aboutsummaryrefslogtreecommitdiff
path: root/arch/ppc64/kernel/align.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/ppc64/kernel/align.c')
-rw-r--r--arch/ppc64/kernel/align.c396
1 files changed, 0 insertions, 396 deletions
diff --git a/arch/ppc64/kernel/align.c b/arch/ppc64/kernel/align.c
deleted file mode 100644
index 330e7ef8142..00000000000
--- a/arch/ppc64/kernel/align.c
+++ /dev/null
@@ -1,396 +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.
- * Copyright (c) 2001-2002 PPC64 team, IBM Corp
- * 64-bit and Power4 support
- *
- * 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 <linux/kernel.h>
-#include <linux/mm.h>
-#include <asm/processor.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/cache.h>
-#include <asm/cputable.h>
-
-struct aligninfo {
- unsigned char len;
- unsigned char flags;
-};
-
-#define IS_XFORM(inst) (((inst) >> 26) == 31)
-#define IS_DSFORM(inst) (((inst) >> 26) >= 56)
-
-#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 SW 0x40 /* byte swap */
-
-#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 }, /* 00 0 1000: lfs */
- { 8, LD+F }, /* 00 0 1001: lfd */
- { 4, ST+F }, /* 00 0 1010: stfs */
- { 8, ST+F }, /* 00 0 1011: stfd */
- INVALID, /* 00 0 1100 */
- { 8, LD }, /* 00 0 1101: ld */
- INVALID, /* 00 0 1110 */
- { 8, ST }, /* 00 0 1111: std */
- { 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+U }, /* 00 1 1000: lfsu */
- { 8, LD+F+U }, /* 00 1 1001: lfdu */
- { 4, ST+F+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 */
- { 8, LD }, /* 01 0 0000: ldx */
- INVALID, /* 01 0 0001 */
- { 8, ST }, /* 01 0 0010: stdx */
- INVALID, /* 01 0 0011 */
- INVALID, /* 01 0 0100 */
- { 4, LD+SE }, /* 01 0 0101: lwax */
- INVALID, /* 01 0 0110 */
- INVALID, /* 01 0 0111 */
- { 0, LD }, /* 01 0 1000: lswx */
- { 0, LD }, /* 01 0 1001: lswi */
- { 0, ST }, /* 01 0 1010: stswx */
- { 0, ST }, /* 01 0 1011: stswi */
- INVALID, /* 01 0 1100 */
- { 8, LD+U }, /* 01 0 1101: ldu */
- INVALID, /* 01 0 1110 */
- { 8, ST+U }, /* 01 0 1111: stdu */
- { 8, LD+U }, /* 01 1 0000: ldux */
- INVALID, /* 01 1 0001 */
- { 8, ST+U }, /* 01 1 0010: stdux */
- INVALID, /* 01 1 0011 */
- INVALID, /* 01 1 0100 */
- { 4, LD+SE+U }, /* 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 }, /* 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+SW }, /* 10 0 1000: lwbrx */
- INVALID, /* 10 0 1001 */
- { 4, ST+SW }, /* 10 0 1010: stwbrx */
- INVALID, /* 10 0 1011 */
- { 2, LD+SW }, /* 10 0 1100: lhbrx */
- { 4, LD+SE }, /* 10 0 1101 lwa */
- { 2, ST+SW }, /* 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 */
- { L1_CACHE_BYTES, ST }, /* 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 }, /* 11 0 1000: lfsx */
- { 8, LD+F }, /* 11 0 1001: lfdx */
- { 4, ST+F }, /* 11 0 1010: stfsx */
- { 8, ST+F }, /* 11 0 1011: stfdx */
- INVALID, /* 11 0 1100 */
- { 8, LD+M }, /* 11 0 1101: lmd */
- INVALID, /* 11 0 1110 */
- { 8, ST+M }, /* 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+U }, /* 11 1 1000: lfsux */
- { 8, LD+F+U }, /* 11 1 1001: lfdux */
- { 4, ST+F+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)
-
-static inline unsigned make_dsisr(unsigned instr)
-{
- unsigned dsisr;
-
- /* create a DSISR value from the instruction */
- dsisr = (instr & 0x03ff0000) >> 16; /* bits 6:15 --> 22:31 */
-
- if ( IS_XFORM(instr) ) {
- dsisr |= (instr & 0x00000006) << 14; /* bits 29:30 --> 15:16 */
- dsisr |= (instr & 0x00000040) << 8; /* bit 25 --> 17 */
- dsisr |= (instr & 0x00000780) << 3; /* bits 21:24 --> 18:21 */
- }
- else {
- dsisr |= (instr & 0x04000000) >> 12; /* bit 5 --> 17 */
