Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 218 insertions, 0 deletions

diff --git a/arch/frv/mm/unaligned.c b/arch/frv/mm/unaligned.c
new file mode 100644
index 000000000000..09b361443fc2
--- /dev/null
+++ b/arch/frv/mm/unaligned.c
@@ -0,0 +1,218 @@
+/* unaligned.c: unalignment fixup handler for CPUs on which it is supported (FR451 only)
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.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 <linux/config.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+#include <linux/user.h>
+#include <linux/string.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+#include <asm/setup.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#if 0
+#define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
+#else
+#define kdebug(fmt, ...) do {} while(0)
+#endif
+
+#define _MA_SIGNED      0x01
+#define _MA_HALF        0x02
+#define _MA_WORD        0x04
+#define _MA_DWORD       0x08
+#define _MA_SZ_MASK     0x0e
+#define _MA_LOAD        0x10
+#define _MA_STORE       0x20
+#define _MA_UPDATE      0x40
+#define _MA_IMM         0x80
+
+#define _MA_LDxU        _MA_LOAD | _MA_UPDATE
+#define _MA_LDxI        _MA_LOAD | _MA_IMM
+#define _MA_STxU        _MA_STORE | _MA_UPDATE
+#define _MA_STxI        _MA_STORE | _MA_IMM
+
+static const uint8_t tbl_LDGRk_reg[0x40] = {
+        [0x02] = _MA_LOAD | _MA_HALF | _MA_SIGNED,      /* LDSH  @(GRi,GRj),GRk */
+        [0x03] = _MA_LOAD | _MA_HALF,                   /* LDUH  @(GRi,GRj),GRk */
+        [0x04] = _MA_LOAD | _MA_WORD,                   /* LD    @(GRi,GRj),GRk */
+        [0x05] = _MA_LOAD | _MA_DWORD,                  /* LDD   @(GRi,GRj),GRk */
+        [0x12] = _MA_LDxU | _MA_HALF | _MA_SIGNED,      /* LDSHU @(GRi,GRj),GRk */
+        [0x13] = _MA_LDxU | _MA_HALF,                   /* LDUHU @(GRi,GRj),GRk */
+        [0x14] = _MA_LDxU | _MA_WORD,                   /* LDU   @(GRi,GRj),GRk */
+        [0x15] = _MA_LDxU | _MA_DWORD,                  /* LDDU  @(GRi,GRj),GRk */
+};
+
+static const uint8_t tbl_STGRk_reg[0x40] = {
+        [0x01] = _MA_STORE | _MA_HALF,                  /* STH   @(GRi,GRj),GRk */
+        [0x02] = _MA_STORE | _MA_WORD,                  /* ST    @(GRi,GRj),GRk */
+        [0x03] = _MA_STORE | _MA_DWORD,                 /* STD   @(GRi,GRj),GRk */
+        [0x11] = _MA_STxU  | _MA_HALF,                  /* STHU  @(GRi,GRj),GRk */
+        [0x12] = _MA_STxU  | _MA_WORD,                  /* STU   @(GRi,GRj),GRk */
+        [0x13] = _MA_STxU  | _MA_DWORD,                 /* STDU  @(GRi,GRj),GRk */
+};
+
+static const uint8_t tbl_LDSTGRk_imm[0x80] = {
+        [0x31] = _MA_LDxI | _MA_HALF | _MA_SIGNED,      /* LDSHI @(GRi,d12),GRk */
+        [0x32] = _MA_LDxI | _MA_WORD,                   /* LDI   @(GRi,d12),GRk */
+        [0x33] = _MA_LDxI | _MA_DWORD,                  /* LDDI  @(GRi,d12),GRk */
+        [0x36] = _MA_LDxI | _MA_HALF,                   /* LDUHI @(GRi,d12),GRk */
+        [0x51] = _MA_STxI | _MA_HALF,                   /* STHI  @(GRi,d12),GRk */
+        [0x52] = _MA_STxI | _MA_WORD,                   /* STI   @(GRi,d12),GRk */
+        [0x53] = _MA_STxI | _MA_DWORD,                  /* STDI  @(GRi,d12),GRk */
+};
+
+
+/*****************************************************************************/
+/*
+ * see if we can handle the exception by fixing up a misaligned memory access
+ */
+int handle_misalignment(unsigned long esr0, unsigned long ear0, unsigned long epcr0)
+{
+        unsigned long insn, addr, *greg;
+        int GRi, GRj, GRk, D12, op;
+
+        union {
+                uint64_t _64;
+                uint32_t _32[2];
+                uint16_t _16;
+                uint8_t _8[8];
+        } x;
+
+        if (!(esr0 & ESR0_EAV) || !(epcr0 & EPCR0_V) || !(ear0 & 7))
+                return -EAGAIN;
+
+        epcr0 &= EPCR0_PC;
+
+        if (__frame->pc != epcr0) {
