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[Committing the `catch syscall' patch for ARM, from Samuel Bronson.]

Browse Source 
This time, it passes all the tests and comes with a nearly complete
XML file (plus a script that can nearly regenerate the XML file).

(I elected to leave out __ARM_NR_cmpxchg, since it has dire warnings
to the effect that the only pieces of code that should be aware of it
are the implementation and the __kuser_cmpxchg code in entry-armv.S.)

gdb/
2013-08-14  Samuel Bronson  <naesten@gmail.com>

	ARM Linux support for `catch syscall'.
	* syscalls/arm-linux.py: New file.
	* syscalls/arm-linux.xml: Likewise.
	* arm-linux-tdep.c (arm_linux_get_syscall_number): New function.
	(arm_linux_init_abi): Register the new function and syscall xml file.
	* data-directory/Makefile.in: Install the new syscall xml file.
	* NEWS: Brag about this.

gdb/testsuite/
2013-08-14  Samuel Bronson  <naesten@gmail.com>

	ARM Linux support for `catch syscall'.
	* gdb.base/catch-syscall.exp: Test this on ARM now.
	(fill_all_syscalls_numbers): ARM has close/chroot on 6/61, too.
This commit is contained in:
Sergio Durigan Junior 2013-08-22 20:32:54 +00:00
parent f69a2f978f
commit 9f94866008
6 changed files with 82 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
gdb/ChangeLog
View File

@ -1,3 +1,13 @@
2013-08-22 Samuel Bronson <naesten@gmail.com>
ARM Linux support for `catch syscall'.
* syscalls/arm-linux.py: New file.
* syscalls/arm-linux.xml: Likewise.
* arm-linux-tdep.c (arm_linux_get_syscall_number): New function.
(arm_linux_init_abi): Register the new function and syscall xml file.
* data-directory/Makefile.in: Install the new syscall xml file.
* NEWS: Brag about this.
2013-08-22 Pedro Alves <palves@redhat.com>
PR gdb/15871

2
gdb/NEWS
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@ -3,6 +3,8 @@
*** Changes since GDB 7.6
* The "catch syscall" command now works on arm*-linux* targets.
* Python scripting
** Frame filters and frame decorators have been added.

58
gdb/arm-linux-tdep.c
View File

@ -33,6 +33,7 @@
#include "tramp-frame.h"
#include "breakpoint.h"
#include "auxv.h"
#include "xml-syscall.h"
#include "arm-tdep.h"
#include "arm-linux-tdep.h"
@ -794,6 +795,59 @@ arm_linux_sigreturn_return_addr (struct frame_info *frame,
return 0;
}
/* At a ptrace syscall-stop, return the syscall number. This either
comes from the SWI instruction (OABI) or from r7 (EABI).
When the function fails, it should return -1. */
static LONGEST
arm_linux_get_syscall_number (struct gdbarch *gdbarch,
ptid_t ptid)
{
struct regcache *regs = get_thread_regcache (ptid);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
ULONGEST pc;
ULONGEST cpsr;
ULONGEST t_bit = arm_psr_thumb_bit (gdbarch);
int is_thumb;
ULONGEST svc_number = -1;
regcache_cooked_read_unsigned (regs, ARM_PC_REGNUM, &pc);
regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &cpsr);
is_thumb = (cpsr & t_bit) != 0;
if (is_thumb)
{
regcache_cooked_read_unsigned (regs, 7, &svc_number);
}
else
{
enum bfd_endian byte_order_for_code =
gdbarch_byte_order_for_code (gdbarch);
/* PC gets incremented before the syscall-stop, so read the
previous instruction. */
unsigned long this_instr =
read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code);
unsigned long svc_operand = (0x00ffffff & this_instr);
if (svc_operand)
{
/* OABI */
svc_number = svc_operand - 0x900000;
}
else
{
/* EABI */
regcache_cooked_read_unsigned (regs, 7, &svc_number);
}
}
return svc_number;
}
/* When FRAME is at a syscall instruction, return the PC of the next
instruction to be executed. */
@ -1294,6 +1348,10 @@ arm_linux_init_abi (struct gdbarch_info info,
tdep->syscall_next_pc = arm_linux_syscall_next_pc;
/* `catch syscall' */
set_xml_syscall_file_name ("syscalls/arm-linux.xml");
set_gdbarch_get_syscall_number (gdbarch, arm_linux_get_syscall_number);
/* Syscall record. */
tdep->arm_swi_record = NULL;
}

1
gdb/data-directory/Makefile.in
View File

@ -45,6 +45,7 @@ SYSCALLS_DIR = syscalls
SYSCALLS_INSTALL_DIR = $(DESTDIR)$(GDB_DATADIR)/$(SYSCALLS_DIR)
SYSCALLS_FILES = \
gdb-syscalls.dtd \
arm-linux.xml \
ppc-linux.xml ppc64-linux.xml \
i386-linux.xml amd64-linux.xml \
sparc-linux.xml sparc64-linux.xml \

6
gdb/testsuite/ChangeLog
View File

@ -1,3 +1,9 @@
2013-08-22 Samuel Bronson <naesten@gmail.com>
ARM Linux support for `catch syscall'.
* gdb.base/catch-syscall.exp: Test this on ARM now.
(fill_all_syscalls_numbers): ARM has close/chroot on 6/61, too.
2013-08-22 Tom Tromey <tromey@redhat.com>
* lib/dwarf.exp (cu, tu): Handle addr_size of "default". Change

9
gdb/testsuite/gdb.base/catch-syscall.exp
View File

@ -34,7 +34,7 @@ if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-linux*"]} then {
if { ![istarget "x86_64-*-linux*"] && ![istarget "i\[34567\]86-*-linux*"]
&& ![istarget "powerpc-*-linux*"] && ![istarget "powerpc64-*-linux*"]
&& ![istarget "sparc-*-linux*"] && ![istarget "sparc64-*-linux*"]
&& ![istarget "mips*-linux*"] } {
&& ![istarget "mips*-linux*"] && ![istarget "arm*-linux*"] } {
continue
}
@ -407,11 +407,12 @@ proc do_syscall_tests_without_xml {} {
proc fill_all_syscalls_numbers {} {
global all_syscalls_numbers
# For Linux on x86, PPC, PPC64, SPARC and SPARC64, the numbers for the syscalls
# "close" and "chroot" are the same.
# For Linux on x86, PPC, PPC64, SPARC, SPARC64 and ARM,
# the numbers for the syscalls "close" and "chroot" are the same.
if { [istarget "i\[34567\]86-*-linux*"]
|| [istarget "powerpc-*-linux*"] || [istarget "powerpc64-*-linux*"]
|| [istarget "sparc-*-linux*"] || [istarget "sparc64-*-linux*"] } {
|| [istarget "sparc-*-linux*"] || [istarget "sparc64-*-linux*"]
|| [istarget "arm*-linux*"] } {
set all_syscalls_numbers { "6" "61" }
}
}