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kernel: maintain stack alignment

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. 'fixes' 64-bit varargs (i.e. printf("%llu", ..)) argument
	  retrieval bug
This commit is contained in:
Ben Gras 2013-06-24 14:35:25 +02:00
parent 910825ee9b
commit bb268230c4
1 changed files with 2 additions and 0 deletions
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2
kernel/arch/earm/mpx.S
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@ -130,6 +130,7 @@ irq_entry_from_user:
ldr fp, [sp] ldr fp, [sp]
push {fp} /* save caller proc ptr */ push {fp} /* save caller proc ptr */
sub sp, sp, #4 /* maintain stack alignment */
/* stop user process cycles */ /* stop user process cycles */
mov r0, fp /* first param: caller proc ptr */ mov r0, fp /* first param: caller proc ptr */
@ -139,6 +140,7 @@ irq_entry_from_user:
/* call handler */ /* call handler */
bl _C_LABEL(omap3_irq_handle) /* omap3_irq_handle(void) */ bl _C_LABEL(omap3_irq_handle) /* omap3_irq_handle(void) */
add sp, sp, #4
pop {fp} /* caller proc ptr */ pop {fp} /* caller proc ptr */
/* data synchronization barrier */ /* data synchronization barrier */