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[RFA] More tweaks to arm_skip_prologue
- From: Michael Snyder <msnyder at cygnus dot com>
- To: gdb-patches at sources dot redhat dot com
- Cc: cagney at redhat dot com, rearnsha at arm dot com
- Date: Mon, 22 Apr 2002 16:53:10 -0700
- Subject: [RFA] More tweaks to arm_skip_prologue
I know that some of these tweaks to arm_skip_prologue will also
suggest similar tweaks to arm_scan_prologue. I'll do those next.
Wouldn't it be nice if the two shared code? ;-)
2002-04-22 Michael Snyder <msnyder@redhat.com>
* arm-tdep.c (arm_skip_prologue): Better handling for frameless
functions. Treat "mov ip, sp" as optional. Recognize
"str lr, [sp, #-nn]".
Index: arm-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/arm-tdep.c,v
retrieving revision 1.51
diff -p -r1.51 arm-tdep.c
*** arm-tdep.c 22 Apr 2002 23:22:04 -0000 1.51
--- arm-tdep.c 23 Apr 2002 00:00:30 -0000
*************** arm_skip_prologue (CORE_ADDR pc)
*** 446,467 ****
by disassembling the instructions. */
skip_pc = pc;
inst = read_memory_integer (skip_pc, 4);
! if (inst != 0xe1a0c00d) /* mov ip, sp */
! return pc;
! skip_pc += 4;
! inst = read_memory_integer (skip_pc, 4);
! if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
! if ((inst & 0xfffff800) != 0xe92dd800) /* stmfd sp!,{...,fp,ip,lr,pc} */
! return pc;
! skip_pc += 4;
! inst = read_memory_integer (skip_pc, 4);
/* Any insns after this point may float into the code, if it makes
for better instruction scheduling, so we skip them only if we
--- 446,475 ----
by disassembling the instructions. */
skip_pc = pc;
inst = read_memory_integer (skip_pc, 4);
! if (inst == 0xe1a0c00d) /* mov ip, sp */
! {
! skip_pc += 4;
! inst = read_memory_integer (skip_pc, 4);
! }
! /* Some prologues begin with "str lr, [sp, #-nn]". */
! if ((inst & 0xffffff00) == 0xe52de000) /* str lr, [sp, #-nn] */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
! if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */
! {
! skip_pc += 4;
! inst = read_memory_integer (skip_pc, 4);
! }
! if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */
! {
! skip_pc += 4;
! inst = read_memory_integer (skip_pc, 4);
! }
/* Any insns after this point may float into the code, if it makes
for better instruction scheduling, so we skip them only if we