diff options
Diffstat (limited to 'arch/arm/vfp/vfphw.S')
| -rw-r--r-- | arch/arm/vfp/vfphw.S | 80 |
1 files changed, 44 insertions, 36 deletions
diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index 2d30c7f6edd..be807625ed8 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -14,19 +14,25 @@ * r10 points at the start of the private FP workspace in the thread structure * sp points to a struct pt_regs (as defined in include/asm/proc/ptrace.h) */ +#include <linux/init.h> +#include <linux/linkage.h> #include <asm/thread_info.h> #include <asm/vfpmacros.h> -#include "../kernel/entry-header.S" +#include <linux/kern_levels.h> +#include <asm/assembler.h> +#include <asm/asm-offsets.h> .macro DBGSTR, str #ifdef DEBUG stmfd sp!, {r0-r3, ip, lr} - add r0, pc, #4 + ldr r0, =1f bl printk - b 1f - .asciz "<7>VFP: \str\n" - .balign 4 -1: ldmfd sp!, {r0-r3, ip, lr} + ldmfd sp!, {r0-r3, ip, lr} + + .pushsection .rodata, "a" +1: .ascii KERN_DEBUG "VFP: \str\n" + .byte 0 + .previous #endif .endm @@ -34,12 +40,14 @@ #ifdef DEBUG stmfd sp!, {r0-r3, ip, lr} mov r1, \arg - add r0, pc, #4 + ldr r0, =1f bl printk - b 1f - .asciz "<7>VFP: \str\n" - .balign 4 -1: ldmfd sp!, {r0-r3, ip, lr} + ldmfd sp!, {r0-r3, ip, lr} + + .pushsection .rodata, "a" +1: .ascii KERN_DEBUG "VFP: \str\n" + .byte 0 + .previous #endif .endm @@ -49,28 +57,35 @@ mov r3, \arg3 mov r2, \arg2 mov r1, \arg1 - add r0, pc, #4 + ldr r0, =1f bl printk - b 1f - .asciz "<7>VFP: \str\n" - .balign 4 -1: ldmfd sp!, {r0-r3, ip, lr} + ldmfd sp!, {r0-r3, ip, lr} + + .pushsection .rodata, "a" +1: .ascii KERN_DEBUG "VFP: \str\n" + .byte 0 + .previous #endif .endm @ VFP hardware support entry point. @ -@ r0 = faulted instruction -@ r2 = faulted PC+4 -@ r9 = successful return +@ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb) +@ r2 = PC value to resume execution after successful emulation +@ r9 = normal "successful" return address @ r10 = vfp_state union @ r11 = CPU number -@ lr = failure return - +@ lr = unrecognised instruction return address +@ IRQs enabled. ENTRY(vfp_support_entry) DBGSTR3 "instr %08x pc %08x state %p", r0, r2, r10 + ldr r3, [sp, #S_PSR] @ Neither lazy restore nor FP exceptions + and r3, r3, #MODE_MASK @ are supported in kernel mode + teq r3, #USR_MODE + bne vfp_kmode_exception @ Returns through lr + VFPFMRX r1, FPEXC @ Is the VFP enabled? DBGSTR1 "fpexc %08x", r1 tst r1, #FPEXC_EN @@ -161,15 +176,13 @@ vfp_hw_state_valid: @ exception before retrying branch @ out before setting an FPEXC that @ stops us reading stuff - VFPFMXR FPEXC, r1 @ restore FPEXC last - sub r2, r2, #4 - str r2, [sp, #S_PC] @ retry the instruction -#ifdef CONFIG_PREEMPT - get_thread_info r10 - ldr r4, [r10, #TI_PREEMPT] @ get preempt count - sub r11, r4, #1 @ decrement it - str r11, [r10, #TI_PREEMPT] -#endif + VFPFMXR FPEXC, r1 @ Restore FPEXC last + sub r2, r2, #4 @ Retry current instruction - if Thumb + str r2, [sp, #S_PC] @ mode it's two 16-bit instructions, + @ else it's one 32-bit instruction, so + @ always subtract 4 from the following + @ instruction address. + dec_preempt_count_ti r10, r4 mov pc, r9 @ we think we have handled things @@ -188,12 +201,7 @@ look_for_VFP_exceptions: @ not recognised by VFP DBGSTR "not VFP" -#ifdef CONFIG_PREEMPT - get_thread_info r10 - ldr r4, [r10, #TI_PREEMPT] @ get preempt count - sub r11, r4, #1 @ decrement it - str r11, [r10, #TI_PREEMPT] -#endif + dec_preempt_count_ti r10, r4 mov pc, lr process_exception: |