7c6e489b23
This patch changes the ENTRY() macro in asm.h to create a new section for every assembler function, thus providing dcache_clean/invalidate_all and friends with the same --gc-sections goodness that our C functions have. This requires a few minor changes of moving around data (to make sure it ends up in the right section) and changing some libgcc functions (which apparently need to have two names?), but nothing serious. (You may note that some of our assembly functions have data, sometimes even writable, within the same .text section. This has been this way before and I'm not looking to change it for now, although it's not totally clean. Since we don't enforce read-only sections through paging, it doesn't really hurt.) BUG=None TEST=Nyan and Snow still boot. Confirm dcache_invalidate_all is not output into any binary anymore since no one actually uses it. Original-Change-Id: I247b29d6173ba516c8dff59126c93b66f7dc4b8d Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/183891 (cherry picked from commit 4a3f2e45e06cc8592d56c3577f41ff879f10e9cc) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: Ieaa4f2ea9d81c5b9e2b36a772ff9610bdf6446f9 Reviewed-on: http://review.coreboot.org/7451 Tested-by: build bot (Jenkins) Reviewed-by: David Hendricks <dhendrix@chromium.org>
237 lines
4.8 KiB
ArmAsm
237 lines
4.8 KiB
ArmAsm
/*
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* linux/arch/arm/lib/memcpy.S
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*
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* Author: Nicolas Pitre
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* Created: Sep 28, 2005
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* Copyright: MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <arch/asm.h>
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#include "asmlib.h"
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#define LDR1W_SHIFT 0
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#define STR1W_SHIFT 0
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.macro ldr1w ptr reg abort
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W(ldr) \reg, [\ptr], #4
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.endm
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.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
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ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
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.endm
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.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
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ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
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.endm
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.macro ldr1b ptr reg cond=al abort
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ldr\cond\()b \reg, [\ptr], #1
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.endm
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.macro str1w ptr reg abort
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W(str) \reg, [\ptr], #4
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.endm
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.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
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stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
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.endm
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.macro str1b ptr reg cond=al abort
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str\cond\()b \reg, [\ptr], #1
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.endm
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.macro enter reg1 reg2
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stmdb sp!, {r0, \reg1, \reg2}
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.endm
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.macro exit reg1 reg2
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ldmfd sp!, {r0, \reg1, \reg2}
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.endm
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/* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
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ENTRY(memcpy)
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enter r4, lr
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subs r2, r2, #4
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blt 8f
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ands ip, r0, #3
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PLD( pld [r1, #0] )
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bne 9f
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ands ip, r1, #3
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bne 10f
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1: subs r2, r2, #(28)
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stmfd sp!, {r5 - r8}
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blt 5f
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CALGN( ands ip, r0, #31 )
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CALGN( rsb r3, ip, #32 )
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CALGN( sbcnes r4, r3, r2 ) @ C is always set here
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CALGN( bcs 2f )
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CALGN( adr r4, 6f )
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CALGN( subs r2, r2, r3 ) @ C gets set
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CALGN( add pc, r4, ip )
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PLD( pld [r1, #0] )
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2: PLD( subs r2, r2, #96 )
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PLD( pld [r1, #28] )
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PLD( blt 4f )
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PLD( pld [r1, #60] )
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PLD( pld [r1, #92] )
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3: PLD( pld [r1, #124] )
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4: ldr8w r1, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
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subs r2, r2, #32
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str8w r0, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
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bge 3b
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PLD( cmn r2, #96 )
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PLD( bge 4b )
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5: ands ip, r2, #28
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rsb ip, ip, #32
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#if LDR1W_SHIFT > 0
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lsl ip, ip, #LDR1W_SHIFT
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#endif
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addne pc, pc, ip @ C is always clear here
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b 7f
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6:
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.rept (1 << LDR1W_SHIFT)
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W(nop)
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.endr
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ldr1w r1, r3, abort=20f
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ldr1w r1, r4, abort=20f
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ldr1w r1, r5, abort=20f
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ldr1w r1, r6, abort=20f
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ldr1w r1, r7, abort=20f
