1 files changed, 407 insertions, 0 deletions
diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h
new file mode 100644
index 000000000..28d6d9364
--- /dev/null
+++ b/arch/mips/include/asm/stackframe.h
@@ -0,0 +1,407 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 95, 96, 99, 2001 Ralf Baechle
+ * Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ * Copyright (C) 2007  Maciej W. Rozycki
+ */
+#ifndef _ASM_STACKFRAME_H
+#define _ASM_STACKFRAME_H
+
+#include <linux/threads.h>
+
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/mipsregs.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+#define STATMASK 0x3f
+#else
+#define STATMASK 0x1f
+#endif
+
+		.macro	SAVE_AT
+		.set	push
+		.set	noat
+		LONG_S	$1, PT_R1(sp)
+		.set	pop
+		.endm
+
+		.macro	SAVE_TEMP
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+		mflhxu	v1
+		LONG_S	v1, PT_LO(sp)
+		mflhxu	v1
+		LONG_S	v1, PT_HI(sp)
+		mflhxu	v1
+		LONG_S	v1, PT_ACX(sp)
+#elif !defined(CONFIG_CPU_MIPSR6)
+		mfhi	v1
+#endif
+#ifdef CONFIG_32BIT
+		LONG_S	$8, PT_R8(sp)
+		LONG_S	$9, PT_R9(sp)
+#endif
+		LONG_S	$10, PT_R10(sp)
+		LONG_S	$11, PT_R11(sp)
+		LONG_S	$12, PT_R12(sp)
+#if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6)
+		LONG_S	v1, PT_HI(sp)
+		mflo	v1
+#endif
+		LONG_S	$13, PT_R13(sp)
+		LONG_S	$14, PT_R14(sp)
+		LONG_S	$15, PT_R15(sp)
+		LONG_S	$24, PT_R24(sp)
+#if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6)
+		LONG_S	v1, PT_LO(sp)
+#endif
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+		/*
+		 * The Octeon multiplier state is affected by general
+		 * multiply instructions. It must be saved before and
+		 * kernel code might corrupt it
+		 */
+		jal     octeon_mult_save
+#endif
+		.endm
+
+		.macro	SAVE_STATIC
+		LONG_S	$16, PT_R16(sp)
+		LONG_S	$17, PT_R17(sp)
+		LONG_S	$18, PT_R18(sp)
+		LONG_S	$19, PT_R19(sp)
+		LONG_S	$20, PT_R20(sp)
+		LONG_S	$21, PT_R21(sp)
+		LONG_S	$22, PT_R22(sp)
+		LONG_S	$23, PT_R23(sp)
+		LONG_S	$30, PT_R30(sp)
+		.endm
+
+#ifdef CONFIG_SMP
+		.macro	get_saved_sp	/* SMP variation */
+		ASM_CPUID_MFC0	k0, ASM_SMP_CPUID_REG
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+		lui	k1, %hi(kernelsp)
+#else
+		lui	k1, %highest(kernelsp)
+		daddiu	k1, %higher(kernelsp)
+		dsll	k1, 16
+		daddiu	k1, %hi(kernelsp)
+		dsll	k1, 16
+#endif
+		LONG_SRL	k0, SMP_CPUID_PTRSHIFT
+		LONG_ADDU	k1, k0
+		LONG_L	k1, %lo(kernelsp)(k1)
+		.endm
+
+		.macro	set_saved_sp stackp temp temp2
+		ASM_CPUID_MFC0	\temp, ASM_SMP_CPUID_REG
+		LONG_SRL	\temp, SMP_CPUID_PTRSHIFT
+		LONG_S	\stackp, kernelsp(\temp)
+		.endm
+#else /* !CONFIG_SMP */
+		.macro	get_saved_sp	/* Uniprocessor variation */
+#ifdef CONFIG_CPU_JUMP_WORKAROUNDS
+		/*
+		 * Clear BTB (branch target buffer), forbid RAS (return address
+		 * stack) to workaround the Out-of-order Issue in Loongson2F
+		 * via its diagnostic register.
