diff options
Diffstat (limited to 'arch/arm/nwfpe/entry.S')
| -rw-r--r-- | arch/arm/nwfpe/entry.S | 35 |
1 files changed, 20 insertions, 15 deletions
diff --git a/arch/arm/nwfpe/entry.S b/arch/arm/nwfpe/entry.S index 1dc13bc6d81..d18dde95b8a 100644 --- a/arch/arm/nwfpe/entry.S +++ b/arch/arm/nwfpe/entry.S @@ -20,6 +20,8 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#include <asm/opcodes.h> + /* This is the kernel's entry point into the floating point emulator. It is called from the kernel with code similar to this: @@ -70,13 +72,24 @@ floating point instructions. GCC attempts to group floating point instructions to allow the emulator to spread the cost of the trap over several floating point instructions. */ +#include <asm/asm-offsets.h> + .globl nwfpe_enter nwfpe_enter: mov r4, lr @ save the failure-return addresses mov sl, sp @ we access the registers via 'sl' - ldr r5, [sp, #60] @ get contents of PC; + ldr r5, [sp, #S_PC] @ get contents of PC; + mov r6, r0 @ save the opcode emulate: + ldr r1, [sp, #S_PSR] @ fetch the PSR + bl arm_check_condition @ check the condition + cmp r0, #ARM_OPCODE_CONDTEST_PASS @ condition passed? + + @ if condition code failed to match, next insn + bne next @ get the next instruction; + + mov r0, r6 @ prepare for EmulateAll() bl EmulateAll @ emulate the instruction cmp r0, #0 @ was emulation successful moveq pc, r4 @ no, return failure @@ -91,29 +104,21 @@ next: teqne r2, #0x0E000000 movne pc, r9 @ return ok if not a fp insn - str r5, [sp, #60] @ update PC copy in regs + str r5, [sp, #S_PC] @ update PC copy in regs mov r0, r6 @ save a copy - ldr r1, [sp, #64] @ fetch the condition codes - bl checkCondition @ check the condition - cmp r0, #0 @ r0 = 0 ==> condition failed - - @ if condition code failed to match, next insn - beq next @ get the next instruction; - - mov r0, r6 @ prepare for EmulateAll() - b emulate @ if r0 != 0, goto EmulateAll + b emulate @ check condition and emulate @ We need to be prepared for the instructions at .Lx1 and .Lx2 @ to fault. Emit the appropriate exception gunk to fix things up. @ ??? For some reason, faults can happen at .Lx2 even with a @ plain LDR instruction. Weird, but it seems harmless. - .section .fixup,"ax" + .pushsection .fixup,"ax" .align 2 .Lfix: mov pc, r9 @ let the user eat segfaults - .previous + .popsection - .section __ex_table,"a" + .pushsection __ex_table,"a" .align 3 .long .Lx1, .Lfix - .previous + .popsection |