From b86040a59feb255a8193173caa4d5199464433d5 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@arm.com>
Date: Fri, 24 Jul 2009 12:32:54 +0100
Subject: Thumb-2: Implementation of the unified start-up and exceptions code
This patch implements the ARM/Thumb-2 unified kernel start-up and
exception handling code.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
arch/arm/include/asm/assembler.h | 11 +++
arch/arm/include/asm/futex.h | 1 +
arch/arm/kernel/entry-armv.S | 165 +++++++++++++++++++++++----------------
arch/arm/kernel/entry-common.S | 28 ++-----
arch/arm/kernel/entry-header.S | 92 ++++++++++++++++++++--
arch/arm/kernel/head-common.S | 13 +--
arch/arm/kernel/head-nommu.S | 11 ++-
arch/arm/kernel/head.S | 28 ++++---
arch/arm/kernel/process.c | 2 +-
arch/arm/kernel/setup.c | 28 +++++--
arch/arm/kernel/unwind.c | 4 +
11 files changed, 263 insertions(+), 120 deletions(-)
(limited to 'arch')
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 15f8a092b70..1acd1da36d0 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -127,3 +127,14 @@
#endif
#endif
.endm
+
+#ifdef CONFIG_THUMB2_KERNEL
+ .macro setmode, mode, reg
+ mov \reg, #\mode
+ msr cpsr_c, \reg
+ .endm
+#else
+ .macro setmode, mode, reg
+ msr cpsr_c, #\mode
+ .endm
+#endif
diff --git a/arch/arm/include/asm/futex.h b/arch/arm/include/asm/futex.h
index 9ee743b95de..bfcc15929a7 100644
--- a/arch/arm/include/asm/futex.h
+++ b/arch/arm/include/asm/futex.h
@@ -99,6 +99,7 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
__asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
"1: ldrt %0, [%3]\n"
" teq %0, %1\n"
+ " it eq @ explicit IT needed for the 2b label\n"
"2: streqt %2, [%3]\n"
"3:\n"
" .section __ex_table,\"a\"\n"
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 0befd1cabf4..468425f937d 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -34,7 +34,7 @@
@
@ routine called with r0 = irq number, r1 = struct pt_regs *
@
- adrne lr, 1b
+ adrne lr, BSYM(1b)
bne asm_do_IRQ
#ifdef CONFIG_SMP
@@ -46,13 +46,13 @@
*/
test_for_ipi r0, r6, r5, lr
movne r0, sp
- adrne lr, 1b
+ adrne lr, BSYM(1b)
bne do_IPI
#ifdef CONFIG_LOCAL_TIMERS
test_for_ltirq r0, r6, r5, lr
movne r0, sp
- adrne lr, 1b
+ adrne lr, BSYM(1b)
bne do_local_timer
#endif
#endif
@@ -70,7 +70,10 @@
*/
.macro inv_entry, reason
sub sp, sp, #S_FRAME_SIZE
- stmib sp, {r1 - lr}
+ ARM( stmib sp, {r1 - lr} )
+ THUMB( stmia sp, {r0 - r12} )
+ THUMB( str sp, [sp, #S_SP] )
+ THUMB( str lr, [sp, #S_LR] )
mov r1, #\reason
.endm
@@ -126,17 +129,24 @@ ENDPROC(__und_invalid)
.macro svc_entry, stack_hole=0
UNWIND(.fnstart )
UNWIND(.save {r0 - pc} )
- sub sp, sp, #(S_FRAME_SIZE + \stack_hole)
+ sub sp, sp, #(S_FRAME_SIZE + \stack_hole - 4)
+#ifdef CONFIG_THUMB2_KERNEL
+ SPFIX( str r0, [sp] ) @ temporarily saved
+ SPFIX( mov r0, sp )
+ SPFIX( tst r0, #4 ) @ test original stack alignment
+ SPFIX( ldr r0, [sp] ) @ restored
+#else
SPFIX( tst sp, #4 )
- SPFIX( bicne sp, sp, #4 )
- stmib sp, {r1 - r12}
+#endif
+ SPFIX( subeq sp, sp, #4 )
+ stmia sp, {r1 - r12}
ldmia r0, {r1 - r3}
