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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/arm/lib/csumpartialcopyuser.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/arm/lib/csumpartialcopyuser.S')
-rw-r--r--arch/arm/lib/csumpartialcopyuser.S83
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/arm/lib/csumpartialcopyuser.S b/arch/arm/lib/csumpartialcopyuser.S
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * linux/arch/arm/lib/csumpartialcopyuser.S
+ *
+ * Copyright (C) 1995-1998 Russell King
+ *
+ * 27/03/03 Ian Molton Clean up CONFIG_CPU
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+#include <asm/asm-offsets.h>
+
+ .text
+
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ .macro save_regs
+ mrc p15, 0, ip, c3, c0, 0
+ stmfd sp!, {r1, r2, r4 - r8, ip, lr}
+ uaccess_enable ip
+ .endm
+
+ .macro load_regs
+ ldmfd sp!, {r1, r2, r4 - r8, ip, lr}
+ mcr p15, 0, ip, c3, c0, 0
+ ret lr
+ .endm
+#else
+ .macro save_regs
+ stmfd sp!, {r1, r2, r4 - r8, lr}
+ .endm
+
+ .macro load_regs
+ ldmfd sp!, {r1, r2, r4 - r8, pc}
+ .endm
+#endif
+
+ .macro load1b, reg1
+ ldrusr \reg1, r0, 1
+ .endm
+
+ .macro load2b, reg1, reg2
+ ldrusr \reg1, r0, 1
+ ldrusr \reg2, r0, 1
+ .endm
+
+ .macro load1l, reg1
+ ldrusr \reg1, r0, 4
+ .endm
+
+ .macro load2l, reg1, reg2
+ ldrusr \reg1, r0, 4
+ ldrusr \reg2, r0, 4
+ .endm
+
+ .macro load4l, reg1, reg2, reg3, reg4
+ ldrusr \reg1, r0, 4
+ ldrusr \reg2, r0, 4
+ ldrusr \reg3, r0, 4
+ ldrusr \reg4, r0, 4
+ .endm
+
+/*
+ * unsigned int
+ * csum_partial_copy_from_user(const char *src, char *dst, int len)
+ * r0 = src, r1 = dst, r2 = len
+ * Returns : r0 = checksum or 0
+ */
+
+#define FN_ENTRY ENTRY(csum_partial_copy_from_user)
+#define FN_EXIT ENDPROC(csum_partial_copy_from_user)
+
+#include "csumpartialcopygeneric.S"
+
+/*
+ * We report fault by returning 0 csum - impossible in normal case, since
+ * we start with 0xffffffff for initial sum.
+ */
+ .pushsection .text.fixup,"ax"
+ .align 4
+9001: mov r0, #0
+ load_regs
+ .popsection