+		 */
+		move	k0, ra
+		jal	1f
+		 nop
+1:		jal	1f
+		 nop
+1:		jal	1f
+		 nop
+1:		jal	1f
+		 nop
+1:		move	ra, k0
+		li	k0, 3
+		mtc0	k0, $22
+#endif /* CONFIG_CPU_JUMP_WORKAROUNDS */
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+		lui	k1, %hi(kernelsp)
+#else
+		lui	k1, %highest(kernelsp)
+		daddiu	k1, %higher(kernelsp)
+		dsll	k1, k1, 16
+		daddiu	k1, %hi(kernelsp)
+		dsll	k1, k1, 16
+#endif
+		LONG_L	k1, %lo(kernelsp)(k1)
+		.endm
+
+		.macro	set_saved_sp stackp temp temp2
+		LONG_S	\stackp, kernelsp
+		.endm
+#endif
+
+		.macro	SAVE_SOME
+		.set	push
+		.set	noat
+		.set	reorder
+		mfc0	k0, CP0_STATUS
+		sll	k0, 3		/* extract cu0 bit */
+		.set	noreorder
+		bltz	k0, 8f
+		 move	k1, sp
+		.set	reorder
+		/* Called from user mode, new stack. */
+		get_saved_sp
+#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
+8:		move	k0, sp
+		PTR_SUBU sp, k1, PT_SIZE
+#else
+		.set	at=k0
+8:		PTR_SUBU k1, PT_SIZE
+		.set	noat
+		move	k0, sp
+		move	sp, k1
+#endif
+		LONG_S	k0, PT_R29(sp)
+		LONG_S	$3, PT_R3(sp)
+		/*
+		 * You might think that you don't need to save $0,
+		 * but the FPU emulator and gdb remote debug stub
+		 * need it to operate correctly
+		 */
+		LONG_S	$0, PT_R0(sp)
+		mfc0	v1, CP0_STATUS
+		LONG_S	$2, PT_R2(sp)
+		LONG_S	v1, PT_STATUS(sp)
+		LONG_S	$4, PT_R4(sp)
+		mfc0	v1, CP0_CAUSE
+		LONG_S	$5, PT_R5(sp)
+		LONG_S	v1, PT_CAUSE(sp)
+		LONG_S	$6, PT_R6(sp)
+		MFC0	v1, CP0_EPC
+		LONG_S	$7, PT_R7(sp)
+#ifdef CONFIG_64BIT
+		LONG_S	$8, PT_R8(sp)
+		LONG_S	$9, PT_R9(sp)
+#endif
+		LONG_S	v1, PT_EPC(sp)
+		LONG_S	$25, PT_R25(sp)
+		LONG_S	$28, PT_R28(sp)
+		LONG_S	$31, PT_R31(sp)
+		ori	$28, sp, _THREAD_MASK
+		xori	$28, _THREAD_MASK
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+		.set    mips64
+		pref    0, 0($28)       /* Prefetch the current pointer */
+#endif
+		.set	pop
+		.endm
+
+		.macro	SAVE_ALL
+		SAVE_SOME
+		SAVE_AT
+		SAVE_TEMP
+		SAVE_STATIC
+		.endm
+
+		.macro	RESTORE_AT
+		.set	push
+		.set	noat
+		LONG_L	$1,  PT_R1(sp)
+		.set	pop
+		.endm
+
+		.macro	RESTORE_TEMP
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+		/* Restore the Octeon multiplier state */
+		jal	octeon_mult_restore
+#endif
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+		LONG_L	$24, PT_ACX(sp)
+		mtlhx	$24
+		LONG_L	$24, PT_HI(sp)
+		mtlhx	$24
+		LONG_L	$24, PT_LO(sp)
+		mtlhx	$24
+#elif !defined(CONFIG_CPU_MIPSR6)
+		LONG_L	$24, PT_LO(sp)
+		mtlo	$24
+		LONG_L	$24, PT_HI(sp)
+		mthi	$24
+#endif
+#ifdef CONFIG_32BIT
+		LONG_L	$8, PT_R8(sp)
+		LONG_L	$9, PT_R9(sp)
+#endif
+		LONG_L	$10, PT_R10(sp)
+		LONG_L	$11, PT_R11(sp)
+		LONG_L	$12, PT_R12(sp)
+		LONG_L	$13, PT_R13(sp)
+		LONG_L	$14, PT_R14(sp)
+		LONG_L	$15, PT_R15(sp)
+		LONG_L	$24, PT_R24(sp)
+		.endm
+
+		.macro	RESTORE_STATIC
+		LONG_L	$16, PT_R16(sp)
+		LONG_L	$17, PT_R17(sp)
+		LONG_L	$18, PT_R18(sp)
+		LONG_L	$19, PT_R19(sp)
+		LONG_L	$20, PT_R20(sp)
+		LONG_L	$21, PT_R21(sp)
+		LONG_L	$22, PT_R22(sp)
