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yaml
---
r: 529
b: refs/heads/master
c: fc67b16
h: refs/heads/master
i:
  527: b7dfe2c
v: v3
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Linus Torvalds committed Apr 27, 2005
1 parent 8a032af commit 783dad1
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Showing 94 changed files with 1,195 additions and 1,037 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 2d29306b231a1a0e7a70166c10e4c0f917b21334
refs/heads/master: fc67b16ecaf6ebde04096030c268adddade023f1
5 changes: 0 additions & 5 deletions trunk/arch/arm/kernel/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -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
20 changes: 20 additions & 0 deletions trunk/arch/arm/kernel/asm-offsets.c
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Expand Up @@ -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();
Expand Down
67 changes: 28 additions & 39 deletions trunk/arch/arm/kernel/entry-armv.S
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Original file line number Diff line number Diff line change
Expand Up @@ -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"

Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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

Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -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
Expand All @@ -544,14 +545,15 @@ 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
ldr lr, [pc, lr, lsl #2]
movs pc, lr @ Changes mode and branches
.endm

.globl __stubs_start
__stubs_start:
/*
* Interrupt dispatcher
Expand Down Expand Up @@ -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

Expand Down
65 changes: 44 additions & 21 deletions trunk/arch/arm/kernel/entry-common.S
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Original file line number Diff line number Diff line change
Expand Up @@ -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
/*
Expand All @@ -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.
Expand All @@ -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:
Expand All @@ -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.
Expand Down Expand Up @@ -116,24 +122,41 @@ 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
ldr ip, __cr_alignment
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
Expand All @@ -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

Expand Down Expand Up @@ -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
Expand Down
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