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MIPS: Loongson-3: Calculate ra properly when unwinding the stack 

Loongson-3 has 16-bytes load/store instructions: gslq and gssq. This
patch calculate ra properly when unwinding the stack, if ra is saved
by gssq and restored by gslq.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Huacai Chen 2020-09-21 17:12:28 +08:00 committed by Thomas Bogendoerfer
parent 195615ecc8
commit bc1c969f11
1 changed files with 15 additions and 1 deletions
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16
arch/mips/kernel/process.c
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@ -279,7 +279,21 @@ static inline int is_ra_save_ins(union mips_instruction *ip, int *poff)
*poff = ip->i_format.simmediate / sizeof(ulong);
return 1;
}
#ifdef CONFIG_CPU_LOONGSON64
if ((ip->loongson3_lswc2_format.opcode == swc2_op) &&
(ip->loongson3_lswc2_format.ls == 1) &&
(ip->loongson3_lswc2_format.fr == 0) &&
(ip->loongson3_lswc2_format.base == 29)) {
if (ip->loongson3_lswc2_format.rt == 31) {
*poff = ip->loongson3_lswc2_format.offset << 1;
return 1;
}
if (ip->loongson3_lswc2_format.rq == 31) {
*poff = (ip->loongson3_lswc2_format.offset << 1) + 1;
return 1;
}
}
#endif
return 0;
#endif
}