- add r5, sp, #S_SP @ here for interlock avoidance
+ add r5, sp, #S_SP - 4 @ here for interlock avoidance
mov r4, #-1 @ "" "" "" ""
- add r0, sp, #(S_FRAME_SIZE + \stack_hole)
- SPFIX( addne r0, r0, #4 )
- str r1, [sp] @ save the "real" r0 copied
+ add r0, sp, #(S_FRAME_SIZE + \stack_hole - 4)
+ SPFIX( addeq r0, r0, #4 )
+ str r1, [sp, #-4]! @ save the "real" r0 copied
@ from the exception stack
mov r1, lr
@@ -196,9 +206,8 @@ __dabt_svc:
@
@ restore SPSR and restart the instruction
@
- ldr r0, [sp, #S_PSR]
- msr spsr_cxsf, r0
- ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr
+ ldr r2, [sp, #S_PSR]
+ svc_exit r2 @ return from exception
UNWIND(.fnend )
ENDPROC(__dabt_svc)
@@ -225,13 +234,12 @@ __irq_svc:
tst r0, #_TIF_NEED_RESCHED
blne svc_preempt
#endif
- ldr r0, [sp, #S_PSR] @ irqs are already disabled
- msr spsr_cxsf, r0
+ ldr r4, [sp, #S_PSR] @ irqs are already disabled
#ifdef CONFIG_TRACE_IRQFLAGS
- tst r0, #PSR_I_BIT
+ tst r4, #PSR_I_BIT
bleq trace_hardirqs_on
#endif
- ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr
+ svc_exit r4 @ return from exception
UNWIND(.fnend )
ENDPROC(__irq_svc)
@@ -266,7 +274,7 @@ __und_svc:
@ r0 - instruction
@
ldr r0, [r2, #-4]
- adr r9, 1f
+ adr r9, BSYM(1f)
bl call_fpe
mov r0, sp @ struct pt_regs *regs
@@ -280,9 +288,8 @@ __und_svc:
@
@ restore SPSR and restart the instruction
@
- ldr lr, [sp, #S_PSR] @ Get SVC cpsr
- msr spsr_cxsf, lr
- ldmia sp, {r0 - pc}^ @ Restore SVC registers
+ ldr r2, [sp, #S_PSR] @ Get SVC cpsr
+ svc_exit r2 @ return from exception
UNWIND(.fnend )
ENDPROC(__und_svc)
@@ -323,9 +330,8 @@ __pabt_svc:
@
@ restore SPSR and restart the instruction
@
- ldr r0, [sp, #S_PSR]
- msr spsr_cxsf, r0
- ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr
+ ldr r2, [sp, #S_PSR]
+ svc_exit r2 @ return from exception
UNWIND(.fnend )
ENDPROC(__pabt_svc)
@@ -353,7 +359,8 @@ ENDPROC(__pabt_svc)
UNWIND(.fnstart )
UNWIND(.cantunwind ) @ don't unwind the user space
sub sp, sp, #S_FRAME_SIZE
- stmib sp, {r1 - r12}
+ ARM( stmib sp, {r1 - r12} )
+ THUMB( stmia sp, {r0 - r12} )
ldmia r0, {r1 - r3}
add r0, sp, #S_PC @ here for interlock avoidance
@@ -372,7 +379,8 @@ ENDPROC(__pabt_svc)
@ Also, separately save sp_usr and lr_usr
@
stmia r0, {r2 - r4}
- stmdb r0, {sp, lr}^
+ ARM( stmdb r0, {sp, lr}^ )
+ THUMB( store_user_sp_lr r0, r1, S_SP - S_PC )
@
@ Enable the alignment trap while in kernel mode
@@ -427,7 +435,7 @@ __dabt_usr:
@
enable_irq
mov r2, sp
- adr lr, ret_from_exception
+ adr lr, BSYM(ret_from_exception)
b do_DataAbort
UNWIND(.fnend )
ENDPROC(__dabt_usr)
@@ -452,7 +460,9 @@ __irq_usr:
ldr r0, [tsk, #TI_PREEMPT]
str r8, [tsk, #TI_PREEMPT]
teq r0, r7
- strne r0, [r0, -r0]
+ ARM( strne r0, [r0, -r0] )
+ THUMB( movne r0, #0 )
+ THUMB( strne r0, [r0] )
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
bl trace_hardirqs_on
@@ -476,9 +486,10 @@ __und_usr:
@
@ r0 - instruction
@
- adr r9, ret_from_exception
- adr lr, __und_usr_unknown
+ adr r9, BSYM(ret_from_exception)
+ adr lr, BSYM(__und_usr_unknown)
tst r3, #PSR_T_BIT @ Thumb mode?
