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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-10-08 12:24:23 -0400
committerRalf Baechle <ralf@linux-mips.org>2006-10-09 18:20:46 -0400
commitf431baa55abf8adeed0c718b51deacbc151f58f1 (patch)
treefe0383328c1d8bcb0fae7e266a437b980a05a7f9 /arch/mips/kernel
parent441ee341ad63572f39cb8074e31806b5b1471d0b (diff)
[MIPS] ret_from_irq adjustment
Make sure that RA on top of interrupt stack is an address of ret_from_irq, so that dump_stack etc. can trace info interrupted context. Also this patch fixes except_vec_vi_handler and __smtc_ipi_vector which seems broken. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r--arch/mips/kernel/entry.S14
-rw-r--r--arch/mips/kernel/genex.S8
-rw-r--r--arch/mips/kernel/smtc-asm.S9
3 files changed, 15 insertions, 16 deletions
diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index e93e43e1f42d..417c08ac76eb 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -20,10 +20,7 @@
20#include <asm/mipsmtregs.h> 20#include <asm/mipsmtregs.h>
21#endif 21#endif
22 22
23#ifdef CONFIG_PREEMPT 23#ifndef CONFIG_PREEMPT
24 .macro preempt_stop
25 .endm
26#else
27 .macro preempt_stop 24 .macro preempt_stop
28 local_irq_disable 25 local_irq_disable
29 .endm 26 .endm
@@ -32,9 +29,16 @@
32 29
33 .text 30 .text
34 .align 5 31 .align 5
32FEXPORT(ret_from_irq)
33 LONG_S s0, TI_REGS($28)
34#ifdef CONFIG_PREEMPT
35FEXPORT(ret_from_exception)
36#else
37 b _ret_from_irq
35FEXPORT(ret_from_exception) 38FEXPORT(ret_from_exception)
36 preempt_stop 39 preempt_stop
37FEXPORT(ret_from_irq) 40#endif
41FEXPORT(_ret_from_irq)
38 LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 42 LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
39 andi t0, t0, KU_USER 43 andi t0, t0, KU_USER
40 beqz t0, resume_kernel 44 beqz t0, resume_kernel
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index 50ed77297728..5baca16993d0 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -133,9 +133,8 @@ NESTED(handle_int, PT_SIZE, sp)
133 133
134 LONG_L s0, TI_REGS($28) 134 LONG_L s0, TI_REGS($28)
135 LONG_S sp, TI_REGS($28) 135 LONG_S sp, TI_REGS($28)
136 jal plat_irq_dispatch 136 PTR_LA ra, ret_from_irq
137 LONG_S s0, TI_REGS($28) 137 j plat_irq_dispatch
138 j ret_from_irq
139 END(handle_int) 138 END(handle_int)
140 139
141 __INIT 140 __INIT
@@ -224,9 +223,8 @@ NESTED(except_vec_vi_handler, 0, sp)
224 223
225 LONG_L s0, TI_REGS($28) 224 LONG_L s0, TI_REGS($28)
226 LONG_S sp, TI_REGS($28) 225 LONG_S sp, TI_REGS($28)
227 jalr v0
228 LONG_S s0, TI_REGS($28)
229 PTR_LA ra, ret_from_irq 226 PTR_LA ra, ret_from_irq
227 jr v0
230 END(except_vec_vi_handler) 228 END(except_vec_vi_handler)
231 229
232/* 230/*
diff --git a/arch/mips/kernel/smtc-asm.S b/arch/mips/kernel/smtc-asm.S
index 76cb31d57482..1cb9441f1474 100644
--- a/arch/mips/kernel/smtc-asm.S
+++ b/arch/mips/kernel/smtc-asm.S
@@ -97,15 +97,12 @@ FEXPORT(__smtc_ipi_vector)
97 SAVE_ALL 97 SAVE_ALL
98 CLI 98 CLI
99 TRACE_IRQS_OFF 99 TRACE_IRQS_OFF
100 move a0,sp
101 /* Function to be invoked passed stack pad slot 5 */ 100 /* Function to be invoked passed stack pad slot 5 */
102 lw t0,PT_PADSLOT5(sp) 101 lw t0,PT_PADSLOT5(sp)
103 /* Argument from sender passed in stack pad slot 4 */ 102 /* Argument from sender passed in stack pad slot 4 */
104 lw a1,PT_PADSLOT4(sp) 103 lw a0,PT_PADSLOT4(sp)
105 jalr t0 104 PTR_LA ra, _ret_from_irq
106 nop 105 jr t0
107 j ret_from_irq
108 nop
109 106
110/* 107/*
111 * Called from idle loop to provoke processing of queued IPIs 108 * Called from idle loop to provoke processing of queued IPIs