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[PATCH 6/8] Implement unconditional_branch_address method for powerpc / rs6000
- From: Kevin Buettner <kevinb at redhat dot com>
- To: gdb-patches at sourceware dot org
- Date: Wed, 19 Aug 2015 00:11:32 -0700
- Subject: [PATCH 6/8] Implement unconditional_branch_address method for powerpc / rs6000
- Authentication-results: sourceware.org; auth=none
- References: <20150818235334 dot 1afb0c85 at pinnacle dot lan>
Implement unconditional_branch_address method for powerpc / rs6000.
gdb/ChangeLog:
* rs6000-tdep.c (rs6000_unconditional_branch_address): New function.
(rs6000_gdbarch_init): Register rs6000_unconditional_branch_address.
---
gdb/rs6000-tdep.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 785f451..f1c33e0 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -3578,6 +3578,20 @@ ppc_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
reg->how = DWARF2_FRAME_REG_CFA;
}
+/* Implement the unconditional_branch_address gdbarch method. */
+
+static CORE_ADDR
+rs6000_unconditional_branch_address (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ unsigned long insn = read_memory_unsigned_integer (pc, 4, byte_order);
+
+ if ((insn & 0xfc000003) == 0x48000000) /* b instruction. */
+ return pc + (((insn & 0x02000000) ? ~((CORE_ADDR) 0x03fffffc) : 0)
+ | (insn & 0x03fffffc));
+ else
+ return 0;
+}
/* Return true if a .gnu_attributes section exists in BFD and it
indicates we are using SPE extensions OR if a .PPC.EMB.apuinfo
@@ -6051,6 +6065,10 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
else
register_ppc_ravenscar_ops (gdbarch);
+ /* Unconditional Branch. */
+ set_gdbarch_unconditional_branch_address
+ (gdbarch, rs6000_unconditional_branch_address);
+
return gdbarch;
}