aboutsummaryrefslogtreecommitdiff
path: root/arch/arm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/Makefile5
-rw-r--r--arch/arm/kernel/asm-offsets.c20
-rw-r--r--arch/arm/kernel/entry-armv.S67
-rw-r--r--arch/arm/kernel/entry-common.S65
-rw-r--r--arch/arm/kernel/entry-header.S143
-rw-r--r--arch/arm/kernel/traps.c11
6 files changed, 124 insertions, 187 deletions
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 07a56ff6149..4a2af55e134 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -31,8 +31,3 @@ head-y := head.o
obj-$(CONFIG_DEBUG_LL) += debug.o
extra-y := $(head-y) init_task.o vmlinux.lds
-
-# Spell out some dependencies that aren't automatically figured out
-$(obj)/entry-armv.o: $(obj)/entry-header.S include/asm-arm/constants.h
-$(obj)/entry-common.o: $(obj)/entry-header.S include/asm-arm/constants.h \
- $(obj)/calls.S
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 99d43259ff8..c1ff4d1f1bf 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -64,6 +64,26 @@ int main(void)
DEFINE(TI_VFPSTATE, offsetof(struct thread_info, vfpstate));
DEFINE(TI_IWMMXT_STATE, (offsetof(struct thread_info, fpstate)+4)&~7);
BLANK();
+ DEFINE(S_R0, offsetof(struct pt_regs, ARM_r0));
+ DEFINE(S_R1, offsetof(struct pt_regs, ARM_r1));
+ DEFINE(S_R2, offsetof(struct pt_regs, ARM_r2));
+ DEFINE(S_R3, offsetof(struct pt_regs, ARM_r3));
+ DEFINE(S_R4, offsetof(struct pt_regs, ARM_r4));
+ DEFINE(S_R5, offsetof(struct pt_regs, ARM_r5));
+ DEFINE(S_R6, offsetof(struct pt_regs, ARM_r6));
+ DEFINE(S_R7, offsetof(struct pt_regs, ARM_r7));
+ DEFINE(S_R8, offsetof(struct pt_regs, ARM_r8));
+ DEFINE(S_R9, offsetof(struct pt_regs, ARM_r9));
+ DEFINE(S_R10, offsetof(struct pt_regs, ARM_r10));
+ DEFINE(S_FP, offsetof(struct pt_regs, ARM_fp));
+ DEFINE(S_IP, offsetof(struct pt_regs, ARM_ip));
+ DEFINE(S_SP, offsetof(struct pt_regs, ARM_sp));
+ DEFINE(S_LR, offsetof(struct pt_regs, ARM_lr));
+ DEFINE(S_PC, offsetof(struct pt_regs, ARM_pc));
+ DEFINE(S_PSR, offsetof(struct pt_regs, ARM_cpsr));
+ DEFINE(S_OLD_R0, offsetof(struct pt_regs, ARM_ORIG_r0));
+ DEFINE(S_FRAME_SIZE, sizeof(struct pt_regs));
+ BLANK();
#if __LINUX_ARM_ARCH__ >= 6
DEFINE(MM_CONTEXT_ID, offsetof(struct mm_struct, context.id));
BLANK();
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index bb27c317d94..2a5c3fe09a9 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -14,12 +14,12 @@
* it to save wrong values... Be aware!
