[ARM] VFP: fix section mismatch error

Fix a real section mismatch issue; the test code is thrown away after
initialisation, but if we do not detect the VFP hardware, it is left
hooked into the exception handler.  Any VFP instructions which are
subsequently executed risk calling the discarded exception handler.

Introduce a new "null" handler which returns to the "unrecognised
fault" return address.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-06-10 12:22:20 +01:00 committed by Russell King
parent 845a2fdcbd
commit 5d4cae5fe2
3 changed files with 12 additions and 1 deletions

View File

@ -29,6 +29,10 @@ do_vfp:
add r10, r10, #TI_VFPSTATE @ r10 = workspace
ldr pc, [r4] @ call VFP entry point
ENTRY(vfp_null_entry)
mov pc, lr
ENDPROC(vfp_null_entry)
.LCvfp:
.word vfp_vector

View File

@ -26,8 +26,9 @@
*/
void vfp_testing_entry(void);
void vfp_support_entry(void);
void vfp_null_entry(void);
void (*vfp_vector)(void) = vfp_testing_entry;
void (*vfp_vector)(void) = vfp_null_entry;
union vfp_state *last_VFP_context[NR_CPUS];
/*
@ -321,8 +322,10 @@ static int __init vfp_init(void)
* The handler is already setup to just log calls, so
* we just need to read the VFPSID register.
*/
vfp_vector = vfp_testing_entry;
vfpsid = fmrx(FPSID);
barrier();
vfp_vector = vfp_null_entry;
printk(KERN_INFO "VFP support v0.3: ");
if (VFP_arch) {

View File

@ -4,4 +4,8 @@
#define __ALIGN .align 0
#define __ALIGN_STR ".align 0"
#define ENDPROC(name) \
.type name, %function; \
END(name)
#endif