diff options
Diffstat (limited to 'arch/arm/vfp')
| -rw-r--r-- | arch/arm/vfp/entry.S | 16 | ||||
| -rw-r--r-- | arch/arm/vfp/vfphw.S | 19 |
2 files changed, 20 insertions, 15 deletions
diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S index 4fa9903b83cf..cc926c985981 100644 --- a/arch/arm/vfp/entry.S +++ b/arch/arm/vfp/entry.S @@ -7,18 +7,20 @@ * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. - * - * Basic entry code, called from the kernel's undefined instruction trap. - * r0 = faulted instruction - * r5 = faulted PC+4 - * r9 = successful return - * r10 = thread_info structure - * lr = failure return */ #include <asm/thread_info.h> #include <asm/vfpmacros.h> #include "../kernel/entry-header.S" +@ VFP entry point. +@ +@ 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 = this threads thread_info structure +@ lr = unrecognised instruction return address +@ IRQs disabled. +@ ENTRY(do_vfp) #ifdef CONFIG_PREEMPT ldr r4, [r10, #TI_PREEMPT] @ get preempt count diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index 2d30c7f6edd3..3a0efaad6090 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -61,13 +61,13 @@ @ 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 @@ -161,9 +161,12 @@ 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 + 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. #ifdef CONFIG_PREEMPT get_thread_info r10 ldr r4, [r10, #TI_PREEMPT] @ get preempt count |