forked from mirrors/linux
[PATCH] powerpc: merge align.c
This patch merges align.c, the result isn't quite what was in ppc64 nor what was in ppc32 :) It should implement all the functionalities of both though. Kumar, since you played with that in the past, I suppose you have some test cases for verifying that it works properly before I dig out the 601 machine ? :) Since it's likely that I won't be able to test all scenario, code inspection is much welcome. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
Paul Mackerras
parent
6defa38b37
commit
5daf9071b5
6 changed files with 281 additions and 555 deletions
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@ -12,7 +12,7 @@ CFLAGS_btext.o += -fPIC
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endif
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obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
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irq.o signal_32.o pmc.o vdso.o
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irq.o align.o signal_32.o pmc.o vdso.o
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obj-y += vdso32/
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obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
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signal_64.o ptrace32.o systbl.o \
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@ -7,6 +7,9 @@
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* PowerPC 403GCX/405GP modifications.
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* Copyright (c) 2001-2002 PPC64 team, IBM Corp
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* 64-bit and Power4 support
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* Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp
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* <benh@kernel.crashing.org>
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* Merge ppc32 and ppc64 implementations
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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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@ -38,10 +41,15 @@ struct aligninfo {
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#define F 8 /* to/from fp regs */
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#define U 0x10 /* update index register */
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#define M 0x20 /* multiple load/store */
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#define SW 0x40 /* byte swap */
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#define SW 0x40 /* byte swap int or ... */
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#define S 0x40 /* ... single-precision fp */
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#define SX 0x40 /* byte count in XER */
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#define HARD 0x80 /* string, stwcx. */
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#define DCBZ 0x5f /* 8xx/82xx dcbz faults when cache not enabled */
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#define SWAP(a, b) (t = (a), (a) = (b), (b) = t)
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/*
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* The PowerPC stores certain bits of the instruction that caused the
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* alignment exception in the DSISR register. This array maps those
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@ -57,14 +65,14 @@ static struct aligninfo aligninfo[128] = {
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{ 2, LD+SE }, /* 00 0 0101: lha */
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{ 2, ST }, /* 00 0 0110: sth */
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{ 4, LD+M }, /* 00 0 0111: lmw */
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{ 4, LD+F }, /* 00 0 1000: lfs */
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{ 4, LD+F+S }, /* 00 0 1000: lfs */
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{ 8, LD+F }, /* 00 0 1001: lfd */
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{ 4, ST+F }, /* 00 0 1010: stfs */
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{ 4, ST+F+S }, /* 00 0 1010: stfs */
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{ 8, ST+F }, /* 00 0 1011: stfd */
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INVALID, /* 00 0 1100 */
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{ 8, LD }, /* 00 0 1101: ld */
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{ 8, LD }, /* 00 0 1101: ld/ldu/lwa */
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INVALID, /* 00 0 1110 */
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{ 8, ST }, /* 00 0 1111: std */
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{ 8, ST }, /* 00 0 1111: std/stdu */
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{ 4, LD+U }, /* 00 1 0000: lwzu */
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INVALID, /* 00 1 0001 */
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{ 4, ST+U }, /* 00 1 0010: stwu */
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@ -73,9 +81,9 @@ static struct aligninfo aligninfo[128] = {
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{ 2, LD+SE+U }, /* 00 1 0101: lhau */
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{ 2, ST+U }, /* 00 1 0110: sthu */
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{ 4, ST+M }, /* 00 1 0111: stmw */
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{ 4, LD+F+U }, /* 00 1 1000: lfsu */
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{ 4, LD+F+S+U }, /* 00 1 1000: lfsu */
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{ 8, LD+F+U }, /* 00 1 1001: lfdu */
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{ 4, ST+F+U }, /* 00 1 1010: stfsu */
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{ 4, ST+F+S+U }, /* 00 1 1010: stfsu */
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{ 8, ST+F+U }, /* 00 1 1011: stfdu */
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INVALID, /* 00 1 1100 */
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INVALID, /* 00 1 1101 */
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@ -89,10 +97,10 @@ static struct aligninfo aligninfo[128] = {
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{ 4, LD+SE }, /* 01 0 0101: lwax */
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INVALID, /* 01 0 0110 */
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INVALID, /* 01 0 0111 */
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{ 0, LD }, /* 01 0 1000: lswx */
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{ 0, LD }, /* 01 0 1001: lswi */
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{ 0, ST }, /* 01 0 1010: stswx */
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{ 0, ST }, /* 01 0 1011: stswi */
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{ 4, LD+M+HARD+SX }, /* 01 0 1000: lswx */
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{ 4, LD+M+HARD }, /* 01 0 1001: lswi */
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{ 4, ST+M+HARD+SX }, /* 01 0 1010: stswx */
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{ 4, ST+M+HARD }, /* 01 0 1011: stswi */
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INVALID, /* 01 0 1100 */
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{ 8, LD+U }, /* 01 0 1101: ldu */
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INVALID, /* 01 0 1110 */
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@ -115,7 +123,7 @@ static struct aligninfo aligninfo[128] = {
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INVALID, /* 01 1 1111 */
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INVALID, /* 10 0 0000 */
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INVALID, /* 10 0 0001 */
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{ 0, ST }, /* 10 0 0010: stwcx. */
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INVALID, /* 10 0 0010: stwcx. */
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INVALID, /* 10 0 0011 */
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INVALID, /* 10 0 0100 */
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INVALID, /* 10 0 0101 */
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@ -144,7 +152,7 @@ static struct aligninfo aligninfo[128] = {
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INVALID, /* 10 1 1100 */
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INVALID, /* 10 1 1101 */
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INVALID, /* 10 1 1110 */
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{ L1_CACHE_BYTES, ST }, /* 10 1 1111: dcbz */
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{ 0, ST+HARD }, /* 10 1 1111: dcbz */
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{ 4, LD }, /* 11 0 0000: lwzx */
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INVALID, /* 11 0 0001 */
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{ 4, ST }, /* 11 0 0010: stwx */
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@ -153,9 +161,9 @@ static struct aligninfo aligninfo[128] = {
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{ 2, LD+SE }, /* 11 0 0101: lhax */
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{ 2, ST }, /* 11 0 0110: sthx */
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INVALID, /* 11 0 0111 */
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{ 4, LD+F }, /* 11 0 1000: lfsx */
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{ 4, LD+F+S }, /* 11 0 1000: lfsx */
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{ 8, LD+F }, /* 11 0 1001: lfdx */
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{ 4, ST+F }, /* 11 0 1010: stfsx */
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{ 4, ST+F+S }, /* 11 0 1010: stfsx */
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{ 8, ST+F }, /* 11 0 1011: stfdx */
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INVALID, /* 11 0 1100 */
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{ 8, LD+M }, /* 11 0 1101: lmd */
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@ -169,9 +177,9 @@ static struct aligninfo aligninfo[128] = {
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{ 2, LD+SE+U }, /* 11 1 0101: lhaux */
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{ 2, ST+U }, /* 11 1 0110: sthux */
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INVALID, /* 11 1 0111 */
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{ 4, LD+F+U }, /* 11 1 1000: lfsux */
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{ 4, LD+F+S+U }, /* 11 1 1000: lfsux */
