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authorFranck Bui-Huu <vagabon.xyz@gmail.com>2006-08-03 09:29:15 +0200
committerRalf Baechle <ralf@linux-mips.org>2006-09-27 13:37:24 +0100
commitc0efbb6dc2726785482d85a284c883d541a6e0be (patch)
tree786a13988605f27fc38d1f11ab555c361cc96a92 /arch/mips/kernel/process.c
parentdf586d59a4f069bb60a94ff4e5b64fe5c876f72c (diff)
downloadblackbird-op-linux-c0efbb6dc2726785482d85a284c883d541a6e0be.tar.gz
blackbird-op-linux-c0efbb6dc2726785482d85a284c883d541a6e0be.zip
[MIPS] Make get_frame_info() more readable.
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>
Diffstat (limited to 'arch/mips/kernel/process.c')
-rw-r--r--arch/mips/kernel/process.c67
1 files changed, 36 insertions, 31 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 8709a46a45c1..93d5432759db 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -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 =
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