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[PATCH 4/4] Implement get_syscall_trapinfo for arm-linux
- From: Yao Qi <qiyaoltc at gmail dot com>
- To: gdb-patches at sourceware dot org
- Date: Fri, 17 Jun 2016 11:16:25 +0100
- Subject: [PATCH 4/4] Implement get_syscall_trapinfo for arm-linux
- Authentication-results: sourceware.org; auth=none
- References: <1466158585-21833-1-git-send-email-yao dot qi at linaro dot org>
gdb/gdbserver:
2016-06-16 Yao Qi <yao.qi@linaro.org>
* linux-arm-low.c (arm_get_syscall_trapinfo): New function.
(the_low_target): Install arm_get_syscall_trapinfo.
---
gdb/gdbserver/linux-arm-low.c | 33 ++++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)
diff --git a/gdb/gdbserver/linux-arm-low.c b/gdb/gdbserver/linux-arm-low.c
index 2ffda87..67d1bbf 100644
--- a/gdb/gdbserver/linux-arm-low.c
+++ b/gdb/gdbserver/linux-arm-low.c
@@ -951,6 +951,36 @@ arm_supports_hardware_single_step (void)
return 0;
}
+/* Implementation of linux_target_ops method "get_syscall_trapinfo". */
+
+static void
+arm_get_syscall_trapinfo (struct regcache *regcache, int *sysno)
+{
+ if (arm_is_thumb_mode ())
+ collect_register_by_name (regcache, "r7", sysno);
+ else
+ {
+ unsigned long pc;
+ unsigned long insn;
+ unsigned long svc_operand;
+
+ collect_register_by_name (regcache, "pc", &pc);
+ (*the_target->read_memory) (pc - 4, (unsigned char *) &insn, 4);
+ svc_operand = (0x00ffffff & insn);
+
+ if (svc_operand)
+ {
+ /* OABI */
+ *sysno = svc_operand - 0x900000;
+ }
+ else
+ {
+ /* EABI */
+ collect_register_by_name (regcache, "r7", sysno);
+ }
+ }
+}
+
/* Register sets without using PTRACE_GETREGSET. */
static struct regset_info arm_regsets[] = {
@@ -1031,7 +1061,8 @@ struct linux_target_ops the_low_target = {
NULL, /* get_min_fast_tracepoint_insn_len */
NULL, /* supports_range_stepping */
arm_breakpoint_kind_from_current_state,
- arm_supports_hardware_single_step
+ arm_supports_hardware_single_step,
+ arm_get_syscall_trapinfo,
};
void
--
1.9.1