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{ 8, LD+F+U }, /* 11 1 1001: lfdux */
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{ 4, ST+F+U }, /* 11 1 1010: stfsux */
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{ 4, ST+F+S+U }, /* 11 1 1010: stfsux */
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{ 8, ST+F+U }, /* 11 1 1011: stfdux */
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INVALID, /* 11 1 1100 */
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INVALID, /* 11 1 1101 */
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@ -179,45 +187,175 @@ static struct aligninfo aligninfo[128] = {
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INVALID, /* 11 1 1111 */
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};
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#define SWAP(a, b) (t = (a), (a) = (b), (b) = t)
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/*
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* Create a DSISR value from the instruction
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*/
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static inline unsigned make_dsisr(unsigned instr)
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{
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unsigned dsisr;
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/* create a DSISR value from the instruction */
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dsisr = (instr & 0x03ff0000) >> 16; /* bits 6:15 --> 22:31 */
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if ( IS_XFORM(instr) ) {
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dsisr |= (instr & 0x00000006) << 14; /* bits 29:30 --> 15:16 */
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dsisr |= (instr & 0x00000040) << 8; /* bit 25 --> 17 */
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dsisr |= (instr & 0x00000780) << 3; /* bits 21:24 --> 18:21 */
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/* bits 6:15 --> 22:31 */
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dsisr = (instr & 0x03ff0000) >> 16;
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if (IS_XFORM(instr)) {
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/* bits 29:30 --> 15:16 */
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dsisr |= (instr & 0x00000006) << 14;
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/* bit 25 --> 17 */
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dsisr |= (instr & 0x00000040) << 8;
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/* bits 21:24 --> 18:21 */
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dsisr |= (instr & 0x00000780) << 3;
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} else {
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/* bit 5 --> 17 */
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dsisr |= (instr & 0x04000000) >> 12;
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/* bits 1: 4 --> 18:21 */
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dsisr |= (instr & 0x78000000) >> 17;
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/* bits 30:31 --> 12:13 */
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if (IS_DSFORM(instr))
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dsisr |= (instr & 0x00000003) << 18;
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}
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else {
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dsisr |= (instr & 0x04000000) >> 12; /* bit 5 --> 17 */
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dsisr |= (instr & 0x78000000) >> 17; /* bits 1: 4 --> 18:21 */
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if ( IS_DSFORM(instr) ) {
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dsisr |= (instr & 0x00000003) << 18; /* bits 30:31 --> 12:13 */
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}
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}
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return dsisr;
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}
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int
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fix_alignment(struct pt_regs *regs)
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/*
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* The dcbz (data cache block zero) instruction
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* gives an alignment fault if used on non-cacheable
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* memory. We handle the fault mainly for the
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* case when we are running with the cache disabled
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* for debugging.
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*/
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static int emulate_dcbz(struct pt_regs *regs, unsigned char __user *addr)
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{
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long __user *p;
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int i, size;
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#ifdef __powerpc64__
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size = ppc64_caches.dline_size;
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#else
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size = L1_CACHE_BYTES;
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#endif
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p = (long __user *) (regs->dar & -size);
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if (user_mode(regs) && !access_ok(VERIFY_WRITE, p, size))
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return -EFAULT;
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for (i = 0; i < size / sizeof(long); ++i)
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if (__put_user(0, p+i))
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return -EFAULT;
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return 1;
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}
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/*
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* Emulate load & store multiple instructions
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* On 64-bit machines, these instructions only affect/use the
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* bottom 4 bytes of each register, and the loads clear the
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* top 4 bytes of the affected register.
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*/
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#ifdef CONFIG_PPC64
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#define REG_BYTE(rp, i) *((u8 *)((rp) + ((i) >> 2)) + ((i) & 3) + 4)
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#else
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#define REG_BYTE(rp, i) *((u8 *)(rp) + (i))
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#endif
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static int emulate_multiple(struct pt_regs *regs, unsigned char __user *addr,
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unsigned int reg, unsigned int nb,
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unsigned int flags, unsigned int instr)
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{
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unsigned long *rptr;
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unsigned int nb0, i;
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/*
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* We do not try to emulate 8 bytes multiple as they aren't really
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* available in our operating environments and we don't try to
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* emulate multiples operations in kernel land as they should never
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* be used/generated there at least not on unaligned boundaries
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*/
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if (unlikely((nb > 4) || !user_mode(regs)))
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return 0;
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/* lmw, stmw, lswi/x, stswi/x */
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nb0 = 0;
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if (flags & HARD) {
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if (flags & SX) {
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nb = regs->xer & 127;
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if (nb == 0)
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return 1;
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} else {
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if (__get_user(instr,
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(unsigned int __user *)regs->nip))
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return -EFAULT;
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nb = (instr >> 11) & 0x1f;
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if (nb == 0)
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nb = 32;
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}
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if (nb + reg * 4 > 128) {
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nb0 = nb + reg * 4 - 128;
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nb = 128 - reg * 4;
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}
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} else {
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/* lwm, stmw */
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nb = (32 - reg) * 4;
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}
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if (!access_ok((flags & ST ? VERIFY_WRITE: VERIFY_READ), addr, nb+nb0))
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return -EFAULT; /* bad address */
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rptr = ®s->gpr[reg];
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if (flags & LD) {
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/*
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* This zeroes the top 4 bytes of the affected registers
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* in 64-bit mode, and also zeroes out any remaining
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* bytes of the last register for lsw*.
