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From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: [PATCH 3/4] MIPS: import exception registers restoring macros from linux kernel
Date: Tue, 10 Nov 2015 10:27:15 +0300	[thread overview]
Message-ID: <1447140436-29099-4-git-send-email-antonynpavlov@gmail.com> (raw)
In-Reply-To: <1447140436-29099-1-git-send-email-antonynpavlov@gmail.com>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/include/asm/stackframe.h | 87 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h
index 0266ec6..abfa2d2 100644
--- a/arch/mips/include/asm/stackframe.h
+++ b/arch/mips/include/asm/stackframe.h
@@ -15,6 +15,8 @@
 #include <asm/mipsregs.h>
 #include <asm/asm-offsets.h>
 
+#define STATMASK 0x1f
+
 		.macro	SAVE_AT
 		.set	push
 		.set	noat
@@ -102,4 +104,89 @@
 		SAVE_STATIC
 		.endm
 
+		.macro	RESTORE_AT
+		.set	push
+		.set	noat
+		LONG_L	$1,  PT_R1(sp)
+		.set	pop
+		.endm
+
+		.macro	RESTORE_TEMP
+		LONG_L	$24, PT_LO(sp)
+		mtlo	$24
+		LONG_L	$24, PT_HI(sp)
+		mthi	$24
+#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
+
+		.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
+
+		.macro	RESTORE_ALL_AND_RET
+		RESTORE_TEMP
+		RESTORE_STATIC
+		RESTORE_AT
+		RESTORE_SOME
+		RESTORE_SP_AND_RET
+		.endm
+
 #endif /* _ASM_STACKFRAME_H */
-- 
2.6.2


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  parent reply	other threads:[~2015-11-10  7:27 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-10  7:27 [PATCH 0/4] MIPS: support return from exception; allow user to pass incorrect address to md command Antony Pavlov
2015-11-10  7:27 ` [PATCH 1/4] MIPS: traps.c: separate registers print stuff to show_regs() Antony Pavlov
2015-11-10  7:27 ` [PATCH 2/4] MIPS: avoid excessive exception Antony Pavlov
2015-11-10  7:27 ` Antony Pavlov [this message]
2015-11-10  7:27 ` [PATCH 4/4] MIPS: allow user to pass incorrect address to md command Antony Pavlov
2015-11-11  7:40 ` [PATCH 0/4] MIPS: support return from exception; " Sascha Hauer

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