*/
#include <linux/config.h>
-#include <linux/init.h>
-#include <asm/thread_info.h>
#include <asm/glue.h>
-#include <asm/ptrace.h>
#include <asm/vfpmacros.h>
+#include <asm/hardware.h> @ should be moved into entry-macro.S
+#include <asm/arch/irqs.h> @ should be moved into entry-macro.S
+#include <asm/arch/entry-macro.S>
#include "entry-header.S"
@@ -118,7 +118,7 @@ __dabt_svc:
@
@ IRQs off again before pulling preserved data off the stack
@
- disable_irq r0
+ disable_irq
@
@ restore SPSR and restart the instruction
@@ -198,7 +198,7 @@ __und_svc:
@
@ IRQs off again before pulling preserved data off the stack
@
-1: disable_irq r0
+1: disable_irq
@
@ restore SPSR and restart the instruction
@@ -232,7 +232,7 @@ __pabt_svc:
@
@ IRQs off again before pulling preserved data off the stack
@
- disable_irq r0
+ disable_irq
@
@ restore SPSR and restart the instruction
@@ -316,7 +316,7 @@ __dabt_usr:
@
@ IRQs on, then call the main handler
@
- enable_irq r2
+ enable_irq
mov r2, sp
adr lr, ret_from_exception
b do_DataAbort
@@ -418,7 +418,7 @@ call_fpe:
movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1)
bcs iwmmxt_task_enable
#endif
- enable_irq r7
+ enable_irq
add pc, pc, r8, lsr #6
mov r0, r0
@@ -472,7 +472,7 @@ fpundefinstr:
__pabt_usr:
usr_entry abt
- enable_irq r0 @ Enable interrupts
+ enable_irq @ Enable interrupts
mov r0, r2 @ address (pc)
mov r1, sp @ regs
bl do_PrefetchAbort @ call abort handler
@@ -522,8 +522,9 @@ ENTRY(__switch_to)
/*
* Vector stubs.
*
- * This code is copied to 0x200 or 0xffff0200 so we can use branches in the
- * vectors, rather than ldr's.
+ * This code is copied to 0xffff0200 so we can use branches in the
+ * vectors, rather than ldr's. Note that this code must not
+ * exceed 0x300 bytes.
*
* Common stub entry macro:
* Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
@@ -544,7 +545,7 @@ vector_\name:
@
mrs r13, cpsr
bic r13, r13, #MODE_MASK
- orr r13, r13, #MODE_SVC
+ orr r13, r13, #SVC_MODE
msr spsr_cxsf, r13 @ switch to SVC_32 mode
and lr, lr, #15
@@ -552,6 +553,7 @@ vector_\name:
movs pc, lr @ Changes mode and branches
.endm
+ .globl __stubs_start
__stubs_start:
/*
* Interrupt dispatcher
@@ -686,37 +688,24 @@ vector_addrexcptn:
.LCsabt:
.word __temp_abt
+ .globl __stubs_end
__stubs_end:
- .equ __real_stubs_start, .LCvectors + 0x200
+ .equ stubs_offset, __vectors_start + 0x200 - __stubs_start
-.LCvectors:
+ .globl __vectors_start
+__vectors_start:
swi SYS_ERROR0
- b __real_stubs_start + (vector_und - __stubs_start)
- ldr pc, __real_stubs_start + (.LCvswi - __stubs_start)
- b __real_stubs_start + (vector_pabt - __stubs_start)
- b __real_stubs_start + (vector_dabt - __stubs_start)
- b __real_stubs_start + (vector_addrexcptn - __stubs_start)
- b __real_stubs_start + (vector_irq - __stubs_start)
- b __real_stubs_start + (vector_fiq - __stubs_start)
-
-ENTRY(__trap_init)
- stmfd sp!, {r4 - r6, lr}
-
- mov r0, #0xff000000
- orr r0, r0, #0x00ff0000 @ high vectors position
- adr r1, .LCvectors @ set up the vectors
- ldmia r1, {r1, r2, r3, r4, r5, r6, ip, lr}
- stmia r0, {r1, r2, r3, r4, r5, r6, ip, lr}
-
- add r2, r0, #0x200
- adr r0, __stubs_start @ copy stubs to 0x200
- adr r1, __stubs_end
-1: ldr r3, [r0], #4
- str r3, [r2], #4
- cmp r0, r1
- blt 1b
- LOADREGS(fd, sp!, {r4 - r6, pc})
+ 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
+
+ .globl __vectors_end
+__vectors_end:
.data
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 53a7e0dea44..3f8d0e3aefa 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -9,19 +9,10 @@
*/
#include <linux/config.h>
-#include <asm/thread_info.h>
-#include <asm/ptrace.h>
#include <asm/unistd.h>
#include "entry-header.S"
-/*
- * We rely on the fact that R0 is at the bottom of the stack (due to
- * slow/fast restore user regs).
- */
-#if S_R0 != 0
-#error "Please fix"
-#endif
.align 5
/*
@@ -30,11 +21,19 @@
* stack.