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*/
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memset(rptr, 0, ((nb + 3) / 4) * sizeof(unsigned long));
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if (nb0 > 0)
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memset(®s->gpr[0], 0,
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((nb0 + 3) / 4) * sizeof(unsigned long));
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for (i = 0; i < nb; ++i)
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if (__get_user(REG_BYTE(rptr, i), addr + i))
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return -EFAULT;
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if (nb0 > 0) {
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rptr = ®s->gpr[0];
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addr += nb;
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for (i = 0; i < nb0; ++i)
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if (__get_user(REG_BYTE(rptr, i), addr + i))
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return -EFAULT;
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}
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} else {
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for (i = 0; i < nb; ++i)
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if (__put_user(REG_BYTE(rptr, i), addr + i))
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return -EFAULT;
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if (nb0 > 0) {
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rptr = ®s->gpr[0];
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addr += nb;
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for (i = 0; i < nb0; ++i)
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if (__put_user(REG_BYTE(rptr, i), addr + i))
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return -EFAULT;
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}
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}
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return 1;
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}
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/*
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* Called on alignment exception. Attempts to fixup
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*
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* Return 1 on success
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* Return 0 if unable to handle the interrupt
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* Return -EFAULT if data address is bad
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*/
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int fix_alignment(struct pt_regs *regs)
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{
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unsigned int instr, nb, flags;
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int t;
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unsigned long reg, areg;
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unsigned long i;
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int ret;
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unsigned dsisr;
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unsigned int reg, areg;
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unsigned int dsisr;
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unsigned char __user *addr;
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unsigned char __user *p;
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unsigned long __user *lp;
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int ret, t;
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union {
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long ll;
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u64 ll;
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double dd;
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unsigned char v[8];
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struct {
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@ -231,18 +369,22 @@ fix_alignment(struct pt_regs *regs)
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} data;
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/*
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* Return 1 on success
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* Return 0 if unable to handle the interrupt
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* Return -EFAULT if data address is bad
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* We require a complete register set, if not, then our assembly
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* is broken
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*/
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CHECK_FULL_REGS(regs);
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dsisr = regs->dsisr;
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/* Some processors don't provide us with a DSISR we can use here,
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* let's make one up from the instruction
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*/
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if (cpu_has_feature(CPU_FTR_NODSISRALIGN)) {
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unsigned int real_instr;
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if (__get_user(real_instr, (unsigned int __user *)regs->nip))
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return 0;
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dsisr = make_dsisr(real_instr);
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unsigned int real_instr;
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if (unlikely(__get_user(real_instr,
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(unsigned int __user *)regs->nip)))
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return -EFAULT;
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dsisr = make_dsisr(real_instr);
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}
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/* extract the operation and registers from the dsisr */
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@ -258,33 +400,37 @@ fix_alignment(struct pt_regs *regs)
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/* DAR has the operand effective address */
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addr = (unsigned char __user *)regs->dar;
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/* A size of 0 indicates an instruction we don't support */
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/* we also don't support the multiples (lmw, stmw, lmd, stmd) */
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if ((nb == 0) || (flags & M))
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return 0; /* too hard or invalid instruction */
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/*
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* Special handling for dcbz
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* dcbz may give an alignment exception for accesses to caching inhibited
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* storage
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/* A size of 0 indicates an instruction we don't support, with
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* the exception of DCBZ which is handled as a special case here
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*/
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if (instr == DCBZ)
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addr = (unsigned char __user *) ((unsigned long)addr & -L1_CACHE_BYTES);
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return emulate_dcbz(regs, addr);
