diff options
Diffstat (limited to 'arch/arm/vfp/vfphw.S')
| -rw-r--r-- | arch/arm/vfp/vfphw.S | 60 |
1 files changed, 37 insertions, 23 deletions
diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index 0ac022f..353f9e5c 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -99,12 +99,12 @@ vfp_support_entry: DBGSTR1 "save old state %p", r4 cmp r4, #0 beq no_old_VFP_process + VFPFSTMIA r4, r5 @ save the working registers VFPFMRX r5, FPSCR @ current status - VFPFMRX r6, FPINST @ FPINST (always there, rev0 onwards) - tst r1, #FPEXC_FPV2 @ is there an FPINST2 to read? - VFPFMRX r8, FPINST2, NE @ FPINST2 if needed - avoids reading - @ nonexistant reg on rev0 - VFPFSTMIA r4 @ save the working registers + tst r1, #FPEXC_EX @ is there additional state to save? + VFPFMRX r6, FPINST, NE @ FPINST (only if FPEXC.EX is set) + tstne r1, #FPEXC_FP2V @ is there an FPINST2 to read? + VFPFMRX r8, FPINST2, NE @ FPINST2 if needed (and present) stmia r4, {r1, r5, r6, r8} @ save FPEXC, FPSCR, FPINST, FPINST2 @ and point r4 at the word at the @ start of the register dump @@ -114,13 +114,13 @@ no_old_VFP_process: DBGSTR1 "load state %p", r10 str r10, [r3, r11, lsl #2] @ update the last_VFP_context pointer @ Load the saved state back into the VFP - VFPFLDMIA r10 @ reload the working registers while + VFPFLDMIA r10, r5 @ reload the working registers while @ FPEXC is in a safe state ldmia r10, {r1, r5, r6, r8} @ load FPEXC, FPSCR, FPINST, FPINST2 - tst r1, #FPEXC_FPV2 @ is there an FPINST2 to write? - VFPFMXR FPINST2, r8, NE @ FPINST2 if needed - avoids writing - @ nonexistant reg on rev0 - VFPFMXR FPINST, r6 + tst r1, #FPEXC_EX @ is there additional state to restore? + VFPFMXR FPINST, r6, NE @ restore FPINST (only if FPEXC.EX is set) + tstne r1, #FPEXC_FP2V @ is there an FPINST2 to write? + VFPFMXR FPINST2, r8, NE @ FPINST2 if needed (and present) VFPFMXR FPSCR, r5 @ restore status check_for_exception: @@ -136,10 +136,14 @@ check_for_exception: look_for_VFP_exceptions: - tst r1, #FPEXC_EX + @ Check for synchronous or asynchronous exception + tst r1, #FPEXC_EX | FPEXC_DEX bne process_exception + @ On some implementations of the VFP subarch 1, setting FPSCR.IXE + @ causes all the CDP instructions to be bounced synchronously without + @ setting the FPEXC.EX bit VFPFMRX r5, FPSCR - tst r5, #FPSCR_IXE @ IXE doesn't set FPEXC_EX ! + tst r5, #FPSCR_IXE bne process_exception @ Fall into hand on to next handler - appropriate coproc instr @@ -150,10 +154,6 @@ look_for_VFP_exceptions: process_exception: DBGSTR "bounce" - sub r2, r2, #4 - str r2, [sp, #S_PC] @ retry the instruction on exit from - @ the imprecise exception handling in - @ the support code mov r2, sp @ nothing stacked - regdump is at TOS mov lr, r9 @ setup for a return to the user code. @@ -161,7 +161,7 @@ process_exception: @ r0 holds the trigger instruction @ r1 holds the FPEXC value @ r2 pointer to register dump - b VFP9_bounce @ we have handled this - the support + b VFP_bounce @ we have handled this - the support @ code will raise an exception if @ required. If not, the user code will @ retry the faulted instruction @@ -174,12 +174,12 @@ vfp_save_state: @ r0 - save location @ r1 - FPEXC DBGSTR1 "save VFP state %p", r0 + VFPFSTMIA r0, r2 @ save the working registers VFPFMRX r2, FPSCR @ current status - VFPFMRX r3, FPINST @ FPINST (always there, rev0 onwards) - tst r1, #FPEXC_FPV2 @ is there an FPINST2 to read? - VFPFMRX r12, FPINST2, NE @ FPINST2 if needed - avoids reading - @ nonexistant reg on rev0 - VFPFSTMIA r0 @ save the working registers + tst r1, #FPEXC_EX @ is there additional state to save? + VFPFMRX r3, FPINST, NE @ FPINST (only if FPEXC.EX is set) + tstne r1, #FPEXC_FP2V @ is there an FPINST2 to read? + VFPFMRX r12, FPINST2, NE @ FPINST2 if needed (and present) stmia r0, {r1, r2, r3, r12} @ save FPEXC, FPSCR, FPINST, FPINST2 mov pc, lr #endif @@ -217,8 +217,15 @@ vfp_get_double: fmrrd r0, r1, d\dr mov pc, lr .endr +#ifdef CONFIG_VFPv3 + @ d16 - d31 registers + .irp dr,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 + mrrc p11, 3, r0, r1, c\dr @ fmrrd r0, r1, d\dr + mov pc, lr + .endr +#endif - @ virtual register 16 for compare with zero + @ virtual register 16 (or 32 if VFPv3) for compare with zero mov r0, #0 mov r1, #0 mov pc, lr @@ -231,3 +238,10 @@ vfp_put_double: fmdrr d\dr, r0, r1 mov pc, lr .endr +#ifdef CONFIG_VFPv3 + @ d16 - d31 registers + .irp dr,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 + mcrr p11, 3, r1, r2, c\dr @ fmdrr r1, r2, d\dr + mov pc, lr + .endr +#endif |
