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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
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