f6869e7fe6
This series adds support for building the powerpc 64-bit LE kernel using the new ABI v2. We already supported running ABI v2 userspace programs but this adds support for building the kernel itself using the new ABI.
221 lines
4 KiB
ArmAsm
221 lines
4 KiB
ArmAsm
/*
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* Copyright (C) 2002 Paul Mackerras, IBM Corp.
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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/ppc_asm.h>
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.align 7
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_GLOBAL_TOC(memcpy)
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BEGIN_FTR_SECTION
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#ifdef __LITTLE_ENDIAN__
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cmpdi cr7,r5,0
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#else
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std r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* save destination pointer for return value */
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#endif
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FTR_SECTION_ELSE
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#ifndef SELFTEST
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b memcpy_power7
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#endif
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ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
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#ifdef __LITTLE_ENDIAN__
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/* dumb little-endian memcpy that will get replaced at runtime */
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addi r9,r3,-1
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addi r4,r4,-1
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beqlr cr7
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mtctr r5
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1: lbzu r10,1(r4)
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stbu r10,1(r9)
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bdnz 1b
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blr
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#else
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PPC_MTOCRF(0x01,r5)
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cmpldi cr1,r5,16
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neg r6,r3 # LS 3 bits = # bytes to 8-byte dest bdry
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andi. r6,r6,7
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dcbt 0,r4
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blt cr1,.Lshort_copy
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/* Below we want to nop out the bne if we're on a CPU that has the
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CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit
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cleared.
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At the time of writing the only CPU that has this combination of bits
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set is Power6. */
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BEGIN_FTR_SECTION
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nop
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FTR_SECTION_ELSE
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bne .Ldst_unaligned
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ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \
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CPU_FTR_UNALIGNED_LD_STD)
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.Ldst_aligned:
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addi r3,r3,-16
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BEGIN_FTR_SECTION
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andi. r0,r4,7
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bne .Lsrc_unaligned
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END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
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srdi r7,r5,4
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ld r9,0(r4)
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addi r4,r4,-8
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mtctr r7
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andi. r5,r5,7
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bf cr7*4+0,2f
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addi r3,r3,8
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addi r4,r4,8
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mr r8,r9
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blt cr1,3f
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1: ld r9,8(r4)
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std r8,8(r3)
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2: ldu r8,16(r4)
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stdu r9,16(r3)
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bdnz 1b
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3: std r8,8(r3)
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beq 3f
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addi r3,r3,16
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.Ldo_tail:
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bf cr7*4+1,1f
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lwz r9,8(r4)
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addi r4,r4,4
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stw r9,0(r3)
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addi r3,r3,4
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1: bf cr7*4+2,2f
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lhz r9,8(r4)
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addi r4,r4,2
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sth r9,0(r3)
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addi r3,r3,2
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2: bf cr7*4+3,3f
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lbz r9,8(r4)
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stb r9,0(r3)
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3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
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blr
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.Lsrc_unaligned:
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srdi r6,r5,3
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addi r5,r5,-16
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subf r4,r0,r4
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srdi r7,r5,4
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sldi r10,r0,3
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cmpdi cr6,r6,3
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andi. r5,r5,7
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mtctr r7
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subfic r11,r10,64
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add r5,r5,r0
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bt cr7*4+0,0f
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ld r9,0(r4) # 3+2n loads, 2+2n stores
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ld r0,8(r4)
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sld r6,r9,r10
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ldu r9,16(r4)
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srd r7,r0,r11
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sld r8,r0,r10
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or r7,r7,r6
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blt cr6,4f
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ld r0,8(r4)
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# s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12
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b 2f
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0: ld r0,0(r4) # 4+2n loads, 3+2n stores
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ldu r9,8(r4)
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sld r8,r0,r10
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addi r3,r3,-8
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blt cr6,5f
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ld r0,8(r4)
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srd r12,r9,r11
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sld r6,r9,r10
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ldu r9,16(r4)
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or r12,r8,r12
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srd r7,r0,r11
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sld r8,r0,r10
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addi r3,r3,16
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beq cr6,3f
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# d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9
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1: or r7,r7,r6
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ld r0,8(r4)
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std r12,8(r3)
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2: srd r12,r9,r11
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sld r6,r9,r10
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ldu r9,16(r4)
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or r12,r8,r12
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stdu r7,16(r3)
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srd r7,r0,r11
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sld r8,r0,r10
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bdnz 1b
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3: std r12,8(r3)
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or r7,r7,r6
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4: std r7,16(r3)
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5: srd r12,r9,r11
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or r12,r8,r12
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std r12,24(r3)
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beq 4f
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cmpwi cr1,r5,8
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addi r3,r3,32
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sld r9,r9,r10
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ble cr1,6f
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ld r0,8(r4)
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srd r7,r0,r11
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or r9,r7,r9
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6:
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bf cr7*4+1,1f
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rotldi r9,r9,32
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stw r9,0(r3)
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addi r3,r3,4
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1: bf cr7*4+2,2f
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rotldi r9,r9,16
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sth r9,0(r3)
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addi r3,r3,2
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2: bf cr7*4+3,3f
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rotldi r9,r9,8
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stb r9,0(r3)
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3: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
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blr
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.Ldst_unaligned:
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PPC_MTOCRF(0x01,r6) # put #bytes to 8B bdry into cr7
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subf r5,r6,r5
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li r7,0
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cmpldi cr1,r5,16
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bf cr7*4+3,1f
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lbz r0,0(r4)
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stb r0,0(r3)
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addi r7,r7,1
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1: bf cr7*4+2,2f
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lhzx r0,r7,r4
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sthx r0,r7,r3
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addi r7,r7,2
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2: bf cr7*4+1,3f
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lwzx r0,r7,r4
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stwx r0,r7,r3
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3: PPC_MTOCRF(0x01,r5)
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add r4,r6,r4
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add r3,r6,r3
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b .Ldst_aligned
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.Lshort_copy:
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bf cr7*4+0,1f
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lwz r0,0(r4)
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lwz r9,4(r4)
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addi r4,r4,8
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stw r0,0(r3)
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stw r9,4(r3)
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addi r3,r3,8
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1: bf cr7*4+1,2f
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lwz r0,0(r4)
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addi r4,r4,4
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stw r0,0(r3)
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addi r3,r3,4
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2: bf cr7*4+2,3f
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lhz r0,0(r4)
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addi r4,r4,2
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sth r0,0(r3)
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addi r3,r3,2
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3: bf cr7*4+3,4f
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lbz r0,0(r4)
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stb r0,0(r3)
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4: ld r3,-STACKFRAMESIZE+STK_REG(R31)(r1) /* return dest pointer */
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blr
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#endif
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