mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-24 04:34:08 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
183 lines
3.8 KiB
ArmAsm
183 lines
3.8 KiB
ArmAsm
#include <linux/config.h> /* for CONFIG_ARCH_xxxx */
|
|
#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
|
|
|
|
@ Bad Abort numbers
|
|
@ -----------------
|
|
@
|
|
#define BAD_PREFETCH 0
|
|
#define BAD_DATA 1
|
|
#define BAD_ADDREXCPTN 2
|
|
#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
|
|
|
|
@
|
|
@ 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
|
|
.endm
|
|
|
|
#if __LINUX_ARM_ARCH__ >= 6
|
|
.macro disable_irq, temp
|
|
cpsid i
|
|
.endm
|
|
|
|
.macro enable_irq, temp
|
|
cpsie i
|
|
.endm
|
|
#else
|
|
.macro disable_irq, temp
|
|
set_cpsr_c \temp, #PSR_I_BIT | MODE_SVC
|
|
.endm
|
|
|
|
.macro enable_irq, temp
|
|
set_cpsr_c \temp, #MODE_SVC
|
|
.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
|
|
.endm
|
|
|
|
.macro alignment_trap, rbase, rtemp, sym
|
|
#ifdef CONFIG_ALIGNMENT_TRAP
|
|
#define OFF_CR_ALIGNMENT(x) cr_alignment - x
|
|
|
|
ldr \rtemp, [\rbase, #OFF_CR_ALIGNMENT(\sym)]
|
|
mcr p15, 0, \rtemp, c1, c0
|
|
#endif
|
|
.endm
|
|
|
|
|
|
/*
|
|
* These are the registers used in the syscall handler, and allow us to
|
|
* have in theory up to 7 arguments to a function - r0 to r6.
|
|
*
|
|
* r7 is reserved for the system call number for thumb mode.
|
|
*
|
|
* Note that tbl == why is intentional.
|
|
*
|
|
* We must set at least "tsk" and "why" when calling ret_with_reschedule.
|
|
*/
|
|
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
|