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if (unlikely(nb == 0))
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return 0;
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/* Load/Store Multiple instructions are handled in their own
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* function
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*/
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if (flags & M)
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return emulate_multiple(regs, addr, reg, nb, flags, instr);
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/* Verify the address of the operand */
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if (user_mode(regs)) {
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if (!access_ok((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb))
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return -EFAULT; /* bad address */
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}
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if (unlikely(user_mode(regs) &&
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!access_ok((flags & ST ? VERIFY_WRITE : VERIFY_READ),
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addr, nb)))
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return -EFAULT;
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/* Force the fprs into the save area so we can reference them */
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if (flags & F) {
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if (!user_mode(regs))
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/* userland only */
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if (unlikely(!user_mode(regs)))
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return 0;
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flush_fp_to_thread(current);
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}
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/* If we are loading, get the data from user space */
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/* If we are loading, get the data from user space, else
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* get it from register values
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*/
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if (flags & LD) {
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data.ll = 0;
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ret = 0;
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@ -301,75 +447,62 @@ fix_alignment(struct pt_regs *regs)
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case 2:
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ret |= __get_user(data.v[6], p++);
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ret |= __get_user(data.v[7], p++);
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if (ret)
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if (unlikely(ret))
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return -EFAULT;
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}
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}
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|
||||
/* If we are storing, get the data from the saved gpr or fpr */
|
||||
if (flags & ST) {
|
||||
if (flags & F) {
|
||||
if (nb == 4) {
|
||||
/* Doing stfs, have to convert to single */
|
||||
preempt_disable();
|
||||
enable_kernel_fp();
|
||||
cvt_df(¤t->thread.fpr[reg], (float *)&data.v[4], ¤t->thread);
|
||||
disable_kernel_fp();
|
||||
preempt_enable();
|
||||
}
|
||||
else
|
||||
data.dd = current->thread.fpr[reg];
|
||||
}
|
||||
else
|
||||
data.ll = regs->gpr[reg];
|
||||
}
|
||||
|
||||
/* Swap bytes as needed */
|
||||
if (flags & SW) {
|
||||
if (nb == 2)
|
||||
SWAP(data.v[6], data.v[7]);
|
||||
else { /* nb must be 4 */
|
||||
SWAP(data.v[4], data.v[7]);
|
||||
SWAP(data.v[5], data.v[6]);
|
||||
}
|
||||
}
|
||||
|
||||
/* Sign extend as needed */
|
||||
if (flags & SE) {
|
||||
} else if (flags & F)
|
||||
data.dd = current->thread.fpr[reg];
|
||||
else
|
||||
data.ll = regs->gpr[reg];
|
||||
|
||||
/* Perform other misc operations like sign extension, byteswap,
|
||||
* or floating point single precision conversion
|
||||
*/
|
||||
switch (flags & ~U) {
|
||||
case LD+SE: /* sign extend */
|
||||
if ( nb == 2 )
|
||||
data.ll = data.x16.low16;
|
||||
else /* nb must be 4 */
|
||||
data.ll = data.x32.low32;
|
||||
}
|
||||
|
||||
/* If we are loading, move the data to the gpr or fpr */
|
||||
if (flags & LD) {
|
||||
if (flags & F) {
|
||||
if (nb == 4) {
|
||||
/* Doing lfs, have to convert to double */
|
||||
preempt_disable();
|
||||
enable_kernel_fp();
|
||||
cvt_fd((float *)&data.v[4], ¤t->thread.fpr[reg], ¤t->thread);
|
||||
disable_kernel_fp();
|
||||
preempt_enable();
|
||||
}
|
||||
else
|
||||
current->thread.fpr[reg] = data.dd;
|
||||
break;
|
||||
case LD+S: /* byte-swap */
|
||||
case ST+S:
|
||||
if (nb == 2) {
|
||||
SWAP(data.v[6], data.v[7]);
|
||||
} else {
|
||||
SWAP(data.v[4], data.v[7]);
|
||||
SWAP(data.v[5], data.v[6]);
|
||||
}
|
||||
else
|
||||
regs->gpr[reg] = data.ll;
|
||||
break;
|
||||
|
||||
/* Single-precision FP load and store require conversions... */
|
||||
case LD+F+S:
|
||||
#ifdef CONFIG_PPC_FPU
|
||||
preempt_disable();
|
||||
enable_kernel_fp();
|
||||
cvt_fd((float *)&data.v[4], &data.dd, ¤t->thread);
|
||||
preempt_enable();
|
||||
#else
|
||||
return 0;
|
||||
#endif
|
||||
break;
|
||||
case ST+F+S:
|
||||
#ifdef CONFIG_PPC_FPU
|
||||
preempt_disable();
|
||||
enable_kernel_fp();
|
||||
cvt_df(&data.dd, (float *)&data.v[4], ¤t->thread);
|
||||
preempt_enable();
|
||||
#else
|
||||
return 0;
|
||||
#endif
|
||||
break;
|
||||
}
|
||||
|
||||
/* If we are storing, copy the data to the user */
|
||||
|
||||
/* Store result to memory or update registers */
|
||||
if (flags & ST) {
|
||||
ret = 0;
|
||||
p = addr;
|
||||
switch (nb) {
|
||||
case 128: /* Special case - must be dcbz */
|
||||
lp = (unsigned long __user *)p;
|
||||
for (i = 0; i < L1_CACHE_BYTES / sizeof(long); ++i)
|
||||
ret |= __put_user(0, lp++);
|
||||
break;
|
||||
case 8:
|
||||
ret |= __put_user(data.v[0], p++);
|
||||
ret |= __put_user(data.v[1], p++);
|
||||
|
|
@ -382,15 +515,16 @@ fix_alignment(struct pt_regs *regs)
|
|||
ret |= __put_user(data.v[6], p++);
|
||||
ret |= __put_user(data.v[7], p++);
|
||||
}
|
||||
if (ret)
|
||||
if (unlikely(ret))
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
} else if (flags & F)
|
||||
current->thread.fpr[reg] = data.dd;
|
||||
else
|
||||
regs->gpr[reg] = data.ll;
|
||||
|
||||
/* Update RA as needed */
|
||||
if (flags & U) {
|
||||
if (flags & U)
|
||||
regs->gpr[areg] = regs->dar;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
|
@ -13,7 +13,7 @@ extra-$(CONFIG_POWER4) += idle_power4.o
|
|||
extra-y += vmlinux.lds
|
||||
|
||||
obj-y := entry.o traps.o idle.o time.o misc.o \
|
||||
process.o align.o \
|
||||
process.o \
|
||||
setup.o \
|
||||
ppc_htab.o
|
||||
obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o
|
||||
|
|
@ -38,7 +38,7 @@ endif
|
|||
# These are here while we do the architecture merge
|
||||
|
||||
else
|
||||
obj-y := idle.o align.o
|
||||
obj-y := idle.o
|
||||
obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o
|
||||
obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o
|
||||
obj-$(CONFIG_MODULES) += module.o
|
||||
|
|
|
|||
|
|
@ -1,410 +0,0 @@
|
|||
/*
|
||||
* align.c - handle alignment exceptions for the Power PC.
|
||||
*
|
||||
* Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
|
||||
* Copyright (c) 1998-1999 TiVo, Inc.
|
||||
* PowerPC 403GCX modifications.
|
||||
* Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
|
||||
* PowerPC 403GCX/405GP modifications.
