diff options
Diffstat (limited to 'include/asm-mips/stackframe.h')
| -rw-r--r-- | include/asm-mips/stackframe.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/include/asm-mips/stackframe.h b/include/asm-mips/stackframe.h new file mode 100644 index 000000000..0c3c4699c --- /dev/null +++ b/include/asm-mips/stackframe.h @@ -0,0 +1,176 @@ +/* + * include/asm-mips/stackframe.h + * + * Copyright (C) 1994 Waldorf GMBH + * written by Ralf Baechle + */ + +#ifndef _ASM_MIPS_STACKFRAME_H_ +#define _ASM_MIPS_STACKFRAME_H_ + +/* + * Stack layout for all exceptions: + * + * ptrace needs to have all regs on the stack. + * if the order here is changed, it needs to be + * updated in asm/mips/fork.c:copy_process, asm/mips/signal.c:do_signal, + * asm-mips/ptrace.c, include/asm-mips/ptrace.h + * and asm-mips/ptrace + */ + +/* + * Offsets into the Interrupt stackframe. + */ +#define FR_REG1 0 +#define FR_REG2 4 +#define FR_REG3 8 +#define FR_REG4 12 +#define FR_REG5 16 +#define FR_REG6 20 +#define FR_REG7 24 +#define FR_REG8 28 +#define FR_REG9 32 +#define FR_REG10 36 +#define FR_REG11 40 +#define FR_REG12 44 +#define FR_REG13 48 +#define FR_REG14 52 +#define FR_REG15 56 +#define FR_REG16 60 +#define FR_REG17 64 +#define FR_REG18 68 +#define FR_REG19 72 +#define FR_REG20 76 +#define FR_REG21 80 +#define FR_REG22 84 +#define FR_REG23 88 +#define FR_REG24 92 +#define FR_REG25 96 + +/* + * $26 (k0) and $27 (k1) not saved + */ +#define FR_REG28 100 +#define FR_REG29 104 +#define FR_REG30 108 +#define FR_REG31 112 + +/* + * Saved special registers + */ +#define FR_LO ((FR_REG31) + 4) +#define FR_HI ((FR_LO) + 4) + +/* + * Saved cp0 registers follow + */ +#define FR_STATUS ((FR_HI) + 4) +#define FR_EPC ((FR_STATUS) + 4) +#define FR_ERROREPC ((FR_EPC) + 4) + +/* + * Some goodies... + */ +#define FR_INTERRUPT ((FR_ERROREPC) + 4) +#define FR_ORIG_REG2 ((FR_INTERRUPT) + 4) + +/* + * Size of stack frame + */ +#define FR_SIZE ((FR_ORIG_REG2) + 4) + +#define SAVE_ALL \ + mfc0 k0,CP0_STATUS; \ + andi k0,k0,0x18; /* extract KSU bits */ \ + beq zero,k0,1f; \ + move k1,sp; \ + /* \ + * Called from user mode, new stack \ + */ \ + lw k1,_kernelsp; \ +1: move k0,sp; \ + subu sp,k1,FR_SIZE; \ + sw k0,FR_REG29(sp); \ + sw $2,FR_REG2(sp); \ + sw $2,FR_ORIG_REG2(sp); \ + mfc0 v0,CP0_STATUS; \ + sw v0,FR_STATUS(sp); \ + mfc0 v0,CP0_EPC; \ + sw v0,FR_EPC(sp); \ + mfc0 v0,CP0_ERROREPC; \ + sw v0,FR_ERROREPC(sp); \ + mfhi v0; \ + sw v0,FR_HI(sp); \ + mflo v0; \ + sw v0,FR_LO(sp); \ + sw $1,FR_REG1(sp); \ + sw $3,FR_REG3(sp); \ + sw $4,FR_REG4(sp); \ + sw $5,FR_REG5(sp); \ + sw $6,FR_REG6(sp); \ + sw $7,FR_REG7(sp); \ + sw $8,FR_REG8(sp); \ + sw $9,FR_REG9(sp); \ + sw $10,FR_REG10(sp); \ + sw $11,FR_REG11(sp); \ + sw $12,FR_REG12(sp); \ + sw $13,FR_REG13(sp); \ + sw $14,FR_REG14(sp); \ + sw $15,FR_REG15(sp); \ + sw $16,FR_REG16(sp); \ + sw $17,FR_REG17(sp); \ + sw $18,FR_REG18(sp); \ + sw $19,FR_REG19(sp); \ + sw $20,FR_REG20(sp); \ + sw $21,FR_REG21(sp); \ + sw $22,FR_REG22(sp); \ + sw $23,FR_REG23(sp); \ + sw $24,FR_REG24(sp); \ + sw $25,FR_REG25(sp); \ + sw $28,FR_REG28(sp); \ + sw $30,FR_REG30(sp); \ + sw $31,FR_REG31(sp) + +#define RESTORE_ALL \ + lw v0,FR_ERROREPC(sp); \ + lw v1,FR_EPC(sp); \ + mtc0 v0,CP0_ERROREPC; \ + lw v0,FR_HI(sp); \ + mtc0 v1,CP0_EPC; \ + lw v1,FR_LO(sp); \ + mthi v0; \ + lw v0,FR_STATUS(sp); \ + mtlo v1; \ + mtc0 v0,CP0_STATUS; \ + lw $31,FR_REG31(sp); \ + lw $30,FR_REG30(sp); \ + lw $28,FR_REG28(sp); \ + lw $25,FR_REG25(sp); \ + lw $24,FR_REG24(sp); \ + lw $23,FR_REG23(sp); \ + lw $22,FR_REG22(sp); \ + lw $21,FR_REG21(sp); \ + lw $20,FR_REG20(sp); \ + lw $19,FR_REG19(sp); \ + lw $18,FR_REG18(sp); \ + lw $17,FR_REG17(sp); \ + lw $16,FR_REG16(sp); \ + lw $15,FR_REG15(sp); \ + lw $14,FR_REG14(sp); \ + lw $13,FR_REG13(sp); \ + lw $12,FR_REG12(sp); \ + lw $11,FR_REG11(sp); \ + lw $10,FR_REG10(sp); \ + lw $9,FR_REG9(sp); \ + lw $8,FR_REG8(sp); \ + lw $7,FR_REG7(sp); \ + lw $6,FR_REG6(sp); \ + lw $5,FR_REG5(sp); \ + lw $4,FR_REG4(sp); \ + lw $3,FR_REG3(sp); \ + lw $2,FR_REG2(sp); \ + lw $1,FR_REG1(sp); \ + lw sp,FR_REG29(sp); /* Deallocate stack */ \ + eret + +#endif /* _ASM_MIPS_STACKFRAME_H_ */ |