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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
| commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
| tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm/lib/csumpartialcopyuser.S | |
| parent | Initial commit. (diff) | |
| download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip | |
Adding upstream version 6.1.76.upstream/6.1.76
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.S | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/arm/lib/csumpartialcopyuser.S b/arch/arm/lib/csumpartialcopyuser.S new file mode 100644 index 000000000..6928781e6 --- /dev/null +++ b/arch/arm/lib/csumpartialcopyuser.S @@ -0,0 +1,83 @@ +/* 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 |