|
||||
*/
|
||||
#include <linux/config.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mm.h>
|
||||
#include <asm/ptrace.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/system.h>
|
||||
#include <asm/cache.h>
|
||||
|
||||
struct aligninfo {
|
||||
unsigned char len;
|
||||
unsigned char flags;
|
||||
};
|
||||
|
||||
#if defined(CONFIG_4xx) || defined(CONFIG_POWER4) || defined(CONFIG_BOOKE)
|
||||
#define OPCD(inst) (((inst) & 0xFC000000) >> 26)
|
||||
#define RS(inst) (((inst) & 0x03E00000) >> 21)
|
||||
#define RA(inst) (((inst) & 0x001F0000) >> 16)
|
||||
#define IS_XFORM(code) ((code) == 31)
|
||||
#endif
|
||||
|
||||
#define INVALID { 0, 0 }
|
||||
|
||||
#define LD 1 /* load */
|
||||
#define ST 2 /* store */
|
||||
#define SE 4 /* sign-extend value */
|
||||
#define F 8 /* to/from fp regs */
|
||||
#define U 0x10 /* update index register */
|
||||
#define M 0x20 /* multiple load/store */
|
||||
#define S 0x40 /* single-precision fp, or byte-swap value */
|
||||
#define SX 0x40 /* byte count in XER */
|
||||
#define HARD 0x80 /* string, stwcx. */
|
||||
|
||||
#define DCBZ 0x5f /* 8xx/82xx dcbz faults when cache not enabled */
|
||||
|
||||
/*
|
||||
* The PowerPC stores certain bits of the instruction that caused the
|
||||
* alignment exception in the DSISR register. This array maps those
|
||||
* bits to information about the operand length and what the
|
||||
* instruction would do.
|
||||
*/
|
||||
static struct aligninfo aligninfo[128] = {
|
||||
{ 4, LD }, /* 00 0 0000: lwz / lwarx */
|
||||
INVALID, /* 00 0 0001 */
|
||||
{ 4, ST }, /* 00 0 0010: stw */
|
||||
INVALID, /* 00 0 0011 */
|
||||
{ 2, LD }, /* 00 0 0100: lhz */
|
||||
{ 2, LD+SE }, /* 00 0 0101: lha */
|
||||
{ 2, ST }, /* 00 0 0110: sth */
|
||||
{ 4, LD+M }, /* 00 0 0111: lmw */
|
||||
{ 4, LD+F+S }, /* 00 0 1000: lfs */
|
||||
{ 8, LD+F }, /* 00 0 1001: lfd */
|
||||
{ 4, ST+F+S }, /* 00 0 1010: stfs */
|
||||
{ 8, ST+F }, /* 00 0 1011: stfd */
|
||||
INVALID, /* 00 0 1100 */
|
||||
INVALID, /* 00 0 1101: ld/ldu/lwa */
|
||||
INVALID, /* 00 0 1110 */
|
||||
INVALID, /* 00 0 1111: std/stdu */
|
||||
{ 4, LD+U }, /* 00 1 0000: lwzu */
|
||||
INVALID, /* 00 1 0001 */
|
||||
{ 4, ST+U }, /* 00 1 0010: stwu */
|
||||
INVALID, /* 00 1 0011 */
|
||||
{ 2, LD+U }, /* 00 1 0100: lhzu */
|
||||
{ 2, LD+SE+U }, /* 00 1 0101: lhau */
|
||||
{ 2, ST+U }, /* 00 1 0110: sthu */
|
||||
{ 4, ST+M }, /* 00 1 0111: stmw */
|
||||
{ 4, LD+F+S+U }, /* 00 1 1000: lfsu */
|
||||
{ 8, LD+F+U }, /* 00 1 1001: lfdu */
|
||||
{ 4, ST+F+S+U }, /* 00 1 1010: stfsu */
|
||||
{ 8, ST+F+U }, /* 00 1 1011: stfdu */
|
||||
INVALID, /* 00 1 1100 */
|
||||
INVALID, /* 00 1 1101 */
|
||||
INVALID, /* 00 1 1110 */
|
||||
INVALID, /* 00 1 1111 */
|
||||
INVALID, /* 01 0 0000: ldx */
|
||||
INVALID, /* 01 0 0001 */
|
||||
INVALID, /* 01 0 0010: stdx */
|
||||
INVALID, /* 01 0 0011 */
|
||||
INVALID, /* 01 0 0100 */
|
||||
INVALID, /* 01 0 0101: lwax */
|
||||
INVALID, /* 01 0 0110 */
|
||||
INVALID, /* 01 0 0111 */
|
||||
{ 4, LD+M+HARD+SX }, /* 01 0 1000: lswx */
|
||||
{ 4, LD+M+HARD }, /* 01 0 1001: lswi */
|
||||
{ 4, ST+M+HARD+SX }, /* 01 0 1010: stswx */
|
||||
{ 4, ST+M+HARD }, /* 01 0 1011: stswi */
|
||||
INVALID, /* 01 0 1100 */
|
||||
INVALID, /* 01 0 1101 */
|
||||
INVALID, /* 01 0 1110 */
|
||||
INVALID, /* 01 0 1111 */
|
||||
INVALID, /* 01 1 0000: ldux */
|
||||
INVALID, /* 01 1 0001 */
|
||||
INVALID, /* 01 1 0010: stdux */
|
||||
INVALID, /* 01 1 0011 */