*/
ret_fast_syscall:
- disable_irq r1 @ disable interrupts
+ disable_irq @ disable interrupts
ldr r1, [tsk, #TI_FLAGS]
tst r1, #_TIF_WORK_MASK
bne fast_work_pending
- fast_restore_user_regs
+
+ @ 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
/*
* Ok, we need to do extra processing, enter the slow path.
@@ -49,7 +48,7 @@ work_pending:
mov r0, sp @ 'regs'
mov r2, why @ 'syscall'
bl do_notify_resume
- disable_irq r1 @ disable interrupts
+ disable_irq @ disable interrupts
b no_work_pending
work_resched:
@@ -59,12 +58,19 @@ work_resched:
*/
ENTRY(ret_to_user)
ret_slow_syscall:
- disable_irq r1 @ disable interrupts
+ disable_irq @ disable interrupts
ldr r1, [tsk, #TI_FLAGS]
tst r1, #_TIF_WORK_MASK
bne work_pending
no_work_pending:
- slow_restore_user_regs
+ @ 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 r1 - lr
+ mov r0, r0
+ add sp, sp, #S_FRAME_SIZE - S_PC
+ movs pc, lr @ return & move spsr_svc into cpsr
/*
* This is how we return from a fork.
@@ -116,9 +122,26 @@ ENTRY(ret_from_fork)
.align 5
ENTRY(vector_swi)
- save_user_regs
+ 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
+ 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
+ str r0, [sp, #S_OLD_R0] @ Save OLD_R0
zero_fp
- get_scno
+
+ /*
+ * Get the system call number.
+ */
+#ifdef CONFIG_ARM_THUMB
+ tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
+ addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in
+ ldreq scno, [lr, #-4]
+#else
+ ldr scno, [lr, #-4] @ get SWI instruction
+#endif
arm710_bug_check scno, ip
#ifdef CONFIG_ALIGNMENT_TRAP
@@ -126,14 +149,14 @@ ENTRY(vector_swi)
ldr ip, [ip]
mcr p15, 0, ip, c1, c0 @ update control register
#endif
- enable_irq ip
+ enable_irq
str r4, [sp, #-S_OFF]! @ push fifth arg
get_thread_info tsk
ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing
bic scno, scno, #0xff000000 @ mask off SWI op-code
- eor scno, scno, #OS_NUMBER << 20 @ check OS number
+ eor scno, scno, #__NR_SYSCALL_BASE @ check OS number
adr tbl, sys_call_table @ load syscall table pointer
tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
bne __sys_trace
@@ -144,8 +167,8 @@ ENTRY(vector_swi)
add r1, sp, #S_OFF
2: mov why, #0 @ no longer a real syscall
- cmp scno, #ARMSWI_OFFSET
- eor r0, scno, #OS_NUMBER << 20 @ put OS number back
+ cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
+ eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back
bcs arm_syscall
b sys_ni_syscall @ not private func
@@ -190,7 +213,7 @@ ENTRY(sys_call_table)
@ r5 = syscall table
.type sys_syscall, #function
sys_syscall:
- eor scno, r0, #OS_NUMBER << 20
+ eor scno, r0, #__NR_SYSCALL_BASE
cmp scno, #__NR_syscall - __NR_SYSCALL_BASE
cmpne scno, #NR_syscalls @ check range
stmloia sp, {r5, r6} @ shuffle args
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 4039d8c120b..a3d40a0e2b0 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -1,24 +1,11 @@
-#include <linux/config.h> /* for CONFIG_ARCH_xxxx */
+#include <linux/config.h>
+#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/constants.h>
#include <asm/errno.h>
-#include <asm/hardware.h>
-#include <asm/arch/irqs.h>
-#include <asm/arch/entry-macro.S>
-
-#ifndef MODE_SVC
-#define MODE_SVC 0x13
-#endif
-
- .macro zero_fp
-#ifdef CONFIG_FRAME_POINTER
- mov fp, #0
-#endif
- .endm
-
- .text
+#include <asm/thread_info.h>
@ Bad Abort numbers
@ -----------------
@@ -29,113 +16,44 @@
#define BAD_IRQ 3
#define BAD_UNDEFINSTR 4
-#define PT_TRACESYS 0x00000002
-
-@ OS version number used in SWIs
-@ RISC OS is 0
-@ RISC iX is 8
@
-#define OS_NUMBER 9
-#define ARMSWI_OFFSET 0x000f0000
-
+@ Most of the stack format comes from struct pt_regs, but with
+@ the addition of 8 bytes for storing syscall args 5 and 6.
