Import of Linux/MIPS 1.1.68

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_ */