+ itet eq @ explicit IT needed for the 1f label
subeq r4, r2, #4 @ ARM instr at LR - 4
subne r4, r2, #2 @ Thumb instr at LR - 2
1: ldreqt r0, [r4]
@@ -488,7 +499,10 @@ __und_usr:
beq call_fpe
@ Thumb instruction
#if __LINUX_ARM_ARCH__ >= 7
-2: ldrht r5, [r4], #2
+2:
+ ARM( ldrht r5, [r4], #2 )
+ THUMB( ldrht r5, [r4] )
+ THUMB( add r4, r4, #2 )
and r0, r5, #0xf800 @ mask bits 111x x... .... ....
cmp r0, #0xe800 @ 32bit instruction if xx != 0
blo __und_usr_unknown
@@ -577,9 +591,11 @@ call_fpe:
moveq pc, lr
get_thread_info r10 @ get current thread
and r8, r0, #0x00000f00 @ mask out CP number
+ THUMB( lsr r8, r8, #8 )
mov r7, #1
add r6, r10, #TI_USED_CP
- strb r7, [r6, r8, lsr #8] @ set appropriate used_cp[]
+ ARM( strb r7, [r6, r8, lsr #8] ) @ set appropriate used_cp[]
+ THUMB( strb r7, [r6, r8] ) @ set appropriate used_cp[]
#ifdef CONFIG_IWMMXT
@ Test if we need to give access to iWMMXt coprocessors
ldr r5, [r10, #TI_FLAGS]
@@ -587,36 +603,38 @@ call_fpe:
movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1)
bcs iwmmxt_task_enable
#endif
- add pc, pc, r8, lsr #6
- mov r0, r0
-
- mov pc, lr @ CP#0
- b do_fpe @ CP#1 (FPE)
- b do_fpe @ CP#2 (FPE)
- mov pc, lr @ CP#3
+ ARM( add pc, pc, r8, lsr #6 )
+ THUMB( lsl r8, r8, #2 )
+ THUMB( add pc, r8 )
+ nop
+
+ W(mov) pc, lr @ CP#0
+ W(b) do_fpe @ CP#1 (FPE)
+ W(b) do_fpe @ CP#2 (FPE)
+ W(mov) pc, lr @ CP#3
#ifdef CONFIG_CRUNCH
b crunch_task_enable @ CP#4 (MaverickCrunch)
b crunch_task_enable @ CP#5 (MaverickCrunch)
b crunch_task_enable @ CP#6 (MaverickCrunch)
#else
- mov pc, lr @ CP#4
- mov pc, lr @ CP#5
- mov pc, lr @ CP#6
+ W(mov) pc, lr @ CP#4
+ W(mov) pc, lr @ CP#5
+ W(mov) pc, lr @ CP#6
#endif
- mov pc, lr @ CP#7
- mov pc, lr @ CP#8
- mov pc, lr @ CP#9
+ W(mov) pc, lr @ CP#7
+ W(mov) pc, lr @ CP#8
+ W(mov) pc, lr @ CP#9
#ifdef CONFIG_VFP
- b do_vfp @ CP#10 (VFP)
- b do_vfp @ CP#11 (VFP)
+ W(b) do_vfp @ CP#10 (VFP)
