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* m88k-tdep.c (examine_prologue): Deal with OR instructions

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that shuffle parameters into other regs.
* symtab.c (decode_line_1):  Fix bug introduced in Per's change
of Nov 12th.
This commit is contained in:
John Gilmore 1991-11-14 21:20:12 +00:00
parent 9dd0e793d7
commit 430923f3fa
2 changed files with 35 additions and 0 deletions
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7
gdb/ChangeLog
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@ -1,3 +1,10 @@
Thu Nov 14 13:18:25 1991 John Gilmore (gnu at cygnus.com)
* m88k-tdep.c (examine_prologue): Deal with OR instructions
that shuffle parameters into other regs.
* symtab.c (decode_line_1): Fix bug introduced in Per's change
of Nov 12th.
Wed Nov 13 19:51:11 1991 Steve Chamberlain (sac at cygnus.com)
* Makefile.in, xconfig/delta88 made it install a sysV manual page;

28
gdb/m88k-tdep.c
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@ -152,6 +152,8 @@ init_frame_pc (fromleaf, prev)
(addu r30,r31,n)? # frame pointer update
(pic sequence)? # PIC code prologue
(or rn,rm,0)? # Move parameters to other regs
*/
/* Macros for extracting fields from instructions. */
@ -333,6 +335,32 @@ examine_prologue (ip, limit, frame_sp, fsr, fi)
next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
}
/* Accept moves of parameter registers to other registers, using
"or rd,rs,0" or "or.u rd,rs,0" or "or rd,r0,rs" or "or rd,rs,r0".
We don't have to worry about walking into the first lines of code,
since the first line number will stop us (assuming we have symbols).
What gcc actually seems to produce is "or rd,r0,rs". */
#define OR_MOVE_INSN 0x58000000 /* or/or.u with immed of 0 */
#define OR_MOVE_MASK 0xF800FFFF
#define OR_REG_MOVE1_INSN 0xF4005800 /* or rd,r0,rs */
#define OR_REG_MOVE1_MASK 0xFC1FFFE0
#define OR_REG_MOVE2_INSN 0xF4005800 /* or rd,rs,r0 */
#define OR_REG_MOVE2_MASK 0xFC00FFFF
while (next_ip &&
((insn1 & OR_MOVE_MASK) == OR_MOVE_INSN ||
(insn1 & OR_REG_MOVE1_MASK) == OR_REG_MOVE1_INSN ||
(insn1 & OR_REG_MOVE2_MASK) == OR_REG_MOVE2_INSN
)
)
{
/* We don't care what moves to where. The result of the moves
has already been reflected in what the compiler tells us is the
location of these parameters. */
ip = next_ip;
next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
}
/* We're done with the prologue. If we don't care about the stack
frame itself, just return. (Note that fsr->regs has been trashed,
but the one caller who calls with fi==0 passes a dummy there.) */