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4e93cb00 MG |
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 | */ | |
63 | scno .req r7 @ syscall number | |
64 | tbl .req r8 @ syscall table pointer | |
65 | why .req r8 @ Linux syscall (!= 0) | |
66 | tsk .req r9 @ current thread_info |