1#include <linux/config.h> 2#include <linux/init.h> 3#include <linux/linkage.h> 4 5#include <asm/assembler.h> 6#include <asm/constants.h> 7#include <asm/errno.h> 8#include <asm/thread_info.h> 9 10@ Bad Abort numbers 11@ ----------------- 12@ 13#define BAD_PREFETCH 0 14#define BAD_DATA 1 15#define BAD_ADDREXCPTN 2 16#define BAD_IRQ 3 17#define BAD_UNDEFINSTR 4 18 19@ 20@ Most of the stack format comes from struct pt_regs, but with 21@ the addition of 8 bytes for storing syscall args 5 and 6. 22@ 23#define S_OFF 8 24 25/* 26 * The SWI code relies on the fact that R0 is at the bottom of the stack 27 * (due to slow/fast restore user regs). 28 */ 29#if S_R0 != 0 30#error "Please fix" 31#endif 32 33 .macro zero_fp 34#ifdef CONFIG_FRAME_POINTER 35 mov fp, #0 36#endif 37 .endm 38 39#if __LINUX_ARM_ARCH__ >= 6 40 .macro disable_irq 41 cpsid i 42 .endm 43 44 .macro enable_irq 45 cpsie i 46 .endm 47#else 48 .macro disable_irq 49 msr cpsr_c, #PSR_I_BIT | SVC_MODE 50 .endm 51 52 .macro enable_irq 53 msr cpsr_c, #SVC_MODE 54 .endm 55#endif 56 57 .macro get_thread_info, rd 58 mov \rd, sp, lsr #13 59 mov \rd, \rd, lsl #13 60 .endm 61 62 .macro alignment_trap, rbase, rtemp, sym 63#ifdef CONFIG_ALIGNMENT_TRAP 64#define OFF_CR_ALIGNMENT(x) cr_alignment - x 65 66 ldr \rtemp, [\rbase, #OFF_CR_ALIGNMENT(\sym)] 67 mcr p15, 0, \rtemp, c1, c0 68#endif 69 .endm 70 71 72/* 73 * These are the registers used in the syscall handler, and allow us to 74 * have in theory up to 7 arguments to a function - r0 to r6. 75 * 76 * r7 is reserved for the system call number for thumb mode. 77 * 78 * Note that tbl == why is intentional. 79 * 80 * We must set at least "tsk" and "why" when calling ret_with_reschedule. 81 */ 82scno .req r7 @ syscall number 83tbl .req r8 @ syscall table pointer 84why .req r8 @ Linux syscall (!= 0) 85tsk .req r9 @ current thread_info 86