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ldr1w r1, r8, abort=20f
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ldr1w r1, lr, abort=20f
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#if LDR1W_SHIFT < STR1W_SHIFT
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lsl ip, ip, #STR1W_SHIFT - LDR1W_SHIFT
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#elif LDR1W_SHIFT > STR1W_SHIFT
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lsr ip, ip, #LDR1W_SHIFT - STR1W_SHIFT
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#endif
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add pc, pc, ip
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nop
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.rept (1 << STR1W_SHIFT)
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W(nop)
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.endr
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str1w r0, r3, abort=20f
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str1w r0, r4, abort=20f
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str1w r0, r5, abort=20f
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str1w r0, r6, abort=20f
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str1w r0, r7, abort=20f
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str1w r0, r8, abort=20f
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str1w r0, lr, abort=20f
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CALGN( bcs 2b )
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7: ldmfd sp!, {r5 - r8}
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8: movs r2, r2, lsl #31
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ldr1b r1, r3, ne, abort=21f
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ldr1b r1, r4, cs, abort=21f
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ldr1b r1, ip, cs, abort=21f
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str1b r0, r3, ne, abort=21f
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str1b r0, r4, cs, abort=21f
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str1b r0, ip, cs, abort=21f
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exit r4, pc
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9: rsb ip, ip, #4
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cmp ip, #2
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ldr1b r1, r3, gt, abort=21f
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ldr1b r1, r4, ge, abort=21f
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ldr1b r1, lr, abort=21f
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str1b r0, r3, gt, abort=21f
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str1b r0, r4, ge, abort=21f
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subs r2, r2, ip
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str1b r0, lr, abort=21f
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blt 8b
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ands ip, r1, #3
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beq 1b
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10: bic r1, r1, #3
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cmp ip, #2
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ldr1w r1, lr, abort=21f
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beq 17f
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bgt 18f
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.macro forward_copy_shift pull push
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subs r2, r2, #28
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blt 14f
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CALGN( ands ip, r0, #31 )
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CALGN( rsb ip, ip, #32 )
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CALGN( sbcnes r4, ip, r2 ) @ C is always set here
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CALGN( subcc r2, r2, ip )
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CALGN( bcc 15f )
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11: stmfd sp!, {r5 - r9}
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PLD( pld [r1, #0] )
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PLD( subs r2, r2, #96 )
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PLD( pld [r1, #28] )
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PLD( blt 13f )
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PLD( pld [r1, #60] )
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PLD( pld [r1, #92] )
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12: PLD( pld [r1, #124] )
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13: ldr4w r1, r4, r5, r6, r7, abort=19f
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mov r3, lr, pull #\pull
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subs r2, r2, #32
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ldr4w r1, r8, r9, ip, lr, abort=19f
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orr r3, r3, r4, push #\push
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mov r4, r4, pull #\pull
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orr r4, r4, r5, push #\push
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mov r5, r5, pull #\pull
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orr r5, r5, r6, push #\push
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mov r6, r6, pull #\pull
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orr r6, r6, r7, push #\push
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mov r7, r7, pull #\pull
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orr r7, r7, r8, push #\push
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mov r8, r8, pull #\pull
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orr r8, r8, r9, push #\push
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mov r9, r9, pull #\pull
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orr r9, r9, ip, push #\push
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mov ip, ip, pull #\pull
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orr ip, ip, lr, push #\push
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str8w r0, r3, r4, r5, r6, r7, r8, r9, ip, , abort=19f
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bge 12b
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PLD( cmn r2, #96 )
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PLD( bge 13b )
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ldmfd sp!, {r5 - r9}
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14: ands ip, r2, #28
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beq 16f
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15: mov r3, lr, pull #\pull
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ldr1w r1, lr, abort=21f
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subs ip, ip, #4
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orr r3, r3, lr, push #\push
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str1w r0, r3, abort=21f
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bgt 15b
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CALGN( cmp r2, #0 )
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CALGN( bge 11b )
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16: sub r1, r1, #(\push / 8)
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b 8b
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.endm
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forward_copy_shift pull=8 push=24
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17: forward_copy_shift pull=16 push=16
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18: forward_copy_shift pull=24 push=8
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ENDPROC(memcpy)
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