![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
116 lines
2.6 KiB
ArmAsm
116 lines
2.6 KiB
ArmAsm
/*
|
|
* linux/arch/arm26/lib/csumpartialcopyuser.S
|
|
*
|
|
* Copyright (C) 1995-1998 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/asm_offsets.h>
|
|
|
|
.text
|
|
|
|
.macro save_regs
|
|
stmfd sp!, {r1 - r2, r4 - r9, fp, ip, lr, pc}
|
|
mov r9, sp, lsr #13
|
|
mov r9, r9, lsl #13
|
|
ldr r9, [r9, #TSK_ADDR_LIMIT]
|
|
mov r9, r9, lsr #24
|
|
.endm
|
|
|
|
.macro load_regs,flags
|
|
ldm\flags fp, {r1, r2, r4-r9, fp, sp, pc}^
|
|
.endm
|
|
|
|
.macro load1b, reg1
|
|
tst r9, #0x01
|
|
9999: ldreqbt \reg1, [r0], #1
|
|
ldrneb \reg1, [r0], #1
|
|
.section __ex_table, "a"
|
|
.align 3
|
|
.long 9999b, 6001f
|
|
.previous
|
|
.endm
|
|
|
|
.macro load2b, reg1, reg2
|
|
tst r9, #0x01
|
|
9999: ldreqbt \reg1, [r0], #1
|
|
ldrneb \reg1, [r0], #1
|
|
9998: ldreqbt \reg2, [r0], #1
|
|
ldrneb \reg2, [r0], #1
|
|
.section __ex_table, "a"
|
|
.long 9999b, 6001f
|
|
.long 9998b, 6001f
|
|
.previous
|
|
.endm
|
|
|
|
.macro load1l, reg1
|
|
tst r9, #0x01
|
|
9999: ldreqt \reg1, [r0], #4
|
|
ldrne \reg1, [r0], #4
|
|
.section __ex_table, "a"
|
|
.align 3
|
|
.long 9999b, 6001f
|
|
.previous
|
|
.endm
|
|
|
|
.macro load2l, reg1, reg2
|
|
tst r9, #0x01
|
|
ldmneia r0!, {\reg1, \reg2}
|
|
9999: ldreqt \reg1, [r0], #4
|
|
9998: ldreqt \reg2, [r0], #4
|
|
.section __ex_table, "a"
|
|
.long 9999b, 6001f
|
|
.long 9998b, 6001f
|
|
.previous
|
|
.endm
|
|
|
|
.macro load4l, reg1, reg2, reg3, reg4
|
|
tst r9, #0x01
|
|
ldmneia r0!, {\reg1, \reg2, \reg3, \reg4}
|
|
9999: ldreqt \reg1, [r0], #4
|
|
9998: ldreqt \reg2, [r0], #4
|
|
9997: ldreqt \reg3, [r0], #4
|
|
9996: ldreqt \reg4, [r0], #4
|
|
.section __ex_table, "a"
|
|
.long 9999b, 6001f
|
|
.long 9998b, 6001f
|
|
.long 9997b, 6001f
|
|
.long 9996b, 6001f
|
|
.previous
|
|
.endm
|
|
|
|
/*
|
|
* unsigned int
|
|
* csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
|
|
* r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
|
|
* Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
|
|
*/
|
|
|
|
#define FN_ENTRY ENTRY(csum_partial_copy_from_user)
|
|
|
|
#include "csumpartialcopygeneric.S"
|
|
|
|
/*
|
|
* FIXME: minor buglet here
|
|
* We don't return the checksum for the data present in the buffer. To do
|
|
* so properly, we would have to add in whatever registers were loaded before
|
|
* the fault, which, with the current asm above is not predictable.
|
|
*/
|
|
.align 4
|
|
6001: mov r4, #-EFAULT
|
|
ldr r5, [fp, #4] @ *err_ptr
|
|
str r4, [r5]
|
|
ldmia sp, {r1, r2} @ retrieve dst, len
|
|
add r2, r2, r1
|
|
mov r0, #0 @ zero the buffer
|
|
6002: teq r2, r1
|
|
strneb r0, [r1], #1
|
|
bne 6002b
|
|
load_regs ea
|