+ W(b) do_vfp @ CP#11 (VFP)
#else
- mov pc, lr @ CP#10 (VFP)
- mov pc, lr @ CP#11 (VFP)
+ W(mov) pc, lr @ CP#10 (VFP)
+ W(mov) pc, lr @ CP#11 (VFP)
#endif
- mov pc, lr @ CP#12
- mov pc, lr @ CP#13
- mov pc, lr @ CP#14 (Debug)
- mov pc, lr @ CP#15 (Control)
+ W(mov) pc, lr @ CP#12
+ W(mov) pc, lr @ CP#13
+ W(mov) pc, lr @ CP#14 (Debug)
+ W(mov) pc, lr @ CP#15 (Control)
#ifdef CONFIG_NEON
.align 6
@@ -667,7 +685,7 @@ no_fp: mov pc, lr
__und_usr_unknown:
enable_irq
mov r0, sp
- adr lr, ret_from_exception
+ adr lr, BSYM(ret_from_exception)
b do_undefinstr
ENDPROC(__und_usr_unknown)
@@ -711,7 +729,10 @@ ENTRY(__switch_to)
UNWIND(.cantunwind )
add ip, r1, #TI_CPU_SAVE
ldr r3, [r2, #TI_TP_VALUE]
- stmia ip!, {r4 - sl, fp, sp, lr} @ Store most regs on stack
+ ARM( stmia ip!, {r4 - sl, fp, sp, lr} ) @ Store most regs on stack
+ THUMB( stmia ip!, {r4 - sl, fp} ) @ Store most regs on stack
+ THUMB( str sp, [ip], #4 )
+ THUMB( str lr, [ip], #4 )
#ifdef CONFIG_MMU
ldr r6, [r2, #TI_CPU_DOMAIN]
#endif
@@ -736,8 +757,12 @@ ENTRY(__switch_to)
ldr r0, =thread_notify_head
mov r1, #THREAD_NOTIFY_SWITCH
bl atomic_notifier_call_chain
+ THUMB( mov ip, r4 )
mov r0, r5
- ldmia r4, {r4 - sl, fp, sp, pc} @ Load all regs saved previously
+ ARM( ldmia r4, {r4 - sl, fp, sp, pc} ) @ Load all regs saved previously
+ THUMB( ldmia ip!, {r4 - sl, fp} ) @ Load all regs saved previously
+ THUMB( ldr sp, [ip], #4 )
+ THUMB( ldr pc, [ip] )
UNWIND(.fnend )
ENDPROC(__switch_to)
@@ -772,6 +797,7 @@ ENDPROC(__switch_to)
* if your compiled code is not going to use the new instructions for other
* purpose.
*/
+ THUMB( .arm )
.macro usr_ret, reg
#ifdef CONFIG_ARM_THUMB
@@ -1020,6 +1046,7 @@ __kuser_helper_version: @ 0xffff0ffc
.globl __kuser_helper_end
__kuser_helper_end:
+ THUMB( .thumb )
/*
* Vector stubs.
@@ -1054,15 +1081,17 @@ vector_\name:
@ Prepare for SVC32 mode. IRQs remain disabled.
