diff options
Diffstat (limited to 'arch/arm/kernel/entry-header.S')
| -rw-r--r-- | arch/arm/kernel/entry-header.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S index d523cd8439a3..0f07579af472 100644 --- a/arch/arm/kernel/entry-header.S +++ b/arch/arm/kernel/entry-header.S @@ -300,6 +300,8 @@ mov r2, sp ldr r1, [r2, #\offset + S_PSR] @ get calling cpsr ldr lr, [r2, #\offset + S_PC]! @ get pc + tst r1, #PSR_I_BIT | 0x0f + bne 1f msr spsr_cxsf, r1 @ save in spsr_svc #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_32v6K) @ We must avoid clrex due to Cortex-A15 erratum #830321 @@ -314,6 +316,7 @@ @ after ldm {}^ add sp, sp, #\offset + PT_REGS_SIZE movs pc, lr @ return & move spsr_svc into cpsr +1: bug "Returning to usermode but unexpected PSR bits set?", \@ #elif defined(CONFIG_CPU_V7M) @ V7M restore. @ Note that we don't need to do clrex here as clearing the local @@ -329,6 +332,8 @@ ldr r1, [sp, #\offset + S_PSR] @ get calling cpsr ldr lr, [sp, #\offset + S_PC] @ get pc add sp, sp, #\offset + S_SP + tst r1, #PSR_I_BIT | 0x0f + bne 1f msr spsr_cxsf, r1 @ save in spsr_svc @ We must avoid clrex due to Cortex-A15 erratum #830321 @@ -341,6 +346,7 @@ .endif add sp, sp, #PT_REGS_SIZE - S_SP movs pc, lr @ return & move spsr_svc into cpsr +1: bug "Returning to usermode but unexpected PSR bits set?", \@ #endif /* !CONFIG_THUMB2_KERNEL */ .endm |