diff options
Diffstat (limited to 'arch/arm/kernel/entry-header.S')
| -rw-r--r-- | arch/arm/kernel/entry-header.S | 143 |
1 files changed, 23 insertions, 120 deletions
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 |