Enable architectures, such as s390, which store SFrame CFA offset values encoded, to e.g. make (better) use of unsigned 8-bit SFrame offsets.
Signed-off-by: Jens Remus <[email protected]> --- Notes (jremus): Changes in RFC v2: - Rename generic_sframe_cfa_offset_decode() to sframe_cfa_offset_decode(). (Josh) include/asm-generic/unwind_user_sframe.h | 8 ++++++++ kernel/unwind/sframe.c | 1 + 2 files changed, 9 insertions(+) diff --git a/include/asm-generic/unwind_user_sframe.h b/include/asm-generic/unwind_user_sframe.h index 163961ca5252..80ae9bfaa88d 100644 --- a/include/asm-generic/unwind_user_sframe.h +++ b/include/asm-generic/unwind_user_sframe.h @@ -10,6 +10,14 @@ #define SFRAME_SP_OFFSET 0 #endif +#ifndef sframe_cfa_offset_decode +static inline s32 sframe_cfa_offset_decode(s32 offset) +{ + return offset; +} +#define sframe_cfa_offset_decode sframe_cfa_offset_decode +#endif + #ifndef sframe_init_reginfo static inline void sframe_init_reginfo(struct unwind_user_reginfo *reginfo, s32 offset) diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index 45cd7380ac38..92f770fc21f6 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -226,6 +226,7 @@ static __always_inline int __read_fre(struct sframe_section *sec, UNSAFE_GET_USER_INC(cfa_off, cur, offset_size, Efault); offset_count--; + cfa_off = sframe_cfa_offset_decode(cfa_off); ra_off = sec->ra_off; if (!ra_off && offset_count) { -- 2.51.0
