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[MIPS] Make get_frame_info() more readable.

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Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Franck Bui-Huu 2006-08-03 09:29:15 +02:00 committed by Ralf Baechle
parent df586d59a4
commit c0efbb6dc2
1 changed files with 36 additions and 31 deletions
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67
arch/mips/kernel/process.c
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@ -281,48 +281,53 @@ static struct mips_frame_info {
} *schedule_frame, mfinfo[64];
static int mfinfo_num;
static inline int is_ra_save_ins(union mips_instruction *ip)
{
/* sw / sd $ra, offset($sp) */
return (ip->i_format.opcode == sw_op || ip->i_format.opcode == sd_op) &&
ip->i_format.rs == 29 &&
ip->i_format.rt == 31;
}
static inline int is_jal_jalr_jr_ins(union mips_instruction *ip)
{
if (ip->j_format.opcode == jal_op)
return 1;
if (ip->r_format.opcode != spec_op)
return 0;
return ip->r_format.func == jalr_op || ip->r_format.func == jr_op;
}
static inline int is_sp_move_ins(union mips_instruction *ip)
{
/* addiu/daddiu sp,sp,-imm */
if (ip->i_format.rs != 29 || ip->i_format.rt != 29)
return 0;
if (ip->i_format.opcode == addiu_op || ip->i_format.opcode == daddiu_op)
return 1;
return 0;
}
static int get_frame_info(struct mips_frame_info *info)
{
int i;
void *func = info->func;
union mips_instruction *ip = (union mips_instruction *)func;
union mips_instruction *ip = info->func;
int i, max_insns =
min(128UL, info->func_size / sizeof(union mips_instruction));
info->pc_offset = -1;
info->frame_size = 0;
for (i = 0; i < 128; i++, ip++) {
/* if jal, jalr, jr, stop. */
if (ip->j_format.opcode == jal_op ||
(ip->r_format.opcode == spec_op &&
(ip->r_format.func == jalr_op ||
ip->r_format.func == jr_op)))
break;
if (info->func_size && i >= info->func_size / 4)
for (i = 0; i < max_insns; i++, ip++) {
if (is_jal_jalr_jr_ins(ip))
break;
if (
#ifdef CONFIG_32BIT
ip->i_format.opcode == addiu_op &&
#endif
#ifdef CONFIG_64BIT
ip->i_format.opcode == daddiu_op &&
#endif
ip->i_format.rs == 29 &&
ip->i_format.rt == 29) {
/* addiu/daddiu sp,sp,-imm */
if (is_sp_move_ins(ip)) {
if (info->frame_size)
continue;
info->frame_size = - ip->i_format.simmediate;
}
if (
#ifdef CONFIG_32BIT
ip->i_format.opcode == sw_op &&
#endif
#ifdef CONFIG_64BIT
ip->i_format.opcode == sd_op &&
#endif
ip->i_format.rs == 29 &&
ip->i_format.rt == 31) {
/* sw / sd $ra, offset($sp) */
if (is_ra_save_ins(ip)) {
if (info->pc_offset != -1)
continue;
info->pc_offset =