Revert "libc/memset: Implement function in assembler"
This reverts commit e7d344de01.
This reverts the patch https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/5313 due to a timing issue with the merge. The merge occurred at the same time as the additional comments and thusly were were not seen until the merge was done. This reverts the change and additional patches from Alexei will follow to address the concerns expressed in the orignal patch.
Change-Id: Iae5f6403c93ac13ceeda29463883fcd4c437f2b7
This commit is contained in:
Mark Dykes
parent
e7d344de01
commit
f5402ef7a8
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@ -1,74 +0,0 @@
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/*
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* Copyright (c) 2020, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <asm_macros.S>
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.syntax unified
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.global memset
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/* -----------------------------------------------------------------------
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* void memset(void *dst, int val, size_t count)
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*
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* Copy the value of 'val' (converted to an unsigned char) into
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* each of the first 'count' characters of the object pointed to by 'dst'.
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*
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* Returns the value of 'dst'.
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* -----------------------------------------------------------------------
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*/
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func memset
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cmp r2, #0
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bxeq lr /* return if 'count' = 0 */
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mov r12, r0 /* keep r0 */
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tst r0, #3
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beq aligned /* 4-bytes aligned */
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/* Unaligned 'dst' */
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unaligned:
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strb r1, [r12], #1
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subs r2, r2, #1
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bxeq lr /* return if 0 */
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tst r12, #3
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bne unaligned /* continue while unaligned */
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/* 4-bytes aligned */
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aligned:bfi r1, r1, #8, #8 /* propagate 'val' */
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bfi r1, r1, #16, #16
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mov r3, r1
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cmp r2, #16
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blo less_16
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push {r4, lr}
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mov r4, r1
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mov lr, r1
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cmp r2, #32
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blo less_32
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write_32:
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stmia r12!, {r1, r3, r4, lr} /* write 32 bytes in a loop */
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stmia r12!, {r1, r3, r4, lr}
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subs r2, r2, #32
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popeq {r4, pc} /* return if 0 */
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cmp r2, #32
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bhs write_32
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less_32:cmp r2, #16
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stmiahs r12!, {r1, r3, r4, lr} /* write 16 bytes */
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popeq {r4, pc} /* return if 16 */
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pop {r4, lr}
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less_16:lsls r2, r2, #29 /* C = r2[3]; N = r2[2]; Z = r2[2:0] */
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stmiacs r12!, {r1, r3} /* write 8 bytes */
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bxeq lr /* return if 8 */
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strmi r1, [r12], #4 /* write 4 bytes */
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lsls r2, r2, #1 /* N = r2[1]; Z = r2[0] */
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strhmi r1, [r12], #2 /* write 2 bytes */
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strbne r1, [r12] /* write 1 byte */
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bx lr
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endfunc memset
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@ -1,79 +0,0 @@
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/*
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* Copyright (c) 2020, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <asm_macros.S>
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.global memset
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/* -----------------------------------------------------------------------
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* void memset(void *dst, int val, size_t count)
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*
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* Copy the value of 'val' (converted to an unsigned char) into
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* each of the first 'count' characters of the object pointed to by 'dst'.
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*
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* Returns the value of 'dst'.
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* -----------------------------------------------------------------------
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*/
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func memset
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cbz w2, exit /* exit if 'count' = 0 */
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mov x3, x0 /* keep x0 */
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tst x0, #7
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b.eq aligned /* 8-bytes aligned */
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/* Unaligned 'dst' */
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unaligned:
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strb w1, [x3], #1
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subs w2, w2, #1
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b.eq exit /* exit if 0 */
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tst x3, #7
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b.ne unaligned /* continue while unaligned */
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/* 8-bytes aligned */
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aligned:cbz x1, x1_zero
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bfi w1, w1, #8, #8 /* propagate 'val' */
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bfi w1, w1, #16, #16
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bfi x1, x1, #32, #32
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x1_zero:ands w4, w2, #~0x3f
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b.eq less_64
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write_64:
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.rept 4
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stp x1, x1, [x3], #16 /* write 64 bytes in a loop */
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.endr
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subs w4, w4, #64
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b.ne write_64
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ands w2, w2, #0x3f
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b.eq exit /* exit if 0 */
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less_64:tbz w2, #5, less_32 /* < 32 bytes */
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stp x1, x1, [x3], #16 /* write 32 bytes */
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stp x1, x1, [x3], #16
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ands w2, w2, #0x1f
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b.eq exit
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less_32:tbz w2, #4, less_16 /* < 16 bytes */
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stp x1, x1, [x3], #16 /* write 16 bytes */
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ands w2, w2, #0xf
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b.eq exit
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less_16:tbz w2, #3, less_8 /* < 8 bytes */
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str x1, [x3], #8 /* write 8 bytes */
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ands w2, w2, #7
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b.eq exit
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less_8: tbz w2, #2, less_4 /* < 4 bytes */
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str w1, [x3], #4 /* write 4 bytes */
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ands w2, w2, #3
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b.eq exit
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less_4: tbz w2, #1, less_2 /* < 2 bytes */
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strh w1, [x3], #2 /* write 2 bytes */
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tbz w2, #0, exit
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less_2: strb w1, [x3] /* write 1 byte */
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exit: ret
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endfunc memset
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@ -1,5 +1,5 @@
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#
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# Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
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# Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
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#
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# SPDX-License-Identifier: BSD-3-Clause
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#
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@ -13,6 +13,7 @@ LIBC_SRCS := $(addprefix lib/libc/, \
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memcpy.c \
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memmove.c \
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memrchr.c \
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memset.c \
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printf.c \
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putchar.c \
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puts.c \
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@ -27,14 +28,8 @@ LIBC_SRCS := $(addprefix lib/libc/, \
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ifeq (${ARCH},aarch64)
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LIBC_SRCS += $(addprefix lib/libc/aarch64/, \
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memset.S \
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setjmp.S)
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endif
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ifeq (${ARCH},aarch32)
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LIBC_SRCS += $(addprefix lib/libc/aarch32/, \
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memset.S)
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endif
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INCLUDES += -Iinclude/lib/libc \
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-Iinclude/lib/libc/$(ARCH) \
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@ -0,0 +1,18 @@
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/*
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* Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stddef.h>
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#include <string.h>
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void *memset(void *dst, int val, size_t count)
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{
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char *ptr = dst;
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while (count--)
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*ptr++ = val;
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return dst;
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}
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@ -1,5 +1,5 @@
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#
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# Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
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# Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
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# Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
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#
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# SPDX-License-Identifier: BSD-3-Clause
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@ -69,11 +69,11 @@ TF_CFLAGS += -Wsign-compare -nostdlib
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# override with necessary libc files for the Tegra platform
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override LIBC_SRCS := $(addprefix lib/libc/, \
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aarch64/memset.S \
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aarch64/setjmp.S \
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assert.c \
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memcpy.c \
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memmove.c \
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memset.c \
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printf.c \
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putchar.c \
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strlen.c \
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