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| author | Catalin Marinas <catalin.marinas@arm.com> | 2009-09-18 23:27:07 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2009-09-18 23:30:11 +0100 |
| commit | 83e686ea0291ee93b87dcdc00b96443b80de56c9 (patch) | |
| tree | 7c0adedcdb2a5838bc734ce6cf84a65563ea8c7a /arch/arm/kernel/entry-armv.S | |
| parent | 74109b8913277b1dbd072039d1e0a930d2834389 (diff) | |
| download | linux-83e686ea0291ee93b87dcdc00b96443b80de56c9.tar.bz2 | |
Thumb-2: Correctly handle undefined instructions in the kernel
VFP instructions in the kernel may trigger undefined exceptions if VFP
hardware is not present. This patch corrects the loading of such Thumb-2
instructions. It also marks the "no_fp" label as a function so that the
linker generate a Thumb address.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/kernel/entry-armv.S')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index a332bc7225bf..0a2ba51cf35d 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -272,7 +272,15 @@ __und_svc: @ @ r0 - instruction @ +#ifndef CONFIG_THUMB2_KERNEL ldr r0, [r2, #-4] +#else + ldrh r0, [r2, #-2] @ Thumb instruction at LR - 2 + and r9, r0, #0xf800 + cmp r9, #0xe800 @ 32-bit instruction if xx >= 0 + ldrhhs r9, [r2] @ bottom 16 bits + orrhs r0, r9, r0, lsl #16 +#endif adr r9, BSYM(1f) bl call_fpe @@ -678,7 +686,9 @@ ENTRY(fp_enter) .word no_fp .previous -no_fp: mov pc, lr +ENTRY(no_fp) + mov pc, lr +ENDPROC(no_fp) __und_usr_unknown: enable_irq |