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[RFC/TileGX] fix longjmp bug
- From: Jiong Wang <jiwang at tilera dot com>
- To: <gdb-patches at sourceware dot org>
- Date: Fri, 1 Mar 2013 17:58:18 +0800
- Subject: [RFC/TileGX] fix longjmp bug
tilegx is lack of get_longjmp_target support.
this patch fix this. please review.
thanks.
gdb/ChangeLog:
* tilegx-tdep.c (tilegx_get_longjmp_target): New function.
(tilegx_gdbarch_init): Install it.
--
Regards,
Jiong. Wang
Tilera Corporation.
---
gdb/tilegx-tdep.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/gdb/tilegx-tdep.c b/gdb/tilegx-tdep.c
index 2c4e349..d9a8ed2 100644
--- a/gdb/tilegx-tdep.c
+++ b/gdb/tilegx-tdep.c
@@ -785,6 +785,28 @@ tilegx_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
return 0;
}
+/* This is the implementation of gdbarch method get_longjmp_target. */
+
+static int
+tilegx_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR jb_addr;
+ char buf[8];
+
+ jb_addr = get_frame_register_unsigned (frame, TILEGX_R0_REGNUM);
+
+ /* TileGX jmp_buf contains 32 elements of type __uint_reg_t which
+ is size of 8bytes, the return address is stored in the 25th slot. */
+ if (target_read_memory (jb_addr + 25 * 8, buf, 8))
+ return 0;
+
+ *pc = extract_unsigned_integer (buf, 8, byte_order);
+
+ return 1;
+}
+
/* by assigning the 'faultnum' reg in kernel pt_regs with this value,
kernel do_signal will not check r0. see tilegx kernel/signal.c
for details. */
@@ -1030,6 +1052,7 @@ tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
/* These values and methods are used when gdb calls a target function. */
set_gdbarch_push_dummy_call (gdbarch, tilegx_push_dummy_call);
+ set_gdbarch_get_longjmp_target (gdbarch, tilegx_get_longjmp_target);
set_gdbarch_write_pc (gdbarch, tilegx_write_pc);
set_gdbarch_breakpoint_from_pc (gdbarch, tilegx_breakpoint_from_pc);
set_gdbarch_return_value (gdbarch, tilegx_return_value);