提交 9a955167 编写于 作者: P Paul Mackerras

powerpc: Rearrange head_64.S to move interrupt handler code to the beginning

This rearranges head_64.S so that we have all the first-level exception
prologs together starting at 0x100, followed by all the second-level
handlers that are invoked from the first-level prologs, followed by
other code.  This doesn't make any functional change but will make
following changes for relocatable kernel support easier.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
上级 cf00085d
......@@ -325,16 +325,32 @@ do_stab_bolted_pSeries:
mfspr r12,SPRN_SPRG2
EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
#ifdef CONFIG_PPC_PSERIES
/*
* Vectors for the FWNMI option. Share common code.
*/
.globl system_reset_fwnmi
.align 7
system_reset_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG1,r13 /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
.globl machine_check_fwnmi
.align 7
machine_check_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG1,r13 /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
#endif /* CONFIG_PPC_PSERIES */
#ifdef __DISABLED__
/*
* We have some room here we use that to put
* the peries slb miss user trampoline code so it's reasonably
* away from slb_miss_user_common to avoid problems with rfid
*
* This is used for when the SLB miss handler has to go virtual,
* which doesn't happen for now anymore but will once we re-implement
* dynamic VSIDs for shared page tables
*/
#ifdef __DISABLED__
slb_miss_user_pseries:
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R11(r13)
......@@ -357,25 +373,14 @@ slb_miss_user_pseries:
b . /* prevent spec. execution */
#endif /* __DISABLED__ */
#ifdef CONFIG_PPC_PSERIES
.align 7
.globl __end_interrupts
__end_interrupts:
/*
* Vectors for the FWNMI option. Share common code.
* Code from here down to __end_handlers is invoked from the
* exception prologs above.
*/
.globl system_reset_fwnmi
.align 7
system_reset_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG1,r13 /* save r13 */
EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXGEN, system_reset_common)
.globl machine_check_fwnmi
.align 7
machine_check_fwnmi:
HMT_MEDIUM
mtspr SPRN_SPRG1,r13 /* save r13 */
EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXMC, machine_check_common)
#endif /* CONFIG_PPC_PSERIES */
/*** Common interrupt handlers ***/
......@@ -456,65 +461,6 @@ bad_stack:
bl .kernel_bad_stack
b 1b
/*
* Return from an exception with minimal checks.
* The caller is assumed to have done EXCEPTION_PROLOG_COMMON.
* If interrupts have been enabled, or anything has been
* done that might have changed the scheduling status of
* any task or sent any task a signal, you should use
* ret_from_except or ret_from_except_lite instead of this.
*/
fast_exc_return_irq: /* restores irq state too */
ld r3,SOFTE(r1)
TRACE_AND_RESTORE_IRQ(r3);
ld r12,_MSR(r1)
rldicl r4,r12,49,63 /* get MSR_EE to LSB */
stb r4,PACAHARDIRQEN(r13) /* restore paca->hard_enabled */
b 1f
.globl fast_exception_return
fast_exception_return:
ld r12,_MSR(r1)
1: ld r11,_NIP(r1)
andi. r3,r12,MSR_RI /* check if RI is set */
beq- unrecov_fer
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
andi. r3,r12,MSR_PR
beq 2f
ACCOUNT_CPU_USER_EXIT(r3, r4)
2:
#endif
ld r3,_CCR(r1)
ld r4,_LINK(r1)
ld r5,_CTR(r1)
ld r6,_XER(r1)
mtcr r3
mtlr r4
mtctr r5
mtxer r6
REST_GPR(0, r1)
REST_8GPRS(2, r1)
mfmsr r10
rldicl r10,r10,48,1 /* clear EE */
rldicr r10,r10,16,61 /* clear RI (LE is 0 already) */
mtmsrd r10,1
mtspr SPRN_SRR1,r12
mtspr SPRN_SRR0,r11
REST_4GPRS(10, r1)
ld r1,GPR1(r1)
rfid
b . /* prevent speculative execution */
unrecov_fer:
bl .save_nvgprs
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl .unrecoverable_exception
b 1b
/*
* Here r13 points to the paca, r9 contains the saved CR,
* SRR0 and SRR1 are saved in r11 and r12,
......@@ -766,6 +712,85 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
bl .altivec_unavailable_exception
b .ret_from_except
.align 7
.globl vsx_unavailable_common
vsx_unavailable_common:
EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
bne .load_up_vsx
1:
END_FTR_SECTION_IFSET(CPU_FTR_VSX)
#endif
bl .save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
ENABLE_INTS
bl .vsx_unavailable_exception
b .ret_from_except
.align 7
.globl __end_handlers
__end_handlers:
/*
* Return from an exception with minimal checks.
* The caller is assumed to have done EXCEPTION_PROLOG_COMMON.
* If interrupts have been enabled, or anything has been
* done that might have changed the scheduling status of
* any task or sent any task a signal, you should use
* ret_from_except or ret_from_except_lite instead of this.
*/
fast_exc_return_irq: /* restores irq state too */
ld r3,SOFTE(r1)
TRACE_AND_RESTORE_IRQ(r3);
ld r12,_MSR(r1)
rldicl r4,r12,49,63 /* get MSR_EE to LSB */
stb r4,PACAHARDIRQEN(r13) /* restore paca->hard_enabled */
b 1f
.globl fast_exception_return
fast_exception_return:
ld r12,_MSR(r1)
1: ld r11,_NIP(r1)
andi. r3,r12,MSR_RI /* check if RI is set */
beq- unrecov_fer
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
andi. r3,r12,MSR_PR
beq 2f
ACCOUNT_CPU_USER_EXIT(r3, r4)
2:
#endif
ld r3,_CCR(r1)
ld r4,_LINK(r1)
ld r5,_CTR(r1)
ld r6,_XER(r1)
mtcr r3
mtlr r4
mtctr r5
mtxer r6
REST_GPR(0, r1)
REST_8GPRS(2, r1)
mfmsr r10
rldicl r10,r10,48,1 /* clear EE */
rldicr r10,r10,16,61 /* clear RI (LE is 0 already) */
mtmsrd r10,1
mtspr SPRN_SRR1,r12
mtspr SPRN_SRR0,r11
REST_4GPRS(10, r1)
ld r1,GPR1(r1)
rfid
b . /* prevent speculative execution */
unrecov_fer:
bl .save_nvgprs
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl .unrecoverable_exception
b 1b
#ifdef CONFIG_ALTIVEC
/*
* load_up_altivec(unused, unused, tsk)
......@@ -840,22 +865,6 @@ _STATIC(load_up_altivec)
blr
#endif /* CONFIG_ALTIVEC */
.align 7
.globl vsx_unavailable_common
vsx_unavailable_common:
EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
bne .load_up_vsx
1:
END_FTR_SECTION_IFSET(CPU_FTR_VSX)
#endif
bl .save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
ENABLE_INTS
bl .vsx_unavailable_exception
b .ret_from_except
#ifdef CONFIG_VSX
/*
* load_up_vsx(unused, unused, tsk)
......
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