Linux-2.6.12-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, 369 insertions, 0 deletions

diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
new file mode 100644
index 0000000..e470d28
--- /dev/null
+++ b/arch/um/sys-i386/ptrace.c
@@ -0,0 +1,369 @@
+/* 
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/config.h>
+#include <linux/compiler.h>
+#include "linux/sched.h"
+#include "asm/elf.h"
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+#include "asm/unistd.h"
+#include "sysdep/ptrace.h"
+#include "sysdep/sigcontext.h"
+#include "sysdep/sc.h"
+
+void arch_switch(void)
+{
+	update_debugregs(current->thread.arch.debugregs_seq);
+}
+
+int is_syscall(unsigned long addr)
+{
+	unsigned short instr;
+	int n;
+
+	n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
+	if(n){
+		printk("is_syscall : failed to read instruction from 0x%lx\n",
+		       addr);
+		return(0);
+	}
+	/* int 0x80 or sysenter */
+	return((instr == 0x80cd) || (instr == 0x340f));
+}
+
+/* determines which flags the user has access to. */
+/* 1 = access 0 = no access */
+#define FLAG_MASK 0x00044dd5
+
+int putreg(struct task_struct *child, int regno, unsigned long value)
+{
+	regno >>= 2;
+	switch (regno) {
+	case FS:
+		if (value && (value & 3) != 3)
+			return -EIO;
+		PT_REGS_FS(&child->thread.regs) = value;
+		return 0;
+	case GS:
+		if (value && (value & 3) != 3)
+			return -EIO;
+		PT_REGS_GS(&child->thread.regs) = value;
+		return 0;
+	case DS:
+	case ES:
+		if (value && (value & 3) != 3)
+			return -EIO;
+		value &= 0xffff;
+		break;
+	case SS:
+	case CS:
+		if ((value & 3) != 3)
+			return -EIO;
+		value &= 0xffff;
+		break;
+	case EFL:
+		value &= FLAG_MASK;
+		value |= PT_REGS_EFLAGS(&child->thread.regs);
+		break;
+	}
+	PT_REGS_SET(&child->thread.regs, regno, value);
+	return 0;
+}
+
+unsigned long getreg(struct task_struct *child, int regno)
+{
+	unsigned long retval = ~0UL;
+
+	regno >>= 2;
+	switch (regno) {
+	case FS:
+	case GS:
+	case DS:
+	case ES:
+	case SS:
+	case CS:
+		retval = 0xffff;
+		/* fall through */
+	default:
+		retval &= PT_REG(&child->thread.regs, regno);
+	}
+	return retval;
+}
+
+struct i387_fxsave_struct {
+	unsigned short	cwd;
+	unsigned short	swd;
+	unsigned short	twd;
+	unsigned short	fop;
+	long	fip;
+	long	fcs;
+	long	foo;
+	long	fos;
+	long	mxcsr;
+	long	reserved;
+	long	st_space[32];	/* 8*16 bytes for each FP-reg = 128 bytes */
+	long	xmm_space[32];	/* 8*16 bytes for each XMM-reg = 128 bytes */
+	long	padding[56];
+};
+
+/*
+ * FPU tag word conversions.
+ */
+
+static inline unsigned short twd_i387_to_fxsr( unsigned short twd )
+{
+	unsigned int tmp; /* to avoid 16 bit prefixes in the code */
+ 
+	/* Transform each pair of bits into 01 (valid) or 00 (empty) */
+        tmp = ~twd;
+        tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
+        /* and move the valid bits to the lower byte. */
+        tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
+        tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
+        tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
+        return tmp;
+}
+
+static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave )
+{
+	struct _fpxreg *st = NULL;
+	unsigned long twd = (unsigned long) fxsave->twd;
+	unsigned long tag;
+	unsigned long ret = 0xffff0000;
+	int i;
+
+#define FPREG_ADDR(f, n)	((char *)&(f)->st_space + (n) * 16);
+
+	for ( i = 0 ; i < 8 ; i++ ) {
+		if ( twd & 0x1 ) {
+			st = (struct _fpxreg *) FPREG_ADDR( fxsave, i );
+
+			switch ( st->exponent & 0x7fff ) {
+			case 0x7fff:
+				tag = 2;		/* Special */
+				break;
+			case 0x0000:
+				if ( !st->significand[0] &&
+				     !st->significand[1] &&
+				     !st->significand[2] &&
+				     !st->significand[3] ) {
+					tag = 1;	/* Zero */
+				} else {
+					tag = 2;	/* Special */
+				}
+				break;
+			default:
+				if ( st->significand[3] & 0x8000 ) {
+					tag = 0;	/* Valid */
+				} else {
+					tag = 2;	/* Special */
+				}
+				break;
+			}
+		} else {
+			tag = 3;			/* Empty */
+		}
+		ret |= (tag << (2 * i));
+		twd = twd >> 1;
+	}
+	return ret;
+}
+
+/*
+ * FXSR floating point environment conversions.
