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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/powerpc/kernel/misc.S
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/kernel/misc.S')
-rw-r--r--arch/powerpc/kernel/misc.S118
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
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+++ b/arch/powerpc/kernel/misc.S
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * This file contains miscellaneous low-level functions.
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras.
+ *
+ * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
+ *
+ * setjmp/longjmp code by Paul Mackerras.
+ */
+#include <linux/export.h>
+#include <asm/ppc_asm.h>
+#include <asm/unistd.h>
+#include <asm/asm-compat.h>
+#include <asm/asm-offsets.h>
+
+ .text
+
+/*
+ * Returns (address we are running at) - (address we were linked at)
+ * for use before the text and data are mapped to KERNELBASE.
+
+ * add_reloc_offset(x) returns x + reloc_offset().
+ */
+
+_GLOBAL(reloc_offset)
+ li r3, 0
+_GLOBAL(add_reloc_offset)
+ mflr r0
+ bcl 20,31,$+4
+1: mflr r5
+ PPC_LL r4,(2f-1b)(r5)
+ subf r5,r4,r5
+ add r3,r3,r5
+ mtlr r0
+ blr
+_ASM_NOKPROBE_SYMBOL(reloc_offset)
+_ASM_NOKPROBE_SYMBOL(add_reloc_offset)
+
+ .align 3
+2: PPC_LONG 1b
+
+_GLOBAL(setjmp)
+ mflr r0
+ PPC_STL r0,0(r3)
+ PPC_STL r1,SZL(r3)
+ PPC_STL r2,2*SZL(r3)
+#ifdef CONFIG_PPC32
+ mfcr r12
+ stmw r12, 3*SZL(r3)
+#else
+ mfcr r0
+ PPC_STL r0,3*SZL(r3)
+ PPC_STL r13,4*SZL(r3)
+ PPC_STL r14,5*SZL(r3)
+ PPC_STL r15,6*SZL(r3)
+ PPC_STL r16,7*SZL(r3)
+ PPC_STL r17,8*SZL(r3)
+ PPC_STL r18,9*SZL(r3)
+ PPC_STL r19,10*SZL(r3)
+ PPC_STL r20,11*SZL(r3)
+ PPC_STL r21,12*SZL(r3)
+ PPC_STL r22,13*SZL(r3)
+ PPC_STL r23,14*SZL(r3)
+ PPC_STL r24,15*SZL(r3)
+ PPC_STL r25,16*SZL(r3)
+ PPC_STL r26,17*SZL(r3)
+ PPC_STL r27,18*SZL(r3)
+ PPC_STL r28,19*SZL(r3)
+ PPC_STL r29,20*SZL(r3)
+ PPC_STL r30,21*SZL(r3)
+ PPC_STL r31,22*SZL(r3)
+#endif
+ li r3,0
+ blr
+
+_GLOBAL(longjmp)
+#ifdef CONFIG_PPC32
+ lmw r12, 3*SZL(r3)
+ mtcrf 0x38, r12
+#else
+ PPC_LL r13,4*SZL(r3)
+ PPC_LL r14,5*SZL(r3)
+ PPC_LL r15,6*SZL(r3)
+ PPC_LL r16,7*SZL(r3)
+ PPC_LL r17,8*SZL(r3)
+ PPC_LL r18,9*SZL(r3)
+ PPC_LL r19,10*SZL(r3)
+ PPC_LL r20,11*SZL(r3)
+ PPC_LL r21,12*SZL(r3)
+ PPC_LL r22,13*SZL(r3)
+ PPC_LL r23,14*SZL(r3)
+ PPC_LL r24,15*SZL(r3)
+ PPC_LL r25,16*SZL(r3)
+ PPC_LL r26,17*SZL(r3)
+ PPC_LL r27,18*SZL(r3)
+ PPC_LL r28,19*SZL(r3)
+ PPC_LL r29,20*SZL(r3)
+ PPC_LL r30,21*SZL(r3)
+ PPC_LL r31,22*SZL(r3)
+ PPC_LL r0,3*SZL(r3)
+ mtcrf 0x38,r0
+#endif
+ PPC_LL r0,0(r3)
+ PPC_LL r1,SZL(r3)
+ PPC_LL r2,2*SZL(r3)
+ mtlr r0
+ mr. r3, r4
+ bnelr
+ li r3, 1
+ blr
+
+_GLOBAL(current_stack_frame)
+ PPC_LL r3,0(r1)
+ blr
+EXPORT_SYMBOL(current_stack_frame)