@
@ Enable the alignment trap while in kernel mode
@
- alignment_trap r0
+ alignment_trap r0, .LCcralign
@
@ Clear FP to mark the first stack frame
@
adr r9, BSYM(ret_from_exception)
+ @ IRQs must be enabled before attempting to read the instruction from
+ @ user space since that could cause a page/translation fault if the
+ @ page table was modified by another CPU.
+ enable_irq
+
tst r3, #PSR_T_BIT @ Thumb mode?
bne __und_usr_thumb
sub r4, r2, #4 @ ARM instr at LR - 4
*/
.pushsection .fixup, "ax"
.align 2
-4: mov pc, r9
+4: str r4, [sp, #S_PC] @ retry current instruction
+ mov pc, r9
.popsection
.pushsection __ex_table,"a"
.long 1b, 4b
* r9 = normal "successful" return address
* r10 = this threads thread_info structure
* lr = unrecognised instruction return address
- * IRQs disabled, FIQs enabled.
+ * IRQs enabled, FIQs enabled.
*/
@
@ Fall-through from Thumb-2 __und_usr
#endif
do_fpe:
- enable_irq
ldr r4, .LCfp
add r10, r10, #TI_FPSTATE @ r10 = workspace
ldr pc, [r4] @ Call FP module USR entry point
b 1f
__und_usr_fault_16:
mov r1, #2
-1: enable_irq
- mov r0, sp
+1: mov r0, sp
adr lr, BSYM(ret_from_exception)
b __und_fault
ENDPROC(__und_usr_fault_32)
.data
.globl cr_alignment
- .globl cr_no_alignment
cr_alignment:
.space 4
-cr_no_alignment:
- .space 4
#ifdef CONFIG_MULTI_IRQ_HANDLER
.globl handle_arch_irq