+ */
+
+#ifdef CONFIG_MODE_TT
+static inline int convert_fxsr_to_user_tt(struct _fpstate __user *buf,
+					  struct pt_regs *regs)
+{
+	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
+	unsigned long env[7];
+	struct _fpreg __user *to;
+	struct _fpxreg *from;
+	int i;
+
+	env[0] = (unsigned long)fxsave->cwd | 0xffff0000;
+	env[1] = (unsigned long)fxsave->swd | 0xffff0000;
+	env[2] = twd_fxsr_to_i387(fxsave);
+	env[3] = fxsave->fip;
+	env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
+	env[5] = fxsave->foo;
+	env[6] = fxsave->fos;
+
+	if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
+		return 1;
+
+	to = &buf->_st[0];
+	from = (struct _fpxreg *) &fxsave->st_space[0];
+	for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
+		if ( __copy_to_user( to, from, sizeof(*to) ) )
+			return 1;
+	}
+	return 0;
+}
+#endif
+
+static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
+				       struct pt_regs *regs)
+{
+	return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
+}
+
+#ifdef CONFIG_MODE_TT
+static inline int convert_fxsr_from_user_tt(struct pt_regs *regs,
+					    struct _fpstate __user *buf)
+{
+	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
+	unsigned long env[7];
+	struct _fpxreg *to;
+	struct _fpreg __user *from;
+	int i;
+
+	if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
+		return 1;
+
+	fxsave->cwd = (unsigned short)(env[0] & 0xffff);
+	fxsave->swd = (unsigned short)(env[1] & 0xffff);
+	fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
+	fxsave->fip = env[3];
+	fxsave->fop = (unsigned short)((env[4] & 0xffff0000) >> 16);
+	fxsave->fcs = (env[4] & 0xffff);
+	fxsave->foo = env[5];
+	fxsave->fos = env[6];
+
+	to = (struct _fpxreg *) &fxsave->st_space[0];
+	from = &buf->_st[0];
+	for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
+		if ( __copy_from_user( to, from, sizeof(*from) ) )
+			return 1;
+	}
+	return 0;
+}
+#endif
+
+static inline int convert_fxsr_from_user(struct pt_regs *regs, 
+					 struct _fpstate __user *buf)
+{
+	return(CHOOSE_MODE(convert_fxsr_from_user_tt(regs, buf), 0));
+}
+
+int get_fpregs(unsigned long buf, struct task_struct *child)
+{
+	int err;
+
+	err = convert_fxsr_to_user((struct _fpstate __user *) buf,
+				   &child->thread.regs);
+	if(err) return(-EFAULT);
+	else return(0);
+}
+
+int set_fpregs(unsigned long buf, struct task_struct *child)
+{
+	int err;
+
+	err = convert_fxsr_from_user(&child->thread.regs, 
+				     (struct _fpstate __user *) buf);
+	if(err) return(-EFAULT);
+	else return(0);
+}
+
+#ifdef CONFIG_MODE_TT
+int get_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
+{
+	struct pt_regs *regs = &tsk->thread.regs;
+	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
+	int err;
+
+	err = __copy_to_user((void __user *) buf, fxsave,
+			     sizeof(struct user_fxsr_struct));
+	if(err) return -EFAULT;
+	else return 0;
+}
+#endif
+
+int get_fpxregs(unsigned long buf, struct task_struct *tsk)
+{
+	return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
+}
+
+#ifdef CONFIG_MODE_TT
+int set_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
+{
+	struct pt_regs *regs = &tsk->thread.regs;
+	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
+	int err;
+
+	err = __copy_from_user(fxsave, (void __user *) buf,
+			       sizeof(struct user_fxsr_struct) );
+	if(err) return -EFAULT;
+	else return 0;
+}
+#endif
+
+int set_fpxregs(unsigned long buf, struct task_struct *tsk)
+{
+	return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
+}
+
+#ifdef notdef
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
+{
+	fpu->cwd = (((SC_FP_CW(PT_REGS_SC(regs)) & 0xffff) << 16) |
+		    (SC_FP_SW(PT_REGS_SC(regs)) & 0xffff));
+	fpu->swd = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
+	fpu->twd = SC_FP_IPOFF(PT_REGS_SC(regs));
+	fpu->fip = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
+	fpu->fcs = SC_FP_DATAOFF(PT_REGS_SC(regs));
+	fpu->foo = SC_FP_DATASEL(PT_REGS_SC(regs));
+	fpu->fos = 0;
+	memcpy(fpu->st_space, (void *) SC_FP_ST(PT_REGS_SC(regs)),
+	       sizeof(fpu->st_space));
+	return(1);
+}
+#endif
+
+#ifdef CONFIG_MODE_TT
+static inline void copy_fpu_fxsave_tt(struct pt_regs *regs,
+				      struct user_i387_struct *buf)
+{
+	struct i387_fxsave_struct *fpu = SC_FXSR_ENV(PT_REGS_SC(regs));
+	unsigned short *to;
+	unsigned short *from;
+	int i;
+
+	memcpy( buf, fpu, 7 * sizeof(long) );
+
+	to = (unsigned short *) &buf->st_space[0];
+	from = (unsigned short *) &fpu->st_space[0];
+	for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
+		memcpy( to, from, 5 * sizeof(unsigned short) );
+	}
+}
+#endif
+
+static inline void copy_fpu_fxsave(struct pt_regs *regs,
+				   struct user_i387_struct *buf)
+{
+	(void) CHOOSE_MODE(copy_fpu_fxsave_tt(regs, buf), 0);
+}
+
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
+{
+	copy_fpu_fxsave(regs, (struct user_i387_struct *) fpu);
+	return(1);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */