diff options
Diffstat (limited to 'arch/arm/kernel/entry-armv.S')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 111 |
1 files changed, 73 insertions, 38 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index a46d5b456765..7dca225752c1 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -166,12 +166,12 @@ __dabt_svc: @ The abort handler must return the aborted address in r0, and @ the fault status register in r1. r9 must be preserved. @ -#ifdef MULTI_ABORT +#ifdef MULTI_DABORT ldr r4, .LCprocfns mov lr, pc - ldr pc, [r4] + ldr pc, [r4, #PROCESSOR_DABT_FUNC] #else - bl CPU_ABORT_HANDLER + bl CPU_DABORT_HANDLER #endif @ @@ -209,14 +209,12 @@ __irq_svc: irq_handler #ifdef CONFIG_PREEMPT + str r8, [tsk, #TI_PREEMPT] @ restore preempt count ldr r0, [tsk, #TI_FLAGS] @ get flags + teq r8, #0 @ if preempt count != 0 + movne r0, #0 @ force flags to 0 tst r0, #_TIF_NEED_RESCHED blne svc_preempt -preempt_return: - ldr r0, [tsk, #TI_PREEMPT] @ read preempt value - str r8, [tsk, #TI_PREEMPT] @ restore preempt count - teq r0, r7 - strne r0, [r0, -r0] @ bug() #endif ldr r0, [sp, #S_PSR] @ irqs are already disabled msr spsr_cxsf, r0 @@ -230,19 +228,11 @@ preempt_return: #ifdef CONFIG_PREEMPT svc_preempt: - teq r8, #0 @ was preempt count = 0 - ldreq r6, .LCirq_stat - movne pc, lr @ no - ldr r0, [r6, #4] @ local_irq_count - ldr r1, [r6, #8] @ local_bh_count - adds r0, r0, r1 - movne pc, lr - mov r7, #0 @ preempt_schedule_irq - str r7, [tsk, #TI_PREEMPT] @ expects preempt_count == 0 + mov r8, lr 1: bl preempt_schedule_irq @ irq en/disable is done inside ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS tst r0, #_TIF_NEED_RESCHED - beq preempt_return @ go again + moveq pc, r8 @ go again b 1b #endif @@ -293,7 +283,6 @@ __pabt_svc: mrs r9, cpsr tst r3, #PSR_I_BIT biceq r9, r9, #PSR_I_BIT - msr cpsr_c, r9 @ @ set args, then call main handler @@ -301,7 +290,15 @@ __pabt_svc: @ r0 - address of faulting instruction @ r1 - pointer to registers on stack @ - mov r0, r2 @ address (pc) +#ifdef MULTI_PABORT + mov r0, r2 @ pass address of aborted instruction. + ldr r4, .LCprocfns + mov lr, pc + ldr pc, [r4, #PROCESSOR_PABT_FUNC] +#else + CPU_PABORT_HANDLER(r0, r2) +#endif + msr cpsr_c, r9 @ Maybe enable interrupts mov r1, sp @ regs bl do_PrefetchAbort @ call abort handler @@ -320,16 +317,12 @@ __pabt_svc: .align 5 .LCcralign: .word cr_alignment -#ifdef MULTI_ABORT +#ifdef MULTI_DABORT .LCprocfns: .word processor #endif .LCfp: .word fp_enter -#ifdef CONFIG_PREEMPT -.LCirq_stat: - .word irq_stat -#endif /* * User mode handlers @@ -404,12 +397,12 @@ __dabt_usr: @ The abort handler must return the aborted address in r0, and @ the fault status register in r1. @ -#ifdef MULTI_ABORT +#ifdef MULTI_DABORT ldr r4, .LCprocfns mov lr, pc - ldr pc, [r4] + ldr pc, [r4, #PROCESSOR_DABT_FUNC] #else - bl CPU_ABORT_HANDLER + bl CPU_DABORT_HANDLER #endif @ @@ -455,10 +448,6 @@ __irq_usr: __und_usr: usr_entry - tst r3, #PSR_T_BIT @ Thumb mode? - bne __und_usr_unknown @ ignore FP - sub r4, r2, #4 - @ @ fall through to the emulation code, which returns using r9 if @ it has emulated the instruction, or the more conventional lr @@ -468,7 +457,24 @@ __und_usr: @ adr r9, ret_from_exception adr lr, __und_usr_unknown -1: ldrt r0, [r4] + tst r3, #PSR_T_BIT @ Thumb mode? + subeq r4, r2, #4 @ ARM instr at LR - 4 + subne r4, r2, #2 @ Thumb instr at LR - 2 +1: ldreqt r0, [r4] + beq call_fpe + @ Thumb instruction +#if __LINUX_ARM_ARCH__ >= 7 +2: ldrht r5, [r4], #2 + and r0, r5, #0xf800 @ mask bits 111x x... .... .... + cmp r0, #0xe800 @ 32bit instruction if xx != 0 + blo __und_usr_unknown +3: ldrht r0, [r4] + add r2, r2, #2 @ r2 is PC + 2, make it PC + 4 + orr r0, r0, r5, lsl #16 +#else + b __und_usr_unknown +#endif + @ @ fallthrough to call_fpe @ @@ -477,10 +483,14 @@ __und_usr: * The out of line fixup for the ldrt above. */ .section .fixup, "ax" -2: mov pc, r9 +4: mov pc, r9 .previous .section __ex_table,"a" - .long 1b, 2b + .long 1b, 4b +#if __LINUX_ARM_ARCH__ >= 7 + .long 2b, 4b + .long 3b, 4b +#endif .previous /* @@ -507,9 +517,16 @@ __und_usr: * r10 = this threads thread_info structure. * lr = unrecognised instruction return address */ + @ + @ Fall-through from Thumb-2 __und_usr + @ +#ifdef CONFIG_NEON + adr r6, .LCneon_thumb_opcodes + b 2f +#endif call_fpe: #ifdef CONFIG_NEON - adr r6, .LCneon_opcodes + adr r6, .LCneon_arm_opcodes 2: ldr r7, [r6], #4 @ mask value cmp r7, #0 @ end mask? @@ -526,6 +543,7 @@ call_fpe: 1: #endif tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27 + tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2 #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710) and r8, r0, #0x0f000000 @ mask out op-code bits teqne r8, #0x0f000000 @ SWI (ARM6/7 bug)? @@ -577,7 +595,7 @@ call_fpe: #ifdef CONFIG_NEON .align 6 -.LCneon_opcodes: +.LCneon_arm_opcodes: .word 0xfe000000 @ mask .word 0xf2000000 @ opcode @@ -586,6 +604,16 @@ call_fpe: .word 0x00000000 @ mask .word 0x00000000 @ opcode + +.LCneon_thumb_opcodes: + .word 0xef000000 @ mask + .word 0xef000000 @ opcode + + .word 0xff100000 @ mask + .word 0xf9000000 @ opcode + + .word 0x00000000 @ mask + .word 0x00000000 @ opcode #endif do_fpe: @@ -619,8 +647,15 @@ __und_usr_unknown: __pabt_usr: usr_entry +#ifdef MULTI_PABORT + mov r0, r2 @ pass address of aborted instruction. + ldr r4, .LCprocfns + mov lr, pc + ldr pc, [r4, #PROCESSOR_PABT_FUNC] +#else + CPU_PABORT_HANDLER(r0, r2) +#endif enable_irq @ Enable interrupts - mov r0, r2 @ address (pc) mov r1, sp @ regs bl do_PrefetchAbort @ call abort handler /* fall through */ |