+		LONG_L	$23, PT_R23(sp)
+		LONG_L	$30, PT_R30(sp)
+		.endm
+
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+
+		.macro	RESTORE_SOME
+		.set	push
+		.set	reorder
+		.set	noat
+		mfc0	a0, CP0_STATUS
+		li	v1, 0xff00
+		ori	a0, STATMASK
+		xori	a0, STATMASK
+		mtc0	a0, CP0_STATUS
+		and	a0, v1
+		LONG_L	v0, PT_STATUS(sp)
+		nor	v1, $0, v1
+		and	v0, v1
+		or	v0, a0
+		mtc0	v0, CP0_STATUS
+		LONG_L	$31, PT_R31(sp)
+		LONG_L	$28, PT_R28(sp)
+		LONG_L	$25, PT_R25(sp)
+		LONG_L	$7,  PT_R7(sp)
+		LONG_L	$6,  PT_R6(sp)
+		LONG_L	$5,  PT_R5(sp)
+		LONG_L	$4,  PT_R4(sp)
+		LONG_L	$3,  PT_R3(sp)
+		LONG_L	$2,  PT_R2(sp)
+		.set	pop
+		.endm
+
+		.macro	RESTORE_SP_AND_RET
+		.set	push
+		.set	noreorder
+		LONG_L	k0, PT_EPC(sp)
+		LONG_L	sp, PT_R29(sp)
+		jr	k0
+		 rfe
+		.set	pop
+		.endm
+
+#else
+		.macro	RESTORE_SOME
+		.set	push
+		.set	reorder
+		.set	noat
+		mfc0	a0, CP0_STATUS
+		ori	a0, STATMASK
+		xori	a0, STATMASK
+		mtc0	a0, CP0_STATUS
+		li	v1, 0xff00
+		and	a0, v1
+		LONG_L	v0, PT_STATUS(sp)
+		nor	v1, $0, v1
+		and	v0, v1
+		or	v0, a0
+		mtc0	v0, CP0_STATUS
+		LONG_L	v1, PT_EPC(sp)
+		MTC0	v1, CP0_EPC
+		LONG_L	$31, PT_R31(sp)
+		LONG_L	$28, PT_R28(sp)
+		LONG_L	$25, PT_R25(sp)
+#ifdef CONFIG_64BIT
+		LONG_L	$8, PT_R8(sp)
+		LONG_L	$9, PT_R9(sp)
+#endif
+		LONG_L	$7,  PT_R7(sp)
+		LONG_L	$6,  PT_R6(sp)
+		LONG_L	$5,  PT_R5(sp)
+		LONG_L	$4,  PT_R4(sp)
+		LONG_L	$3,  PT_R3(sp)
+		LONG_L	$2,  PT_R2(sp)
+		.set	pop
+		.endm
+
+		.macro	RESTORE_SP_AND_RET
+		LONG_L	sp, PT_R29(sp)
+		.set	arch=r4000
+		eret
+		.set	mips0
+		.endm
+
+#endif
+
+		.macro	RESTORE_SP
+		LONG_L	sp, PT_R29(sp)
+		.endm
+
+		.macro	RESTORE_ALL
+		RESTORE_TEMP
+		RESTORE_STATIC
+		RESTORE_AT
+		RESTORE_SOME
+		RESTORE_SP
+		.endm
+
+		.macro	RESTORE_ALL_AND_RET
+		RESTORE_TEMP
+		RESTORE_STATIC
+		RESTORE_AT
+		RESTORE_SOME
+		RESTORE_SP_AND_RET
+		.endm
+
+/*
+ * Move to kernel mode and disable interrupts.
+ * Set cp0 enable bit as sign that we're running on the kernel stack
+ */
+		.macro	CLI
+		mfc0	t0, CP0_STATUS
+		li	t1, ST0_CU0 | STATMASK
+		or	t0, t1
+		xori	t0, STATMASK
+		mtc0	t0, CP0_STATUS
+		irq_disable_hazard
+		.endm
+
+/*
+ * Move to kernel mode and enable interrupts.
+ * Set cp0 enable bit as sign that we're running on the kernel stack
+ */
+		.macro	STI
+		mfc0	t0, CP0_STATUS
+		li	t1, ST0_CU0 | STATMASK
+		or	t0, t1
+		xori	t0, STATMASK & ~1
+		mtc0	t0, CP0_STATUS
+		irq_enable_hazard
+		.endm
+
+/*
+ * Just move to kernel mode and leave interrupts as they are.  Note
+ * for the R3000 this means copying the previous enable from IEp.
+ * Set cp0 enable bit as sign that we're running on the kernel stack
+ */
+		.macro	KMODE
+		mfc0	t0, CP0_STATUS
+		li	t1, ST0_CU0 | (STATMASK & ~1)
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+		andi	t2, t0, ST0_IEP
+		srl	t2, 2
+		or	t0, t2
+#endif
+		or	t0, t1
+		xori	t0, STATMASK & ~1
+		mtc0	t0, CP0_STATUS
+		irq_disable_hazard
+		.endm
+
+#endif /* _ASM_STACKFRAME_H */