@
mrs r0, cpsr
- eor r0, r0, #(\mode ^ SVC_MODE)
+ eor r0, r0, #(\mode ^ SVC_MODE | PSR_ISETSTATE)
msr spsr_cxsf, r0
@
@ the branch table must immediately follow this code
@
and lr, lr, #0x0f
+ THUMB( adr r0, 1f )
+ THUMB( ldr lr, [r0, lr, lsl #2] )
mov r0, sp
- ldr lr, [pc, lr, lsl #2]
+ ARM( ldr lr, [pc, lr, lsl #2] )
movs pc, lr @ branch to handler in SVC mode
ENDPROC(vector_\name)
@@ -1206,14 +1235,16 @@ __stubs_end:
.globl __vectors_start
__vectors_start:
- swi SYS_ERROR0
- b vector_und + stubs_offset
- ldr pc, .LCvswi + stubs_offset
- b vector_pabt + stubs_offset
- b vector_dabt + stubs_offset
- b vector_addrexcptn + stubs_offset
- b vector_irq + stubs_offset
- b vector_fiq + stubs_offset
+ ARM( swi SYS_ERROR0 )
+ THUMB( svc #0 )
+ THUMB( nop )
+ W(b) vector_und + stubs_offset
+ W(ldr) pc, .LCvswi + stubs_offset
+ W(b) vector_pabt + stubs_offset
+ W(b) vector_dabt + stubs_offset
+ W(b) vector_addrexcptn + stubs_offset
+ W(b) vector_irq + stubs_offset
+ W(b) vector_fiq + stubs_offset
.globl __vectors_end
__vectors_end:
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 366e5097a41..a0540c9f1f0 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -33,14 +33,7 @@ ret_fast_syscall:
/* perform architecture specific actions before user return */
arch_ret_to_user r1, lr
- @ fast_restore_user_regs
- ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr
- ldr lr, [sp, #S_OFF + S_PC]! @ get pc
- msr spsr_cxsf, r1 @ save in spsr_svc
- ldmdb sp, {r1 - lr}^ @ get calling r1 - lr
- mov r0, r0
- add sp, sp, #S_FRAME_SIZE - S_PC
- movs pc, lr @ return & move spsr_svc into cpsr
+ restore_user_regs fast = 1, offset = S_OFF
UNWIND(.fnend )
/*
@@ -73,14 +66,7 @@ no_work_pending:
/* perform architecture specific actions before user return */
arch_ret_to_user r1, lr
- @ slow_restore_user_regs
- ldr r1, [sp, #S_PSR] @ get calling cpsr
- ldr lr, [sp, #S_PC]! @ get pc
- msr spsr_cxsf, r1 @ save in spsr_svc
- ldmdb sp, {r0 - lr}^ @ get calling r0 - lr
- mov r0, r0
- add sp, sp, #S_FRAME_SIZE - S_PC
- movs pc, lr @ return & move spsr_svc into cpsr
+ restore_user_regs fast = 0, offset = 0
ENDPROC(ret_to_user)
/*
@@ -182,8 +168,10 @@ ftrace_stub:
ENTRY(vector_swi)
sub sp, sp, #S_FRAME_SIZE
stmia sp, {r0 - r12} @ Calling r0 - r12
- add r8, sp, #S_PC
- stmdb r8, {sp, lr}^ @ Calling sp, lr
+ ARM( add r8, sp, #S_PC )
+ ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr
+ THUMB( mov r8, sp )
+ THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr
mrs r8, spsr @ called from non-FIQ mode, so ok.
str lr, [sp, #S_PC] @ Save calling PC
str r8, [sp, #S_PSR] @ Save CPSR
@@ -272,7 +260,7 @@ ENTRY(vector_swi)
bne __sys_trace
cmp scno, #NR_syscalls @ check upper syscall limit
- adr lr, ret_fast_syscall @ return address
+ adr lr, BSYM(ret_fast_syscall) @ return address
ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
add r1, sp, #S_OFF
@@ -293,7 +281,7 @@ __sys_trace:
mov r0, #0 @ trace entry [IP = 0]
bl syscall_trace
- adr lr, __sys_trace_return @ return address
+ adr lr, BSYM(__sys_trace_return) @ return address
mov scno, r0 @ syscall number (possibly new)
add r1, sp, #S_R0 + S_OFF @ pointer to regs
cmp scno, #NR_syscalls @ check upper syscall limit
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 87ab4e15799..a4eaf4f920c 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -36,11 +36,6 @@
#endif
.endm
- .macro get_thread_info, rd
- mov \rd, sp, lsr #13
- mov \rd, \rd, lsl #13
- .endm
-
.macro alignment_trap, rtemp
#ifdef CONFIG_ALIGNMENT_TRAP