|
||||
INVALID, /* 01 1 0100 */
|
||||
INVALID, /* 01 1 0101: lwaux */
|
||||
INVALID, /* 01 1 0110 */
|
||||
INVALID, /* 01 1 0111 */
|
||||
INVALID, /* 01 1 1000 */
|
||||
INVALID, /* 01 1 1001 */
|
||||
INVALID, /* 01 1 1010 */
|
||||
INVALID, /* 01 1 1011 */
|
||||
INVALID, /* 01 1 1100 */
|
||||
INVALID, /* 01 1 1101 */
|
||||
INVALID, /* 01 1 1110 */
|
||||
INVALID, /* 01 1 1111 */
|
||||
INVALID, /* 10 0 0000 */
|
||||
INVALID, /* 10 0 0001 */
|
||||
{ 0, ST+HARD }, /* 10 0 0010: stwcx. */
|
||||
INVALID, /* 10 0 0011 */
|
||||
INVALID, /* 10 0 0100 */
|
||||
INVALID, /* 10 0 0101 */
|
||||
INVALID, /* 10 0 0110 */
|
||||
INVALID, /* 10 0 0111 */
|
||||
{ 4, LD+S }, /* 10 0 1000: lwbrx */
|
||||
INVALID, /* 10 0 1001 */
|
||||
{ 4, ST+S }, /* 10 0 1010: stwbrx */
|
||||
INVALID, /* 10 0 1011 */
|
||||
{ 2, LD+S }, /* 10 0 1100: lhbrx */
|
||||
INVALID, /* 10 0 1101 */
|
||||
{ 2, ST+S }, /* 10 0 1110: sthbrx */
|
||||
INVALID, /* 10 0 1111 */
|
||||
INVALID, /* 10 1 0000 */
|
||||
INVALID, /* 10 1 0001 */
|
||||
INVALID, /* 10 1 0010 */
|
||||
INVALID, /* 10 1 0011 */
|
||||
INVALID, /* 10 1 0100 */
|
||||
INVALID, /* 10 1 0101 */
|
||||
INVALID, /* 10 1 0110 */
|
||||
INVALID, /* 10 1 0111 */
|
||||
INVALID, /* 10 1 1000 */
|
||||
INVALID, /* 10 1 1001 */
|
||||
INVALID, /* 10 1 1010 */
|
||||
INVALID, /* 10 1 1011 */
|
||||
INVALID, /* 10 1 1100 */
|
||||
INVALID, /* 10 1 1101 */
|
||||
INVALID, /* 10 1 1110 */
|
||||
{ 0, ST+HARD }, /* 10 1 1111: dcbz */
|
||||
{ 4, LD }, /* 11 0 0000: lwzx */
|
||||
INVALID, /* 11 0 0001 */
|
||||
{ 4, ST }, /* 11 0 0010: stwx */
|
||||
INVALID, /* 11 0 0011 */
|
||||
{ 2, LD }, /* 11 0 0100: lhzx */
|
||||
{ 2, LD+SE }, /* 11 0 0101: lhax */
|
||||
{ 2, ST }, /* 11 0 0110: sthx */
|
||||
INVALID, /* 11 0 0111 */
|
||||
{ 4, LD+F+S }, /* 11 0 1000: lfsx */
|
||||
{ 8, LD+F }, /* 11 0 1001: lfdx */
|
||||
{ 4, ST+F+S }, /* 11 0 1010: stfsx */
|
||||
{ 8, ST+F }, /* 11 0 1011: stfdx */
|
||||
INVALID, /* 11 0 1100 */
|
||||
INVALID, /* 11 0 1101: lmd */
|
||||
INVALID, /* 11 0 1110 */
|
||||
INVALID, /* 11 0 1111: stmd */
|
||||
{ 4, LD+U }, /* 11 1 0000: lwzux */
|
||||
INVALID, /* 11 1 0001 */
|
||||
{ 4, ST+U }, /* 11 1 0010: stwux */
|
||||
INVALID, /* 11 1 0011 */
|
||||
{ 2, LD+U }, /* 11 1 0100: lhzux */
|
||||
{ 2, LD+SE+U }, /* 11 1 0101: lhaux */
|
||||
{ 2, ST+U }, /* 11 1 0110: sthux */
|
||||
INVALID, /* 11 1 0111 */
|
||||
{ 4, LD+F+S+U }, /* 11 1 1000: lfsux */
|
||||
{ 8, LD+F+U }, /* 11 1 1001: lfdux */
|
||||
{ 4, ST+F+S+U }, /* 11 1 1010: stfsux */
|
||||
{ 8, ST+F+U }, /* 11 1 1011: stfdux */
|
||||
INVALID, /* 11 1 1100 */
|
||||
INVALID, /* 11 1 1101 */
|
||||
INVALID, /* 11 1 1110 */
|
||||
INVALID, /* 11 1 1111 */
|
||||
};
|
||||
|
||||
#define SWAP(a, b) (t = (a), (a) = (b), (b) = t)
|
||||
|
||||
int
|
||||
fix_alignment(struct pt_regs *regs)
|
||||
{
|
||||
int instr, nb, flags;
|
||||
#if defined(CONFIG_4xx) || defined(CONFIG_POWER4) || defined(CONFIG_BOOKE)
|
||||
int opcode, f1, f2, f3;
|
||||
#endif
|
||||
int i, t;
|
||||
int reg, areg;
|
||||
int offset, nb0;
|
||||
unsigned char __user *addr;
|
||||
unsigned char *rptr;
|
||||
union {
|
||||
long l;
|
||||
float f;
|
||||
double d;
|
||||
unsigned char v[8];
|
||||
} data;
|
||||
|
||||
CHECK_FULL_REGS(regs);
|
||||
|
||||
#if defined(CONFIG_4xx) || defined(CONFIG_POWER4) || defined(CONFIG_BOOKE)
|
||||
/* The 4xx-family & Book-E processors have no DSISR register,
|
||||
* so we emulate it.
