little
endian machine])
+ ;;
+ mips*) HOST_CPU="mips"
+ AC_DEFINE([HAVE_ENDIAN_BIG], [1], [we have a big endian
machine])
+ ;;
powerpc|powerpc64) HOST_CPU="ppc" ;;
sun4u|sparc64) HOST_CPU="sparc" ;;
s390x) HOST_CPU="s390" ;;
diff --git a/sysdeps/linux-gnu/mipsel/arch.h b/sysdeps/linux-gnu/mipsel/arch.h
index ba1220d..6513c26 100644
--- a/sysdeps/linux-gnu/mipsel/arch.h
+++ b/sysdeps/linux-gnu/mipsel/arch.h
@@ -22,13 +22,24 @@
#ifndef LTRACE_MIPS_ARCH_H
#define LTRACE_MIPS_ARCH_H
+#include "config.h"
+
#include <stddef.h>
#include <gelf.h>
-#define BREAKPOINT_VALUE { 0x0d, 0x00, 0x00, 0x00 }
+#ifdef HAVE_ENDIAN_LITTLE
+ #define BREAKPOINT_VALUE { 0x0d, 0x00, 0x00, 0x00 }
+ #define ARCH_ENDIAN_LITTLE
+#elif defined (HAVE_ENDIAN_BIG)
+ #define BREAKPOINT_VALUE { 0x00, 0x00, 0x00, 0x0d }
+ #define ARCH_ENDIAN_BIG
+#else
+ #error HAVE_ENDIAN_LITTLE or HAVE_ENDIAN_BIG must be defined
+#endif
+
#define BREAKPOINT_LENGTH 4
#define DECR_PC_AFTER_BREAK 0
-#define ARCH_ENDIAN_LITTLE
+
#define LT_ELFCLASS ELFCLASS32
#define LT_ELF_MACHINE EM_MIPS
_______________________________________________
Ltrace-devel mailing list
[email protected]
http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/ltrace-devel
