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[RFC] PPC: Skip call to __eabi in main()
- From: Kevin Buettner <kevinb at redhat dot com>
- To: gdb-patches at sourceware dot org
- Date: Mon, 21 Jul 2008 15:53:43 -0700
- Subject: [RFC] PPC: Skip call to __eabi in main()
Some versions of gcc now generate a call to __eabi in main() for the
powerpc-eabi and powerpc-eabispe targets. The patch below causes this
call to be skipped when placing a breakpoint at the first line of
main(), thus fixing quite a few failures when running the test suite.
I've tested this patch against powerpc-eabi and powerpc-eabispe
running on the simulator.
Comments?
* rs6000-tdep.c (rs6000_skip_main_prologue): New function.
(rs6000_gdb_arch_init): Register rs6000_skip_main_prologue.
Index: rs6000-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/rs6000-tdep.c,v
retrieving revision 1.318
diff -u -p -r1.318 rs6000-tdep.c
--- rs6000-tdep.c 15 Jul 2008 18:32:06 -0000 1.318
+++ rs6000-tdep.c 21 Jul 2008 22:39:00 -0000
@@ -1769,6 +1769,32 @@ rs6000_skip_prologue (struct gdbarch *gd
return pc;
}
+/* Check that the code pointed to by PC corresponds to a call to
+ __eabi, skip it if so. Return PC otherwise. */
+
+CORE_ADDR
+rs6000_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ gdb_byte buf[4];
+ unsigned long op;
+
+ if (target_read_memory (pc, buf, 4))
+ return pc;
+ op = extract_unsigned_integer (buf, 4);
+
+ if ((op & 0xfc000001) == 0x48000001)
+ {
+ CORE_ADDR displ = op & 0x03fffffc;
+ CORE_ADDR call_dest = pc + 4 + displ;
+ struct minimal_symbol *s = lookup_minimal_symbol_by_pc (call_dest);
+
+ if (s != NULL
+ && SYMBOL_LINKAGE_NAME (s) != NULL
+ && strcmp (SYMBOL_LINKAGE_NAME (s), "__eabi") == 0)
+ pc += 4;
+ }
+ return pc;
+}
/* All the ABI's require 16 byte alignment. */
static CORE_ADDR
@@ -3238,6 +3264,7 @@ rs6000_gdbarch_init (struct gdbarch_info
set_gdbarch_skip_prologue (gdbarch, rs6000_skip_prologue);
set_gdbarch_in_function_epilogue_p (gdbarch, rs6000_in_function_epilogue_p);
+ set_gdbarch_skip_main_prologue (gdbarch, rs6000_skip_main_prologue);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_breakpoint_from_pc (gdbarch, rs6000_breakpoint_from_pc);