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authorTC Wan2010-12-17 09:59:03 +0800
committerTC Wan2010-12-17 09:59:03 +0800
commita097bcca3e556df8d2c473016cf3734bb9defdb8 (patch)
tree6b66950785bbfd03105e629b43c84eeea31c948c /AT91SAM7S256/armdebug/Debugger/undef_handler.S
parent2e32cda30ad266069ecb9b8c93229b0269ba1547 (diff)
parente3a7c6a9da89b96f2b7026e71d8e3beb1f5bd140 (diff)
Merge branch 'master' of ssh://svc.cs.usm.my/~/gitrepo-bare/armdebug
Diffstat (limited to 'AT91SAM7S256/armdebug/Debugger/undef_handler.S')
-rw-r--r--AT91SAM7S256/armdebug/Debugger/undef_handler.S3
1 files changed, 2 insertions, 1 deletions
diff --git a/AT91SAM7S256/armdebug/Debugger/undef_handler.S b/AT91SAM7S256/armdebug/Debugger/undef_handler.S
index 61b8a5d..34154f7 100644
--- a/AT91SAM7S256/armdebug/Debugger/undef_handler.S
+++ b/AT91SAM7S256/armdebug/Debugger/undef_handler.S
@@ -35,7 +35,8 @@ undef_handler:
On entry, LR_undef points to one instruction past the UNDEF instruction
*/
ldr sp, =__debugger_stack__
- stmfd sp, {r0-r15}^ /* Save workspace, user mode's pc via 'S' flag */
+ stmfd sp, {r0-r15}^ /* Save workspace, user mode's pc via 'S' flag, R15: placeholder */
+ str lr, [sp, #-4] /* Keep User's Next Instr Pointer (in UNDEF SP) in user mode R15 */
sub sp, sp, #(4*16) /* Need to manually update SP(undef) */
mrs r1, spsr /* Copy SPSR to r0 */
tst r1, #CPSR_THUMB /* Check for Thumb Mode */