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-rw-r--r--arch/powerpc/lib/ldstfp.S375
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+/*
+ * Floating-point, VMX/Altivec and VSX loads and stores
+ * for use in instruction emulation.
+ *
+ * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+#include <asm/ppc-opcode.h>
+#include <asm/reg.h>
+#include <asm/asm-offsets.h>
+#include <linux/errno.h>
+
+#define STKFRM (PPC_MIN_STKFRM + 16)
+
+ .macro extab instr,handler
+ .section __ex_table,"a"
+ PPC_LONG \instr,\handler
+ .previous
+ .endm
+
+ .macro inst32 op
+reg = 0
+ .rept 32
+20: \op reg,0,r4
+ b 3f
+ extab 20b,99f
+reg = reg + 1
+ .endr
+ .endm
+
+/* Get the contents of frN into fr0; N is in r3. */
+_GLOBAL(get_fpr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* fr0 is already in fr0 */
+ nop
+reg = 1
+ .rept 31
+ fmr fr0,reg
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Put the contents of fr0 into frN; N is in r3. */
+_GLOBAL(put_fpr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* fr0 is already in fr0 */
+ nop
+reg = 1
+ .rept 31
+ fmr reg,fr0
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Load FP reg N from float at *p. N is in r3, p in r4. */
+_GLOBAL(do_lfs)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+1: li r9,-EFAULT
+2: lfs fr0,0(r4)
+ li r9,0
+3: bl put_fpr
+ beq cr7,4f
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Load FP reg N from double at *p. N is in r3, p in r4. */
+_GLOBAL(do_lfd)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+1: li r9,-EFAULT
+2: lfd fr0,0(r4)
+ li r9,0
+3: beq cr7,4f
+ bl put_fpr
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store FP reg N to float at *p. N is in r3, p in r4. */
+_GLOBAL(do_stfs)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+ bl get_fpr
+1: li r9,-EFAULT
+2: stfs fr0,0(r4)
+ li r9,0
+3: beq cr7,4f
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store FP reg N to double at *p. N is in r3, p in r4. */
+_GLOBAL(do_stfd)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+ bl get_fpr
+1: li r9,-EFAULT
+2: stfd fr0,0(r4)
+ li r9,0
+3: beq cr7,4f
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+#ifdef CONFIG_ALTIVEC
+/* Get the contents of vrN into vr0; N is in r3. */
+_GLOBAL(get_vr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* vr0 is already in vr0 */
+ nop
+reg = 1
+ .rept 31
+ vor vr0,reg,reg /* assembler doesn't know vmr? */
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Put the contents of vr0 into vrN; N is in r3. */
+_GLOBAL(put_vr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* vr0 is already in vr0 */
+ nop
+reg = 1
+ .rept 31
+ vor reg,vr0,vr0
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Load vector reg N from *p. N is in r3, p in r4. */
+_GLOBAL(do_lvx)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VEC@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stvx vr0,r1,r8
+1: li r9,-EFAULT
+2: lvx vr0,0,r4
+ li r9,0
+3: beq cr7,4f
+ bl put_vr
+ lvx vr0,r1,r8
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store vector reg N to *p. N is in r3, p in r4. */
+_GLOBAL(do_stvx)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VEC@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stvx vr0,r1,r8
+ bl get_vr
+1: li r9,-EFAULT
+2: stvx vr0,0,r4
+ li r9,0
+3: beq cr7,4f
+ lvx vr0,r1,r8
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef CONFIG_VSX
+/* Get the contents of vsrN into vsr0; N is in r3. */
+_GLOBAL(get_vsr)
+ mflr r0
+ rlwinm r3,r3,3,0x1f8
+ bcl 20,31,1f
+ blr /* vsr0 is already in vsr0 */
+ nop
+reg = 1
+ .rept 63
+ XXLOR(0,reg,reg)
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Put the contents of vsr0 into vsrN; N is in r3. */
+_GLOBAL(put_vsr)
+ mflr r0
+ rlwinm r3,r3,3,0x1f8
+ bcl 20,31,1f
+ blr /* vr0 is already in vr0 */
+ nop
+reg = 1
+ .rept 63
+ XXLOR(reg,0,0)
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Load VSX reg N from vector doubleword *p. N is in r3, p in r4. */
+_GLOBAL(do_lxvd2x)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VSX@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ STXVD2X(0,r1,r8)
+1: li r9,-EFAULT
+2: LXVD2X(0,0,r4)
+ li r9,0
+3: beq cr7,4f
+ bl put_vsr
+ LXVD2X(0,r1,r8)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store VSX reg N to vector doubleword *p. N is in r3, p in r4. */
+_GLOBAL(do_stxvd2x)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VSX@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ STXVD2X(0,r1,r8)
+ bl get_vsr
+1: li r9,-EFAULT
+2: STXVD2X(0,0,r4)
+ li r9,0
+3: beq cr7,4f
+ LXVD2X(0,r1,r8)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+#endif /* CONFIG_VSX */
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