-#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
@ -----------------
#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
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
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