|
||||
* The POWER4 has a DSISR register but doesn't set it on
|
||||
* an alignment fault. -- paulus
|
||||
*/
|
||||
|
||||
if (__get_user(instr, (unsigned int __user *) regs->nip))
|
||||
return 0;
|
||||
opcode = OPCD(instr);
|
||||
reg = RS(instr);
|
||||
areg = RA(instr);
|
||||
|
||||
if (!IS_XFORM(opcode)) {
|
||||
f1 = 0;
|
||||
f2 = (instr & 0x04000000) >> 26;
|
||||
f3 = (instr & 0x78000000) >> 27;
|
||||
} else {
|
||||
f1 = (instr & 0x00000006) >> 1;
|
||||
f2 = (instr & 0x00000040) >> 6;
|
||||
f3 = (instr & 0x00000780) >> 7;
|
||||
}
|
||||
|
||||
instr = ((f1 << 5) | (f2 << 4) | f3);
|
||||
#else
|
||||
reg = (regs->dsisr >> 5) & 0x1f; /* source/dest register */
|
||||
areg = regs->dsisr & 0x1f; /* register to update */
|
||||
instr = (regs->dsisr >> 10) & 0x7f;
|
||||
#endif
|
||||
|
||||
nb = aligninfo[instr].len;
|
||||
if (nb == 0) {
|
||||
long __user *p;
|
||||
int i;
|
||||
|
||||
if (instr != DCBZ)
|
||||
return 0; /* too hard or invalid instruction */
|
||||
/*
|
||||
* The dcbz (data cache block zero) instruction
|
||||
* gives an alignment fault if used on non-cacheable
|
||||
* memory. We handle the fault mainly for the
|
||||
* case when we are running with the cache disabled
|
||||
* for debugging.
|
||||
*/
|
||||
p = (long __user *) (regs->dar & -L1_CACHE_BYTES);
|
||||
if (user_mode(regs)
|
||||
&& !access_ok(VERIFY_WRITE, p, L1_CACHE_BYTES))
|
||||
return -EFAULT;
|
||||
for (i = 0; i < L1_CACHE_BYTES / sizeof(long); ++i)
|
||||
if (__put_user(0, p+i))
|
||||
return -EFAULT;
|
||||
return 1;
|
||||
}
|
||||
|
||||
flags = aligninfo[instr].flags;
|
||||
if ((flags & (LD|ST)) == 0)
|
||||
return 0;
|
||||
|
||||
/* For the 4xx-family & Book-E processors, the 'dar' field of the
|
||||
* pt_regs structure is overloaded and is really from the DEAR.
|
||||
*/
|
||||
|
||||
addr = (unsigned char __user *)regs->dar;
|
||||
|
||||
if (flags & M) {
|
||||
/* lmw, stmw, lswi/x, stswi/x */
|
||||
nb0 = 0;
|
||||
if (flags & HARD) {
|
||||
if (flags & SX) {
|
||||
nb = regs->xer & 127;
|
||||
if (nb == 0)
|
||||
return 1;
|
||||
} else {
|
||||
if (__get_user(instr,
|
||||
(unsigned int __user *)regs->nip))
|
||||
return 0;
|
||||
nb = (instr >> 11) & 0x1f;
|
||||
if (nb == 0)
|
||||
nb = 32;
|
||||
}
|
||||
if (nb + reg * 4 > 128) {
|
||||
nb0 = nb + reg * 4 - 128;
|
||||
nb = 128 - reg * 4;
|
||||
}
|
||||
} else {
|
||||
/* lwm, stmw */
|
||||
nb = (32 - reg) * 4;
|
||||
}
|
||||
|
||||
if (!access_ok((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb+nb0))
|
||||
return -EFAULT; /* bad address */
|
||||
|
||||
rptr = (unsigned char *) ®s->gpr[reg];
|
||||
if (flags & LD) {
|
||||
for (i = 0; i < nb; ++i)
|
||||
if (__get_user(rptr[i], addr+i))
|
||||
return -EFAULT;
|
||||
if (nb0 > 0) {
|
||||
rptr = (unsigned char *) ®s->gpr[0];
|
||||
addr += nb;
|
||||
for (i = 0; i < nb0; ++i)
|
||||
if (__get_user(rptr[i], addr+i))
|
||||
return -EFAULT;
|
||||
}
|
||||
for (; (i & 3) != 0; ++i)
|
||||
rptr[i] = 0;
|
||||
} else {
|
||||
for (i = 0; i < nb; ++i)
|
||||
if (__put_user(rptr[i], addr+i))
|
||||
return -EFAULT;
|
||||
if (nb0 > 0) {
|
||||
rptr = (unsigned char *) ®s->gpr[0];
|
||||
addr += nb;
|
||||
for (i = 0; i < nb0; ++i)
|
||||
if (__put_user(rptr[i], addr+i))
|
||||
return -EFAULT;
|
||||
}
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
offset = 0;
|
||||
if (nb < 4) {
|
||||
/* read/write the least significant bits */
|
||||
data.l = 0;
|
||||
offset = 4 - nb;
|
||||
}
|
||||
|
||||
/* Verify the address of the operand */
|
||||
if (user_mode(regs)) {
|
||||
if (!access_ok((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb))
|
||||
return -EFAULT; /* bad address */
|
||||
}
|
||||
|
||||
if (flags & F) {
|
||||
preempt_disable();
|
||||
if (regs->msr & MSR_FP)
|
||||
giveup_fpu(current);
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
/* If we read the operand, copy it in, else get register values */
|
||||
if (flags & LD) {
|
||||
for (i = 0; i < nb; ++i)
|
||||
if (__get_user(data.v[offset+i], addr+i))
|
||||
return -EFAULT;
|
||||
} else if (flags & F) {
|
||||
data.d = current->thread.fpr[reg];
|
||||
} else {
|
||||
data.l = regs->gpr[reg];
|
||||
}
|
||||
|
||||
switch (flags & ~U) {
|
||||
case LD+SE: /* sign extend */
|
||||
if (data.v[2] >= 0x80)
|
||||
data.v[0] = data.v[1] = -1;
|
||||
break;
|
||||
|
||||
case LD+S: /* byte-swap */
|
||||
case ST+S:
|
||||
if (nb == 2) {
|
||||
SWAP(data.v[2], data.v[3]);
|
||||
} else {
|
||||
SWAP(data.v[0], data.v[3]);
|
||||
SWAP(data.v[1], data.v[2]);
|
||||
}
|
||||
break;
|
||||
|
||||
/* Single-precision FP load and store require conversions... */
|
||||
case LD+F+S:
|
||||
#ifdef CONFIG_PPC_FPU
|
||||
preempt_disable();
|
||||
enable_kernel_fp();
|
||||
cvt_fd(&data.f, &data.d, ¤t->thread);
|
||||
preempt_enable();
|
||||
#else
|
||||
return 0;
|
||||
#endif
|
||||
break;
|
||||
case ST+F+S:
|
||||
#ifdef CONFIG_PPC_FPU
|
||||
preempt_disable();
|
||||
enable_kernel_fp();
|
||||
cvt_df(&data.d, &data.f, ¤t->thread);
|
||||
preempt_enable();
|
||||
#else
|
||||
return 0;
|
||||
#endif
|
||||
break;
|
||||
}
|
||||
|
||||
if (flags & ST) {
|
||||
for (i = 0; i < nb; ++i)
|
||||
if (__put_user(data.v[offset+i], addr+i))
|
||||
return -EFAULT;
|
||||
} else if (flags & F) {
|
||||
current->thread.fpr[reg] = data.d;
|
||||
} else {
|
||||
regs->gpr[reg] = data.l;
|
||||
}
|
||||
|
||||
if (flags & U)
|
||||
regs->gpr[areg] = regs->dar;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