ldr \rtemp, .LCcralign
@@ -49,6 +44,93 @@
#endif
.endm
+ @
+ @ Store/load the USER SP and LR registers by switching to the SYS
+ @ mode. Useful in Thumb-2 mode where "stm/ldm rd, {sp, lr}^" is not
+ @ available. Should only be called from SVC mode
+ @
+ .macro store_user_sp_lr, rd, rtemp, offset = 0
+ mrs \rtemp, cpsr
+ eor \rtemp, \rtemp, #(SVC_MODE ^ SYSTEM_MODE)
+ msr cpsr_c, \rtemp @ switch to the SYS mode
+
+ str sp, [\rd, #\offset] @ save sp_usr
+ str lr, [\rd, #\offset + 4] @ save lr_usr
+
+ eor \rtemp, \rtemp, #(SVC_MODE ^ SYSTEM_MODE)
+ msr cpsr_c, \rtemp @ switch back to the SVC mode
+ .endm
+
+ .macro load_user_sp_lr, rd, rtemp, offset = 0
+ mrs \rtemp, cpsr
+ eor \rtemp, \rtemp, #(SVC_MODE ^ SYSTEM_MODE)
+ msr cpsr_c, \rtemp @ switch to the SYS mode
+
+ ldr sp, [\rd, #\offset] @ load sp_usr
+ ldr lr, [\rd, #\offset + 4] @ load lr_usr
+
+ eor \rtemp, \rtemp, #(SVC_MODE ^ SYSTEM_MODE)
+ msr cpsr_c, \rtemp @ switch back to the SVC mode
+ .endm
+
+#ifndef CONFIG_THUMB2_KERNEL
+ .macro svc_exit, rpsr
+ msr spsr_cxsf, \rpsr
+ ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr
+ .endm
+
+ .macro restore_user_regs, fast = 0, offset = 0
+ ldr r1, [sp, #\offset + S_PSR] @ get calling cpsr
+ ldr lr, [sp, #\offset + S_PC]! @ get pc
+ msr spsr_cxsf, r1 @ save in spsr_svc
+ .if \fast
+ ldmdb sp, {r1 - lr}^ @ get calling r1 - lr
+ .else
+ ldmdb sp, {r0 - lr}^ @ get calling r0 - lr
+ .endif
+ add sp, sp, #S_FRAME_SIZE - S_PC
+ movs pc, lr @ return & move spsr_svc into cpsr
+ .endm
+
+ .macro get_thread_info, rd
+ mov \rd, sp, lsr #13
+ mov \rd, \rd, lsl #13
+ .endm
+#else /* CONFIG_THUMB2_KERNEL */
+ .macro svc_exit, rpsr
+ ldr r0, [sp, #S_SP] @ top of the stack
+ ldr r1, [sp, #S_PC] @ return address
+ tst r0, #4 @ orig stack 8-byte aligned?
+ stmdb r0, {r1, \rpsr} @ rfe context
+ ldmia sp, {r0 - r12}
+ ldr lr, [sp, #S_LR]
+ addeq sp, sp, #S_FRAME_SIZE - 8 @ aligned
+ addne sp, sp, #S_FRAME_SIZE - 4 @ not aligned
+ rfeia sp!
+ .endm
+
+ .macro restore_user_regs, fast = 0, offset = 0
+ mov r2, sp
+ load_user_sp_lr r2, r3, \offset + S_SP @ calling sp, lr
+ ldr r1, [sp, #\offset + S_PSR] @ get calling cpsr
+ ldr lr, [sp, #\offset + S_PC] @ get pc
+ add sp, sp, #\offset + S_SP
+ msr spsr_cxsf, r1 @ save in spsr_svc
+ .if \fast
+ ldmdb sp, {r1 - r12} @ get calling r1 - r12
+ .else
+ ldmdb sp, {r0 - r12} @ get calling r0 - r12
+ .endif
+ add sp, sp, #S_FRAME_SIZE - S_SP
+ movs pc, lr @ return & move spsr_svc into cpsr
+ .endm
+
+ .macro get_thread_info, rd
+ mov \rd, sp
+ lsr \rd, \rd, #13
+ mov \rd, \rd, lsl #13
+ .endm
+#endif /* !CONFIG_THUMB2_KERNEL */
/*
* These are the registers used in the syscall handler, and allow us to
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index dbfaef07a1f..93ad576b2d7 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -52,7 +52,9 @@ __mmap_switched:
strcc fp, [r6],#4
bcc 1b
- ldmia r3, {r4, r5, r6, r7, sp}
+ ARM( ldmia r3, {r4, r5, r6, r7, sp})
+ THUMB( ldmia r3, {r4, r5, r6, r7} )
+ THUMB( ldr sp, [r3, #16] )
str r9, [r4] @ Save processor ID
str r1, [r5] @ Save machine type
str r2, [r6] @ Save atags pointer
@@ -156,7 +158,8 @@ ENDPROC(__error)
*/
__lookup_processor_type:
adr r3, 3f
- ldmda r3, {r5 - r7}
+ ldmia r3, {r5 - r7}
+ add r3, r3, #8
sub r3, r3, r7 @ get offset between virt&phys
add r5, r5, r3 @ convert virt addresses to
add r6, r6, r3 @ physical address space
@@ -187,9 +190,9 @@ ENDPROC(lookup_processor_type)
* more information about the __proc_info and __arch_info structures.
