diff options
Diffstat (limited to 'arch/um/sys-i386/ptrace.c')
| -rw-r--r-- | arch/um/sys-i386/ptrace.c | 369 |
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 000000000000..e470d28cdf84 --- /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: + */ |