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Kernel/ARM: faster context save

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This commit is contained in:
Thomas Veerman 2013-01-25 14:41:43 +01:00
parent fb4b3da7da
commit df0c35f0f5
1 changed files with 7 additions and 9 deletions
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16
kernel/arch/earm/mpx.S
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@ -61,15 +61,13 @@ IMPORT(svc_stack)
/* Save the register context to the proc structure */
.macro save_process_ctx
push {lr}
ldr lr, [sp, #12] /* proc ptr */
stm lr, {r0-r14}^
ldr r12, [sp, #8]
str r12, [lr, #PSREG]
ldr r12, [sp, #4]
str r12, [lr, #PCREG]
pop {lr}
add sp, sp, #8
add sp, sp, #8 /* srsdb pushed cpsr and pc on the stack */
ldr lr, [sp] /* lr = proc_ptr */
stm lr, {r0-r14}^ /* proc_ptr->p_reg.r0-r14 = r0-r14 */
ldr r12, [sp, #-8] /* r12 = pc stored on the stack */
str r12, [lr, #PCREG] /* proc_ptr->p_reg.pc = r12 */
ldr r12, [sp, #-4] /* r12 = cpsr stored on the stack */
str r12, [lr, #PSREG] /* proc_ptr->p_reg.psr = r12 */
.endm
.macro exception_handler exc_name, exc_num, lr_offset