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MIPS: Calculate microMIPS ra properly when unwinding the stack

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am: cc387ae089

Change-Id: Ic8e08f715b0137db795069024c05dbbdcba65355
This commit is contained in:
Paul Burton
2017-03-12 08:12:19 +00:00
committed by android-build-merger
parent dfba5f8f76 cc387ae089
commit 378772df95
1 changed files with 63 additions and 20 deletions
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83
arch/mips/kernel/process.c
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@@ -191,7 +191,7 @@ struct mips_frame_info {
#define J_TARGET(pc,target) \
(((unsigned long)(pc) & 0xf0000000) | ((target) << 2))
static inline int is_ra_save_ins(union mips_instruction *ip)
static inline int is_ra_save_ins(union mips_instruction *ip, int *poff)
{
#ifdef CONFIG_CPU_MICROMIPS
/*
@@ -204,25 +204,70 @@ static inline int is_ra_save_ins(union mips_instruction *ip)
* microMIPS is way more fun...
*/
if (mm_insn_16bit(ip->halfword[1])) {
return (ip->mm16_r5_format.opcode == mm_swsp16_op &&
ip->mm16_r5_format.rt == 31) ||
(ip->mm16_m_format.opcode == mm_pool16c_op &&
ip->mm16_m_format.func == mm_swm16_op);
switch (ip->mm16_r5_format.opcode) {
case mm_swsp16_op:
if (ip->mm16_r5_format.rt != 31)
return 0;
*poff = ip->mm16_r5_format.simmediate;
*poff = (*poff << 2) / sizeof(ulong);
return 1;
case mm_pool16c_op:
switch (ip->mm16_m_format.func) {
case mm_swm16_op:
*poff = ip->mm16_m_format.imm;
*poff += 1 + ip->mm16_m_format.rlist;
*poff = (*poff << 2) / sizeof(ulong);
return 1;
default:
return 0;
}
default:
return 0;
}
}
else {
return (ip->mm_m_format.opcode == mm_pool32b_op &&
ip->mm_m_format.rd > 9 &&
ip->mm_m_format.base == 29 &&
ip->mm_m_format.func == mm_swm32_func) ||
(ip->i_format.opcode == mm_sw32_op &&
ip->i_format.rs == 29 &&
ip->i_format.rt == 31);
switch (ip->i_format.opcode) {
case mm_sw32_op:
if (ip->i_format.rs != 29)
return 0;
if (ip->i_format.rt != 31)
return 0;
*poff = ip->i_format.simmediate / sizeof(ulong);
return 1;
case mm_pool32b_op:
switch (ip->mm_m_format.func) {
case mm_swm32_func:
if (ip->mm_m_format.rd < 0x10)
return 0;
if (ip->mm_m_format.base != 29)
return 0;
*poff = ip->mm_m_format.simmediate;
*poff += (ip->mm_m_format.rd & 0xf) * sizeof(u32);
*poff /= sizeof(ulong);
return 1;
default:
return 0;
}
default:
return 0;
}
#else
/* 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;
if ((ip->i_format.opcode == sw_op || ip->i_format.opcode == sd_op) &&
ip->i_format.rs == 29 && ip->i_format.rt == 31) {
*poff = ip->i_format.simmediate / sizeof(ulong);
return 1;
}
return 0;
#endif
}
@@ -345,11 +390,9 @@ static int get_frame_info(struct mips_frame_info *info)
}
continue;
}
if (info->pc_offset == -1 && is_ra_save_ins(&insn)) {
info->pc_offset =
ip->i_format.simmediate / sizeof(long);
if (info->pc_offset == -1 &&
is_ra_save_ins(&insn, &info->pc_offset))
break;
}
}
if (info->frame_size && info->pc_offset >= 0) /* nested */
return 0;