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# This patch changes the thumb swi handling for any thumb swi with
# an immediate value != 0, those swis are mapped into the arm
# specific swis. This implements a thumb breakpoint swi.
--- linux-2.6.12.2/arch/arm/kernel/entry-common.S.orig 2005-09-19 12:48:42.323365573 -0700
+++ linux-2.6.12.2/arch/arm/kernel/entry-common.S 2005-09-19 13:31:19.004247358 -0700
@@ -137,8 +137,11 @@
*/
#ifdef CONFIG_ARM_THUMB
tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
- addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in
- ldreq scno, [lr, #-4]
+ ldrneh ip, [lr, #-2] @ thumb swi instruction
+ ldreq scno, [lr, #-4] @ arm swi instruction
+ addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in to thumb r7 value
+ bicnes ip, ip, #0xff00 @ clear thumb swi bits
+ addne scno, ip, #__ARM_NR_BASE @ thumb swi0->r7, swi!0->arm swi
#else
ldr scno, [lr, #-4] @ get SWI instruction
#endif
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