1#include <linux/init.h> 2#include <linux/linkage.h> 3 4#include <asm/assembler.h> 5#include <asm/asm-offsets.h> 6#include <asm/errno.h> 7#include <asm/thread_info.h> 8 9@ Bad Abort numbers 10@ ----------------- 11@ 12#define BAD_PREFETCH 0 13#define BAD_DATA 1 14#define BAD_ADDREXCPTN 2 15#define BAD_IRQ 3 16#define BAD_UNDEFINSTR 4 17 18@ 19@ Most of the stack format comes from struct pt_regs, but with 20@ the addition of 8 bytes for storing syscall args 5 and 6. 21@ This _must_ remain a multiple of 8 for EABI. 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 .macro get_thread_info, rd 40 mov \rd, sp, lsr #13 41 mov \rd, \rd, lsl #13 42 .endm 43 44 .macro alignment_trap, rtemp 45#ifdef CONFIG_ALIGNMENT_TRAP 46 ldr \rtemp, .LCcralign 47 ldr \rtemp, [\rtemp] 48 mcr p15, 0, \rtemp, c1, c0 49#endif 50 .endm 51 52 53/* 54 * These are the registers used in the syscall handler, and allow us to 55 * have in theory up to 7 arguments to a function - r0 to r6. 56 * 57 * r7 is reserved for the system call number for thumb mode. 58 * 59 * Note that tbl == why is intentional. 60 * 61 * We must set at least "tsk" and "why" when calling ret_with_reschedule. 62 */ 63scno .req r7 @ syscall number 64tbl .req r8 @ syscall table pointer 65why .req r8 @ Linux syscall (!= 0) 66tsk .req r9 @ current thread_info 67