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| author | Huacai Chen <chenhc@lemote.com> | 2020-09-21 17:12:28 +0800 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2020-09-21 22:15:22 +0200 |
| commit | bc1c969f1158485f64e360659f755d19136bb5b0 (patch) | |
| tree | d9e0e0f9a5fdd6cc021b5134af8280fdf66d8c47 /arch/mips | |
| parent | 195615ecc8309082a524433cf552eda722b26c1c (diff) | |
| download | linux-stable-bc1c969f1158485f64e360659f755d19136bb5b0.tar.gz linux-stable-bc1c969f1158485f64e360659f755d19136bb5b0.tar.bz2 linux-stable-bc1c969f1158485f64e360659f755d19136bb5b0.zip | |
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>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/kernel/process.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index b36297ee2b37..37f05c8605c2 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -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 } |