*/
.align 2
- .long __proc_info_begin
+3: .long __proc_info_begin
.long __proc_info_end
-3: .long .
+4: .long .
.long __arch_info_begin
.long __arch_info_end
@@ -205,7 +208,7 @@ ENDPROC(lookup_processor_type)
* r5 = mach_info pointer in physical address space
*/
__lookup_machine_type:
- adr r3, 3b
+ adr r3, 4b
ldmia r3, {r4, r5, r6}
sub r3, r3, r4 @ get offset between virt&phys
add r5, r5, r3 @ convert virt addresses to
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index cc87e1765ed..b16393d2b71 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -34,7 +34,7 @@
*/
.section ".text.head", "ax"
ENTRY(stext)
- msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE @ ensure svc mode
+ setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode
@ and irqs disabled
#ifndef CONFIG_CPU_CP15
ldr r9, =CONFIG_PROCESSOR_ID
@@ -50,8 +50,10 @@ ENTRY(stext)
ldr r13, __switch_data @ address to jump to after
@ the initialization is done
- adr lr, __after_proc_init @ return (PIC) address
- add pc, r10, #PROCINFO_INITFUNC
+ adr lr, BSYM(__after_proc_init) @ return (PIC) address
+ ARM( add pc, r10, #PROCINFO_INITFUNC )
+ THUMB( add r12, r10, #PROCINFO_INITFUNC )
+ THUMB( mov pc, r12 )
ENDPROC(stext)
/*
@@ -82,7 +84,8 @@ __after_proc_init:
mcr p15, 0, r0, c1, c0, 0 @ write control reg
#endif /* CONFIG_CPU_CP15 */
- mov pc, r13 @ clear the BSS and jump
+ mov r3, r13
+ mov pc, r3 @ clear the BSS and jump
@ to start_kernel
ENDPROC(__after_proc_init)
.ltorg
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 21e17dc94cb..38ccbe1d3b2 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -76,7 +76,7 @@
*/
.section ".text.head", "ax"
ENTRY(stext)
- msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE @ ensure svc mode
+ setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode
@ and irqs disabled
mrc p15, 0, r9, c0, c0 @ get processor id
bl __lookup_processor_type @ r5=procinfo r9=cpuid
@@ -97,8 +97,10 @@ ENTRY(stext)
*/
ldr r13, __switch_data @ address to jump to after
@ mmu has been enabled
- adr lr, __enable_mmu @ return (PIC) address
- add pc, r10, #PROCINFO_INITFUNC
+ adr lr, BSYM(__enable_mmu) @ return (PIC) address
+ ARM( add pc, r10, #PROCINFO_INITFUNC )
+ THUMB( add r12, r10, #PROCINFO_INITFUNC )
+ THUMB( mov pc, r12 )
ENDPROC(stext)
#if defined(CONFIG_SMP)
@@ -110,7 +112,7 @@ ENTRY(secondary_startup)
* the processor type - there is no need to check the machine type
* as it has already been validated by the primary processor.
*/
- msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
+ setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9
mrc p15, 0, r9, c0, c0 @ get processor id
bl __lookup_processor_type
movs r10, r5 @ invalid processor?
