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Thumb-2: Correctly handle undefined instructions in the kernel

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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>
This commit is contained in:
Catalin Marinas 2009-09-18 23:27:07 +01:00
parent 74109b8913
commit 83e686ea02
1 changed files with 11 additions and 1 deletions
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12
arch/arm/kernel/entry-armv.S
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@ -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