+                kdebug("MISALIGN: Execution not halted on excepting instruction\n");
+                BUG();
+        }
+
+        if (__get_user(insn, (unsigned long *) epcr0) < 0)
+                return -EFAULT;
+
+        /* determine the instruction type first */
+        switch ((insn >> 18) & 0x7f) {
+        case 0x2:
+                /* LDx @(GRi,GRj),GRk */
+                op = tbl_LDGRk_reg[(insn >> 6) & 0x3f];
+                break;
+
+        case 0x3:
+                /* STx GRk,@(GRi,GRj) */
+                op = tbl_STGRk_reg[(insn >> 6) & 0x3f];
+                break;
+
+        default:
+                op = tbl_LDSTGRk_imm[(insn >> 18) & 0x7f];
+                break;
+        }
+
+        if (!op)
+                return -EAGAIN;
+
+        kdebug("MISALIGN: pc=%08lx insn=%08lx ad=%08lx op=%02x\n", epcr0, insn, ear0, op);
+
+        memset(&x, 0xba, 8);
+
+        /* validate the instruction parameters */
+        greg = (unsigned long *) &__frame->tbr;
+
+        GRi = (insn >> 12) & 0x3f;
+        GRk = (insn >> 25) & 0x3f;
+
+        if (GRi > 31 || GRk > 31)
+                return -ENOENT;
+
+        if (op & _MA_DWORD && GRk & 1)
+                return -EINVAL;
+
+        if (op & _MA_IMM) {
+                D12 = insn & 0xfff;
+                asm ("slli %0,#20,%0 ! srai %0,#20,%0" : "=r"(D12) : "0"(D12)); /* sign extend */
+                addr = (GRi ? greg[GRi] : 0) + D12;
+        }
+        else {
+                GRj = (insn >>  0) & 0x3f;
+                if (GRj > 31)
+                        return -ENOENT;
+                addr = (GRi ? greg[GRi] : 0) + (GRj ? greg[GRj] : 0);
+        }
+
+        if (addr != ear0) {
+                kdebug("MISALIGN: Calculated addr (%08lx) does not match EAR0 (%08lx)\n",
+                       addr, ear0);
+                return -EFAULT;
+        }
+
+        /* check the address is okay */
+        if (user_mode(__frame) && ___range_ok(ear0, 8) < 0)
+                return -EFAULT;
+
+        /* perform the memory op */
+        if (op & _MA_STORE) {
+                /* perform a store */
+                x._32[0] = 0;
+                if (GRk != 0) {
+                        if (op & _MA_HALF) {
+                                x._16 = greg[GRk];
+                        }
+                        else {
+                                x._32[0] = greg[GRk];
+                        }
+                }
+                if (op & _MA_DWORD)
+                        x._32[1] = greg[GRk + 1];
+
+                kdebug("MISALIGN: Store GR%d { %08x:%08x } -> %08lx (%dB)\n",
+                       GRk, x._32[1], x._32[0], addr, op & _MA_SZ_MASK);
+
+                if (__memcpy_user((void *) addr, &x, op & _MA_SZ_MASK) != 0)
+                        return -EFAULT;
+        }
+        else {
+                /* perform a load */
+                if (__memcpy_user(&x, (void *) addr, op & _MA_SZ_MASK) != 0)
+                        return -EFAULT;
+
+                if (op & _MA_HALF) {
+                        if (op & _MA_SIGNED)
+                                asm ("slli %0,#16,%0 ! srai %0,#16,%0"
+                                     : "=r"(x._32[0]) : "0"(x._16));
+                        else
+                                asm ("sethi #0,%0"
+                                     : "=r"(x._32[0]) : "0"(x._16));
+                }
+
+                kdebug("MISALIGN: Load %08lx (%dB) -> GR%d, { %08x:%08x }\n",
+                       addr, op & _MA_SZ_MASK, GRk, x._32[1], x._32[0]);
+
+                if (GRk != 0)
+                        greg[GRk] = x._32[0];
+                if (op & _MA_DWORD)
+                        greg[GRk + 1] = x._32[1];
+        }
+
+        /* update the base pointer if required */
+        if (op & _MA_UPDATE)
+                greg[GRi] = addr;
+
+        /* well... we've done that insn */
+        __frame->pc = __frame->pc + 4;
+
+        return 0;
+} /* end handle_misalignment() */