@@ -121,12 +123,15 @@ ENTRY(secondary_startup)
* Use the page tables supplied from __cpu_up.
*/
adr r4, __secondary_data
- ldmia r4, {r5, r7, r13} @ address to jump to after
+ ldmia r4, {r5, r7, r12} @ address to jump to after
sub r4, r4, r5 @ mmu has been enabled
ldr r4, [r7, r4] @ get secondary_data.pgdir
- adr lr, __enable_mmu @ return address
- add pc, r10, #PROCINFO_INITFUNC @ initialise processor
- @ (return control reg)
+ adr lr, BSYM(__enable_mmu) @ return address
+ mov r13, r12 @ __secondary_switched address
+ ARM( add pc, r10, #PROCINFO_INITFUNC ) @ initialise processor
+ @ (return control reg)
+ THUMB( add r12, r10, #PROCINFO_INITFUNC )
+ THUMB( mov pc, r12 )
ENDPROC(secondary_startup)
/*
@@ -193,8 +198,8 @@ __turn_mmu_on:
mcr p15, 0, r0, c1, c0, 0 @ write control reg
mrc p15, 0, r3, c0, c0, 0 @ read id reg
mov r3, r3
- mov r3, r3
- mov pc, r13
+ mov r3, r13
+ mov pc, r3
ENDPROC(__turn_mmu_on)
@@ -235,7 +240,8 @@ __create_page_tables:
* will be removed by paging_init(). We use our current program
* counter to determine corresponding section base address.
*/
- mov r6, pc, lsr #20 @ start of kernel section
+ mov r6, pc
+ mov r6, r6, lsr #20 @ start of kernel section
orr r3, r7, r6, lsl #20 @ flags + kernel base
str r3, [r4, r6, lsl #2] @ identity mapping
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 39196dff478..790fbee92ec 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -388,7 +388,7 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
regs.ARM_r2 = (unsigned long)fn;
regs.ARM_r3 = (unsigned long)kernel_thread_exit;
regs.ARM_pc = (unsigned long)kernel_thread_helper;
- regs.ARM_cpsr = SVC_MODE | PSR_ENDSTATE;
+ regs.ARM_cpsr = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE;
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
}
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index bc5e4128f9f..d4d4f77c91b 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -25,6 +25,7 @@
#include <linux/smp.h>
#include <linux/fs.h>
+#include <asm/unified.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/elf.h>
@@ -326,26 +327,39 @@ void cpu_init(void)
BUG();
}
+ /*
+ * Define the placement constraint for the inline asm directive below.
+ * In Thumb-2, msr with an immediate value is not allowed.
+ */
+#ifdef CONFIG_THUMB2_KERNEL
+#define PLC "r"
+#else
+#define PLC "I"
+#endif
+
/*
* setup stacks for re-entrant exception handlers
*/
__asm__ (
"msr cpsr_c, %1\n\t"
- "add sp, %0, %2\n\t"
+ "add r14, %0, %2\n\t"
+ "mov sp, r14\n\t"
"msr cpsr_c, %3\n\t"
- "add sp, %0, %4\n\t"
+ "add r14, %0, %4\n\t"
+ "mov sp, r14\n\t"
"msr cpsr_c, %5\n\t"
- "add sp, %0, %6\n\t"
+ "add r14, %0, %6\n\t"
+ "mov sp, r14\n\t"
"msr cpsr_c, %7"
:
: "r" (stk),
- "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
+ PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
"I" (offsetof(struct stack, irq[0])),
- "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
+ PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
"I" (offsetof(struct stack, abt[0])),
- "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
+ PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
"I" (offsetof(struct stack, und[0])),
- "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
+ PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
: "r14");
}
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index dd56e11f339..39baf1128bf 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -62,7 +62,11 @@ struct unwind_ctrl_block {
};
enum regs {
+#ifdef CONFIG_THUMB2_KERNEL
+ FP = 7,
+#else
FP = 11,
+#endif
SP = 13,
LR = 14,
PC = 15
--
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