|
@ -2,6 +2,6 @@
|
|||
# Makefile for the linux ppc64 kernel.
|
||||
#
|
||||
|
||||
obj-y += idle.o align.o
|
||||
obj-y += idle.o
|
||||
|
||||
obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o
|
||||
|
|
|
|||
|
|
@ -90,6 +90,7 @@ extern void do_cpu_ftr_fixups(unsigned long offset);
|
|||
#define CPU_FTR_NEED_COHERENT ASM_CONST(0x0000000000020000)
|
||||
#define CPU_FTR_NO_BTIC ASM_CONST(0x0000000000040000)
|
||||
#define CPU_FTR_BIG_PHYS ASM_CONST(0x0000000000080000)
|
||||
#define CPU_FTR_NODSISRALIGN ASM_CONST(0x0000000000100000)
|
||||
|
||||
#ifdef __powerpc64__
|
||||
/* Add the 64b processor unique features in the top half of the word */
|
||||
|
|
@ -97,7 +98,6 @@ extern void do_cpu_ftr_fixups(unsigned long offset);
|
|||
#define CPU_FTR_16M_PAGE ASM_CONST(0x0000000200000000)
|
||||
#define CPU_FTR_TLBIEL ASM_CONST(0x0000000400000000)
|
||||
#define CPU_FTR_NOEXECUTE ASM_CONST(0x0000000800000000)
|
||||
#define CPU_FTR_NODSISRALIGN ASM_CONST(0x0000001000000000)
|
||||
#define CPU_FTR_IABR ASM_CONST(0x0000002000000000)
|
||||
#define CPU_FTR_MMCRA ASM_CONST(0x0000004000000000)
|
||||
#define CPU_FTR_CTRL ASM_CONST(0x0000008000000000)
|
||||
|
|
@ -113,7 +113,6 @@ extern void do_cpu_ftr_fixups(unsigned long offset);
|
|||
#define CPU_FTR_16M_PAGE ASM_CONST(0x0)
|
||||
#define CPU_FTR_TLBIEL ASM_CONST(0x0)
|
||||
#define CPU_FTR_NOEXECUTE ASM_CONST(0x0)
|
||||
#define CPU_FTR_NODSISRALIGN ASM_CONST(0x0)
|
||||
#define CPU_FTR_IABR ASM_CONST(0x0)
|
||||
#define CPU_FTR_MMCRA ASM_CONST(0x0)
|
||||
#define CPU_FTR_CTRL ASM_CONST(0x0)
|
||||
|
|
@ -273,18 +272,21 @@ enum {
|
|||
CPU_FTRS_POWER3_32 = CPU_FTR_COMMON | CPU_FTR_SPLIT_ID_CACHE |
|
||||
CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE,
|
||||
CPU_FTRS_POWER4_32 = CPU_FTR_COMMON | CPU_FTR_SPLIT_ID_CACHE |
|
||||
CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE,
|
||||
CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE | CPU_FTR_NODSISRALIGN,
|
||||
CPU_FTRS_970_32 = CPU_FTR_COMMON | CPU_FTR_SPLIT_ID_CACHE |
|
||||
CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE | CPU_FTR_ALTIVEC_COMP |
|
||||
CPU_FTR_MAYBE_CAN_NAP,
|
||||
CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_NODSISRALIGN,
|
||||
CPU_FTRS_8XX = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB,
|
||||
CPU_FTRS_40X = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB,
|
||||
CPU_FTRS_44X = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB,
|
||||
CPU_FTRS_E200 = CPU_FTR_USE_TB,
|
||||
CPU_FTRS_E500 = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB,
|
||||
CPU_FTRS_40X = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB |
|
||||
CPU_FTR_NODSISRALIGN,
|
||||
CPU_FTRS_44X = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB |
|
||||
CPU_FTR_NODSISRALIGN,
|
||||
CPU_FTRS_E200 = CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN,
|
||||
CPU_FTRS_E500 = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB |
|
||||
CPU_FTR_NODSISRALIGN,
|
||||
CPU_FTRS_E500_2 = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB |
|
||||
CPU_FTR_BIG_PHYS,
|
||||
CPU_FTRS_GENERIC_32 = CPU_FTR_COMMON,
|
||||
CPU_FTR_BIG_PHYS | CPU_FTR_NODSISRALIGN,
|
||||
CPU_FTRS_GENERIC_32 = CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN,
|
||||
#ifdef __powerpc64__
|
||||
CPU_FTRS_POWER3 = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_USE_TB |
|
||||
CPU_FTR_HPTE_TABLE | CPU_FTR_IABR,
|
||||
|
|
|
|||
Loading…
Reference in a new issue