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, 147 insertions, 0 deletions

diff --git a/arch/ppc/kernel/softemu8xx.c b/arch/ppc/kernel/softemu8xx.c
new file mode 100644
index 000000000000..9bbb6bf7b645
--- /dev/null
+++ b/arch/ppc/kernel/softemu8xx.c
@@ -0,0 +1,147 @@
+/*
+ * Software emulation of some PPC instructions for the 8xx core.
+ *
+ * Copyright (C) 1998 Dan Malek (dmalek@jlc.net)
+ *
+ * Software floating emuation for the MPC8xx processor.  I did this mostly
+ * because it was easier than trying to get the libraries compiled for
+ * software floating point.  The goal is still to get the libraries done,
+ * but I lost patience and needed some hacks to at least get init and
+ * shells running.  The first problem is the setjmp/longjmp that save
+ * and restore the floating point registers.
+ *
+ * For this emulation, our working registers are found on the register
+ * save area.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/interrupt.h>
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+
+extern void
+print_8xx_pte(struct mm_struct *mm, unsigned long addr);
+extern int
+get_8xx_pte(struct mm_struct *mm, unsigned long addr);
+
+/* Eventually we may need a look-up table, but this works for now.
+*/
+#define LFS	48
+#define LFD	50
+#define LFDU	51
+#define STFD	54
+#define STFDU	55
+#define FMR	63
+
+/*
+ * We return 0 on success, 1 on unimplemented instruction, and EFAULT
+ * if a load/store faulted.
+ */
+int
+Soft_emulate_8xx(struct pt_regs *regs)
+{
+	uint	inst, instword;
+	uint	flreg, idxreg, disp;
+	uint	retval;
+	signed short sdisp;
+	uint	*ea, *ip;
+
+	retval = 0;
+
+	instword = *((uint *)regs->nip);
+	inst = instword >> 26;
+
+	flreg = (instword >> 21) & 0x1f;
+	idxreg = (instword >> 16) & 0x1f;
+	disp = instword & 0xffff;
+
+	ea = (uint *)(regs->gpr[idxreg] + disp);
+	ip = (uint *)&current->thread.fpr[flreg];
+
+	switch ( inst )
+	{
+	case LFD:
+		/* this is a 16 bit quantity that is sign extended
+		 * so use a signed short here -- Cort
+		 */
+		sdisp = (instword & 0xffff);
+		ea = (uint *)(regs->gpr[idxreg] + sdisp);
+		if (copy_from_user(ip, ea, sizeof(double)))
+			retval = -EFAULT;
+		break;
+		
+	case LFDU:
+		if (copy_from_user(ip, ea, sizeof(double)))
+			retval = -EFAULT;
+		else
+			regs->gpr[idxreg] = (uint)ea;
+		break;
+	case LFS:
+		sdisp = (instword & 0xffff);
+		ea = (uint *)(regs->gpr[idxreg] + sdisp);
+		if (copy_from_user(ip, ea, sizeof(float)))
+			retval = -EFAULT;
+		break;
+	case STFD:
+		/* this is a 16 bit quantity that is sign extended
+		 * so use a signed short here -- Cort
+		 */
+		sdisp = (instword & 0xffff);
+		ea = (uint *)(regs->gpr[idxreg] + sdisp);
+		if (copy_to_user(ea, ip, sizeof(double)))
+			retval = -EFAULT;
+		break;
+
+	case STFDU:
+		if (copy_to_user(ea, ip, sizeof(double)))
+			retval = -EFAULT;
+		else
+			regs->gpr[idxreg] = (uint)ea;
+		break;
+	case FMR:
+		/* assume this is a fp move -- Cort */
+		memcpy( ip, &current->thread.fpr[(instword>>11)&0x1f],
+			sizeof(double) );
+		break;
+	default:
+		retval = 1;
+		printk("Bad emulation %s/%d\n"
+		       " NIP: %08lx instruction: %08x opcode: %x "
+		       "A: %x B: %x C: %x code: %x rc: %x\n",
+		       current->comm,current->pid,
+		       regs->nip,
+		       instword,inst,
+		       (instword>>16)&0x1f,
+		       (instword>>11)&0x1f,
+		       (instword>>6)&0x1f,
+		       (instword>>1)&0x3ff,
+		       instword&1);
+		{
+			int pa;
+			print_8xx_pte(current->mm,regs->nip);
+			pa = get_8xx_pte(current->mm,regs->nip) & PAGE_MASK;
+			pa |= (regs->nip & ~PAGE_MASK);
+			pa = (unsigned long)__va(pa);
+			printk("Kernel VA for NIP %x ", pa);
+			print_8xx_pte(current->mm,pa);
+		}
+		
+	}
+
+	if (retval == 0)
+		regs->nip += 4;
+	return(retval);
+}
+