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* h8300-tdep.c: Remove some outdated comments.

Browse source 
(h8300_skip_prologue): Rework to be more correct for the H8/300H.
        Handle stm.l insns for the H8/S.
        (examine_prologue): Likewise.
HMSE stuff.
This commit is contained in:
Jeff Law 1996-07-10 04:44:23 +00:00
parent 3128726ccd
commit 4679717d34
2 changed files with 87 additions and 34 deletions
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7
gdb/ChangeLog
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@ -1,3 +1,10 @@
Tue Jul 9 22:41:12 1996 Jeffrey A Law (law@cygnus.com)
* h8300-tdep.c: Remove some outdated comments.
(h8300_skip_prologue): Rework to be more correct for the H8/300H.
Handle stm.l insns for the H8/S.
(examine_prologue): Likewise.
Tue Jul 9 16:48:55 1996 Raymond Jou <rjou@mexican.cygnus.com>
* ser-mac.c (mac_close): Change a typo SetSetBuf to SerSetBuf.

114
gdb/h8300-tdep.c
View file

@ -39,15 +39,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#define UNSIGNED_SHORT(X) ((X) & 0xffff)
/* an easy to debug H8 stack frame looks like:
0x6df6 push r6
0x0d76 mov.w r7,r6
0x6dfn push reg
0x7905 nnnn mov.w #n,r5 or 0x1b87 subs #2,sp
0x1957 sub.w r5,sp
*/
#define IS_PUSH(x) ((x & 0xfff0)==0x6df0)
#define IS_PUSH_FP(x) (x == 0x6df6)
#define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6)
@ -71,47 +62,66 @@ h8300_skip_prologue (start_pc)
short int w;
int adjust = 0;
/* Skip past all push and stm insns. */
while (1)
{
w = read_memory_unsigned_integer (start_pc, 2);
/* First look for push insns. */
if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130)
{
w = read_memory_unsigned_integer (start_pc + 2, 2);
adjust = 2;
}
if (IS_PUSH (w))
{
start_pc += 2 + adjust;
w = read_memory_unsigned_integer (start_pc, 2);
continue;
}
adjust = 0;
break;
}
/* Skip past a move to FP, either word or long sized */
w = read_memory_unsigned_integer (start_pc, 2);
if (w == 0x0100)
{
w = read_memory_unsigned_integer (start_pc + 2, 2);
adjust = 2;
adjust += 2;
}
/* Skip past all push insns */
while (IS_PUSH_FP (w))
if (IS_MOVE_FP (w))
{
start_pc += 2 + adjust;
w = read_memory_unsigned_integer (start_pc, 2);
}
/* Skip past a move to FP */
if (IS_MOVE_FP (w))
{
start_pc += 2;
w = read_memory_unsigned_integer (start_pc, 2);
}
/* Skip the stack adjust */
/* Check for loading either a word constant into r5;
long versions are handled by the SUBL_SP below. */
if (IS_MOVK_R5 (w))
{
start_pc += 2;
w = read_memory_unsigned_integer (start_pc, 2);
}
/* Now check for subtracting r5 from sp, word sized only. */
if (IS_SUB_R5SP (w))
{
start_pc += 2;
w = read_memory_unsigned_integer (start_pc, 2);
}
while (IS_SUB2_SP (w) || IS_SUB4_SP (w))
{
start_pc += 2;
start_pc += 2 + adjust;
w = read_memory_unsigned_integer (start_pc, 2);
}
/* Check for subs #2 and subs #4. */
while (IS_SUB2_SP (w) || IS_SUB4_SP (w))
{
start_pc += 2 + adjust;
w = read_memory_unsigned_integer (start_pc, 2);
}
/* Check for a 32bit subtract. */
if (IS_SUBL_SP (w))
start_pc += 6;
start_pc += 6 + adjust;
return start_pc;
}
@ -251,6 +261,8 @@ examine_prologue (ip, limit, after_prolog_fp, fsr, fi)
{
after_prolog_fp = read_register (SP_REGNUM);
}
/* If the PC isn't valid, quit now. */
if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff))
return 0;
@ -314,13 +326,47 @@ examine_prologue (ip, limit, after_prolog_fp, fsr, fi)
}
}
/* Work out which regs are stored where */
while (next_ip && IS_PUSH (insn_word))
/* Now examine the push insns to determine where everything lives
on the stack. */
while (1)
{
ip = next_ip;
next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
fsr->regs[r] = after_prolog_fp + auto_depth;
auto_depth += 2;
adjust = 0;
if (!next_ip)
break;
if (insn_word == 0x0100)
{
ip = next_ip;
next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
adjust = 2;
}
if (IS_PUSH (insn_word))
{
ip = next_ip;
next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
fsr->regs[r] = after_prolog_fp + auto_depth;
auto_depth += 2 + adjust;
continue;
}
/* Now check for push multiple insns. */
if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130)
{
int count = ((insn_word >> 4) & 0xf) + 1;
int start, i;
ip = next_ip;
next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
start = insn_word & 0x7;
for (i = start; i <= start + count; i++)
{
fsr->regs[i] = after_prolog_fp + auto_depth;
auto_depth += 4;
}
}
break;
}
/* The args are always reffed based from the stack pointer */