- dsisr |= (instr & 0x78000000) >> 17; /* bits 1: 4 --> 18:21 */
- if ( IS_DSFORM(instr) ) {
- dsisr |= (instr & 0x00000003) << 18; /* bits 30:31 --> 12:13 */
- }
- }
-
- return dsisr;
-}
-
-int
-fix_alignment(struct pt_regs *regs)
-{
- unsigned int instr, nb, flags;
- int t;
- unsigned long reg, areg;
- unsigned long i;
- int ret;
- unsigned dsisr;
- unsigned char __user *addr;
- unsigned char __user *p;
- unsigned long __user *lp;
- union {
- long ll;
- double dd;
- unsigned char v[8];
- struct {
- unsigned hi32;
- int low32;
- } x32;
- struct {
- unsigned char hi48[6];
- short low16;
- } x16;
- } data;
-
- /*
- * Return 1 on success
- * Return 0 if unable to handle the interrupt
- * Return -EFAULT if data address is bad
- */
-
- dsisr = regs->dsisr;
-
- if (cpu_has_feature(CPU_FTR_NODSISRALIGN)) {
- unsigned int real_instr;
- if (__get_user(real_instr, (unsigned int __user *)regs->nip))
- return 0;
- dsisr = make_dsisr(real_instr);
- }
-
- /* extract the operation and registers from the dsisr */
- reg = (dsisr >> 5) & 0x1f; /* source/dest register */
- areg = dsisr & 0x1f; /* register to update */
- instr = (dsisr >> 10) & 0x7f;
- instr |= (dsisr >> 13) & 0x60;
-
- /* Lookup the operation in our table */
- nb = aligninfo[instr].len;
- flags = aligninfo[instr].flags;
-
- /* DAR has the operand effective address */
- addr = (unsigned char __user *)regs->dar;
-
- /* A size of 0 indicates an instruction we don't support */
- /* we also don't support the multiples (lmw, stmw, lmd, stmd) */
- if ((nb == 0) || (flags & M))
- return 0; /* too hard or invalid instruction */
-
- /*
- * Special handling for dcbz
- * dcbz may give an alignment exception for accesses to caching inhibited
- * storage
- */
- if (instr == DCBZ)
- addr = (unsigned char __user *) ((unsigned long)addr & -L1_CACHE_BYTES);
-
- /* 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 */
- }
-
- /* Force the fprs into the save area so we can reference them */
- if (flags & F) {
- if (!user_mode(regs))
- return 0;
- flush_fp_to_thread(current);
- }
-
- /* If we are loading, get the data from user space */
- if (flags & LD) {
- data.ll = 0;
- ret = 0;
- p = addr;
- switch (nb) {
- case 8:
- ret |= __get_user(data.v[0], p++);
- ret |= __get_user(data.v[1], p++);
- ret |= __get_user(data.v[2], p++);
- ret |= __get_user(data.v[3], p++);
- case 4:
- ret |= __get_user(data.v[4], p++);
- ret |= __get_user(data.v[5], p++);
- case 2:
- ret |= __get_user(data.v[6], p++);
- ret |= __get_user(data.v[7], p++);
- if (ret)
- return -EFAULT;
- }
- }
-
- /* 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(&current->thread.fpr[reg], (float *)&data.v[4], &current->thread.fpscr);
- 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) {
- 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], &current->thread.fpr[reg], &current->thread.fpscr);
- disable_kernel_fp();
- preempt_enable();
- }
- else
- current->thread.fpr[reg] = data.dd;
- }
- else
- regs->gpr[reg] = data.ll;
- }
-
- /* If we are storing, copy the data to the user */
- 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++);
- ret |= __put_user(data.v[2], p++);
- ret |= __put_user(data.v[3], p++);
- case 4:
- ret |= __put_user(data.v[4], p++);
- ret |= __put_user(data.v[5], p++);
- case 2:
- ret |= __put_user(data.v[6], p++);
- ret |= __put_user(data.v[7], p++);
- }
- if (ret)
- return -EFAULT;
- }
-
- /* Update RA as needed */
- if (flags & U) {
- regs->gpr[areg] = regs->dar;
- }
-
- return 1;
-}
-
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-15 23:20:02 +0000