diff options
| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-02-09 19:29:28 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 23:35:12 +1100 |
| commit | d524dda719f06967db4d3ba519edf9267f84c155 (patch) | |
| tree | 91120a551f132ba10a5a711b2a01bc452d7380af /arch/powerpc/include | |
| parent | powerpc/syscall: Do not check unsupported scv vector on PPC32 (diff) | |
| download | linux-dev-d524dda719f06967db4d3ba519edf9267f84c155.tar.xz linux-dev-d524dda719f06967db4d3ba519edf9267f84c155.zip | |
powerpc/32: Handle bookE debugging in C in syscall entry/exit
The handling of SPRN_DBCR0 and other registers can easily
be done in C instead of ASM.
For that, create booke_load_dbcr0() and booke_restore_dbcr0().
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1a7515f9258b27a9177de88491a8bb79b255ceb7.1612898425.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/interrupt.h | 12 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/reg_booke.h | 3 |
2 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h index 5c285592d9b6..aedfba29e43a 100644 --- a/arch/powerpc/include/asm/interrupt.h +++ b/arch/powerpc/include/asm/interrupt.h @@ -15,6 +15,18 @@ struct interrupt_state { #endif }; +static inline void booke_restore_dbcr0(void) +{ +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + unsigned long dbcr0 = current->thread.debug.dbcr0; + + if (IS_ENABLED(CONFIG_PPC32) && unlikely(dbcr0 & DBCR0_IDM)) { + mtspr(SPRN_DBSR, -1); + mtspr(SPRN_DBCR0, global_dbcr0[smp_processor_id()]); + } +#endif +} + static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) { /* diff --git a/arch/powerpc/include/asm/reg_booke.h b/arch/powerpc/include/asm/reg_booke.h index 262782f08fd4..17b8dcd9a40d 100644 --- a/arch/powerpc/include/asm/reg_booke.h +++ b/arch/powerpc/include/asm/reg_booke.h @@ -691,6 +691,9 @@ #define mttmr(rn, v) asm volatile(MTTMR(rn, %0) : \ : "r" ((unsigned long)(v)) \ : "memory") + +extern unsigned long global_dbcr0[]; + #endif /* !__ASSEMBLY__ */ #endif /* __ASM_POWERPC_REG_BOOKE_H__ */ |