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https://github.com/edk2-porting/linux-next.git
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6f5405bc2e
memmove may be called from module code copy_pages(btrfs), and it may
call memcpy, which may call back to C code, so it needs to use
_GLOBAL_TOC to set up r2 correctly.
This fixes following error when I tried to boot an le guest:
Vector: 300 (Data Access) at [c000000073f97210]
pc: c000000000015004: enable_kernel_altivec+0x24/0x80
lr: c000000000058fbc: enter_vmx_copy+0x3c/0x60
sp: c000000073f97490
msr: 8000000002009033
dar: d000000001d50170
dsisr: 40000000
current = 0xc0000000734c0000
paca = 0xc00000000fff0000 softe: 0 irq_happened: 0x01
pid = 815, comm = mktemp
enter ? for help
[c000000073f974f0] c000000000058fbc enter_vmx_copy+0x3c/0x60
[c000000073f97510] c000000000057d34 memcpy_power7+0x274/0x840
[c000000073f97610] d000000001c3179c copy_pages+0xfc/0x110 [btrfs]
[c000000073f97660] d000000001c3c248 memcpy_extent_buffer+0xe8/0x160 [btrfs]
[c000000073f97700] d000000001be4be8 setup_items_for_insert+0x208/0x4a0 [btrfs]
[c000000073f97820] d000000001be50b4 btrfs_insert_empty_items+0xf4/0x140 [btrfs]
[c000000073f97890] d000000001bfed30 insert_with_overflow+0x70/0x180 [btrfs]
[c000000073f97900] d000000001bff174 btrfs_insert_dir_item+0x114/0x2f0 [btrfs]
[c000000073f979a0] d000000001c1f92c btrfs_add_link+0x10c/0x370 [btrfs]
[c000000073f97a40] d000000001c20e94 btrfs_create+0x204/0x270 [btrfs]
[c000000073f97b00] c00000000026d438 vfs_create+0x178/0x210
[c000000073f97b50] c000000000270a70 do_last+0x9f0/0xe90
[c000000073f97c20] c000000000271010 path_openat+0x100/0x810
[c000000073f97ce0] c000000000272ea8 do_filp_open+0x58/0xd0
[c000000073f97dc0] c00000000025ade8 do_sys_open+0x1b8/0x300
[c000000073f97e30] c00000000000a008 syscall_exit+0x0/0x7c
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
120 lines
1.9 KiB
ArmAsm
120 lines
1.9 KiB
ArmAsm
/*
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* String handling functions for PowerPC.
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*
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* Copyright (C) 1996 Paul Mackerras.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/processor.h>
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#include <asm/errno.h>
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#include <asm/ppc_asm.h>
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_GLOBAL(memset)
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neg r0,r3
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rlwimi r4,r4,8,16,23
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andi. r0,r0,7 /* # bytes to be 8-byte aligned */
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rlwimi r4,r4,16,0,15
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cmplw cr1,r5,r0 /* do we get that far? */
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rldimi r4,r4,32,0
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PPC_MTOCRF(1,r0)
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mr r6,r3
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blt cr1,8f
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beq+ 3f /* if already 8-byte aligned */
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subf r5,r0,r5
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bf 31,1f
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stb r4,0(r6)
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addi r6,r6,1
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1: bf 30,2f
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sth r4,0(r6)
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addi r6,r6,2
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2: bf 29,3f
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stw r4,0(r6)
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addi r6,r6,4
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3: srdi. r0,r5,6
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clrldi r5,r5,58
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mtctr r0
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beq 5f
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4: std r4,0(r6)
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std r4,8(r6)
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std r4,16(r6)
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std r4,24(r6)
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std r4,32(r6)
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std r4,40(r6)
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std r4,48(r6)
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std r4,56(r6)
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addi r6,r6,64
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bdnz 4b
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5: srwi. r0,r5,3
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clrlwi r5,r5,29
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PPC_MTOCRF(1,r0)
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beq 8f
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bf 29,6f
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std r4,0(r6)
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std r4,8(r6)
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std r4,16(r6)
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std r4,24(r6)
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addi r6,r6,32
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6: bf 30,7f
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std r4,0(r6)
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std r4,8(r6)
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addi r6,r6,16
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7: bf 31,8f
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std r4,0(r6)
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addi r6,r6,8
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8: cmpwi r5,0
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PPC_MTOCRF(1,r5)
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beqlr+
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bf 29,9f
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stw r4,0(r6)
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addi r6,r6,4
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9: bf 30,10f
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sth r4,0(r6)
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addi r6,r6,2
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10: bflr 31
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stb r4,0(r6)
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blr
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_GLOBAL_TOC(memmove)
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cmplw 0,r3,r4
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bgt backwards_memcpy
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b memcpy
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_GLOBAL(backwards_memcpy)
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rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */
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add r6,r3,r5
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add r4,r4,r5
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beq 2f
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andi. r0,r6,3
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mtctr r7
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bne 5f
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1: lwz r7,-4(r4)
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lwzu r8,-8(r4)
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stw r7,-4(r6)
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stwu r8,-8(r6)
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bdnz 1b
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andi. r5,r5,7
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2: cmplwi 0,r5,4
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blt 3f
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lwzu r0,-4(r4)
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subi r5,r5,4
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stwu r0,-4(r6)
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3: cmpwi 0,r5,0
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beqlr
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mtctr r5
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4: lbzu r0,-1(r4)
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stbu r0,-1(r6)
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bdnz 4b
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blr
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5: mtctr r0
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6: lbzu r7,-1(r4)
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stbu r7,-1(r6)
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bdnz 6b
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subf r5,r0,r5
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rlwinm. r7,r5,32-3,3,31
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beq 2b
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mtctr r7
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b 1b
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