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-rw-r--r--arch/um/sys-i386/ptrace.c369
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 00000000000..e470d28cdf8
--- /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:
+ */
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