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authorSergio Durigan Junior <sergiodj@redhat.com>2013-08-22 20:32:54 +0000
committerSergio Durigan Junior <sergiodj@redhat.com>2013-08-22 20:32:54 +0000
commit9f948660082197e73991d4d0db07030420c33e45 (patch)
treee315922fd0a016cf8f350026411d6ea1b83fd030 /gdb/arm-linux-tdep.c
parentf69a2f978fdcffafa9fe4c4a5b3b2b1af61698ba (diff)
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[Committing the `catch syscall' patch for ARM, from Samuel Bronson.]
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.
Diffstat (limited to 'gdb/arm-linux-tdep.c')
-rw-r--r--gdb/arm-linux-tdep.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c
index 1502bdc..6ac61cc 100644
--- a/gdb/arm-linux-tdep.c
+++ b/gdb/arm-linux-tdep.c
@@ -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;
}