@
-@ Stack format (ensured by USER_* and SVC_*)
-@
-#define S_FRAME_SIZE 72
-#define S_OLD_R0 68
-#define S_PSR 64
-
-#define S_PC 60
-#define S_LR 56
-#define S_SP 52
-#define S_IP 48
-#define S_FP 44
-#define S_R10 40
-#define S_R9 36
-#define S_R8 32
-#define S_R7 28
-#define S_R6 24
-#define S_R5 20
-#define S_R4 16
-#define S_R3 12
-#define S_R2 8
-#define S_R1 4
-#define S_R0 0
#define S_OFF 8
- .macro set_cpsr_c, reg, mode
- msr cpsr_c, \mode
+/*
+ * The SWI code relies on the fact that R0 is at the bottom of the stack
+ * (due to slow/fast restore user regs).
+ */
+#if S_R0 != 0
+#error "Please fix"
+#endif
+
+ .macro zero_fp
+#ifdef CONFIG_FRAME_POINTER
+ mov fp, #0
+#endif
.endm
#if __LINUX_ARM_ARCH__ >= 6
- .macro disable_irq, temp
+ .macro disable_irq
cpsid i
.endm
- .macro enable_irq, temp
+ .macro enable_irq
cpsie i
.endm
#else
- .macro disable_irq, temp
- set_cpsr_c \temp, #PSR_I_BIT | MODE_SVC
+ .macro disable_irq
+ msr cpsr_c, #PSR_I_BIT | SVC_MODE
.endm
- .macro enable_irq, temp
- set_cpsr_c \temp, #MODE_SVC
+ .macro enable_irq
+ msr cpsr_c, #SVC_MODE
.endm
#endif
- .macro save_user_regs
- 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
- 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
- str r0, [sp, #S_OLD_R0] @ Save OLD_R0
- .endm
-
- .macro restore_user_regs
- ldr r1, [sp, #S_PSR] @ Get calling cpsr
- disable_irq ip @ disable IRQs
- 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
- .endm
-
-/*
- * Must be called with IRQs already disabled.
- */
- .macro 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
- .endm
-
-/*
- * Must be called with IRQs already disabled.
- */
- .macro 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 r1 - lr
- mov r0, r0
- add sp, sp, #S_FRAME_SIZE - S_PC
- movs pc, lr @ return & move spsr_svc into cpsr
- .endm
-
- .macro mask_pc, rd, rm
- .endm
-
.macro get_thread_info, rd
mov \rd, sp, lsr #13
mov \rd, \rd, lsl #13
@@ -165,18 +83,3 @@ scno .req r7 @ syscall number
tbl .req r8 @ syscall table pointer
why .req r8 @ Linux syscall (!= 0)
tsk .req r9 @ current thread_info
-
-/*
- * Get the system call number.
- */
- .macro get_scno
-#ifdef CONFIG_ARM_THUMB
- tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
- addne scno, r7, #OS_NUMBER << 20 @ put OS number in
- ldreq scno, [lr, #-4]
-
-#else
- mask_pc lr, lr
- ldr scno, [lr, #-4] @ get SWI instruction
-#endif
- .endm
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 6e31718f600..0078aeb8573 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -578,9 +578,16 @@ EXPORT_SYMBOL(abort);
void __init trap_init(void)
{
- extern void __trap_init(void);
+ extern char __stubs_start[], __stubs_end[];
+ extern char __vectors_start[], __vectors_end[];
- __trap_init();
+ /*
+ * Copy the vectors and stubs (in entry-armv.S) into the
+ * vector page, mapped at 0xffff0000, and ensure these are
+ * visible to the instruction stream.
+ */
+ memcpy((void *)0xffff0000, __vectors_start, __vectors_end - __vectors_start);
+ memcpy((void *)0xffff0200, __stubs_start, __stubs_end - __stubs_start);
flush_icache_range(0xffff0000, 0xffff0000 + PAGE_SIZE);
modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-16 16:13:44 +0000