![Linus Torvalds](/assets/img/avatar_default.png)
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!
271 lines
9 KiB
C
271 lines
9 KiB
C
/*---------------------------------------------------------------------------+
|
|
| load_store.c |
|
|
| |
|
|
| This file contains most of the code to interpret the FPU instructions |
|
|
| which load and store from user memory. |
|
|
| |
|
|
| Copyright (C) 1992,1993,1994,1997 |
|
|
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
|
|
| Australia. E-mail billm@suburbia.net |
|
|
| |
|
|
| |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
/*---------------------------------------------------------------------------+
|
|
| Note: |
|
|
| The file contains code which accesses user memory. |
|
|
| Emulator static data may change when user memory is accessed, due to |
|
|
| other processes using the emulator while swapping is in progress. |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "fpu_system.h"
|
|
#include "exception.h"
|
|
#include "fpu_emu.h"
|
|
#include "status_w.h"
|
|
#include "control_w.h"
|
|
|
|
|
|
#define _NONE_ 0 /* st0_ptr etc not needed */
|
|
#define _REG0_ 1 /* Will be storing st(0) */
|
|
#define _PUSH_ 3 /* Need to check for space to push onto stack */
|
|
#define _null_ 4 /* Function illegal or not implemented */
|
|
|
|
#define pop_0() { FPU_settag0(TAG_Empty); top++; }
|
|
|
|
|
|
static u_char const type_table[32] = {
|
|
_PUSH_, _PUSH_, _PUSH_, _PUSH_,
|
|
_null_, _null_, _null_, _null_,
|
|
_REG0_, _REG0_, _REG0_, _REG0_,
|
|
_REG0_, _REG0_, _REG0_, _REG0_,
|
|
_NONE_, _null_, _NONE_, _PUSH_,
|
|
_NONE_, _PUSH_, _null_, _PUSH_,
|
|
_NONE_, _null_, _NONE_, _REG0_,
|
|
_NONE_, _REG0_, _NONE_, _REG0_
|
|
};
|
|
|
|
u_char const data_sizes_16[32] = {
|
|
4, 4, 8, 2, 0, 0, 0, 0,
|
|
4, 4, 8, 2, 4, 4, 8, 2,
|
|
14, 0, 94, 10, 2, 10, 0, 8,
|
|
14, 0, 94, 10, 2, 10, 2, 8
|
|
};
|
|
|
|
static u_char const data_sizes_32[32] = {
|
|
4, 4, 8, 2, 0, 0, 0, 0,
|
|
4, 4, 8, 2, 4, 4, 8, 2,
|
|
28, 0,108, 10, 2, 10, 0, 8,
|
|
28, 0,108, 10, 2, 10, 2, 8
|
|
};
|
|
|
|
int FPU_load_store(u_char type, fpu_addr_modes addr_modes,
|
|
void __user *data_address)
|
|
{
|
|
FPU_REG loaded_data;
|
|
FPU_REG *st0_ptr;
|
|
u_char st0_tag = TAG_Empty; /* This is just to stop a gcc warning. */
|
|
u_char loaded_tag;
|
|
|
|
st0_ptr = NULL; /* Initialized just to stop compiler warnings. */
|
|
|
|
if ( addr_modes.default_mode & PROTECTED )
|
|
{
|
|
if ( addr_modes.default_mode == SEG32 )
|
|
{
|
|
if ( access_limit < data_sizes_32[type] )
|
|
math_abort(FPU_info,SIGSEGV);
|
|
}
|
|
else if ( addr_modes.default_mode == PM16 )
|
|
{
|
|
if ( access_limit < data_sizes_16[type] )
|
|
math_abort(FPU_info,SIGSEGV);
|
|
}
|
|
#ifdef PARANOID
|
|
else
|
|
EXCEPTION(EX_INTERNAL|0x140);
|
|
#endif /* PARANOID */
|
|
}
|
|
|
|
switch ( type_table[type] )
|
|
{
|
|
case _NONE_:
|
|
break;
|
|
case _REG0_:
|
|
st0_ptr = &st(0); /* Some of these instructions pop after
|
|
storing */
|
|
st0_tag = FPU_gettag0();
|
|
break;
|
|
case _PUSH_:
|
|
{
|
|
if ( FPU_gettagi(-1) != TAG_Empty )
|
|
{ FPU_stack_overflow(); return 0; }
|
|
top--;
|
|
st0_ptr = &st(0);
|
|
}
|
|
break;
|
|
case _null_:
|
|
FPU_illegal();
|
|
return 0;
|
|
#ifdef PARANOID
|
|
default:
|
|
EXCEPTION(EX_INTERNAL|0x141);
|
|
return 0;
|
|
#endif /* PARANOID */
|
|
}
|
|
|
|
switch ( type )
|
|
{
|
|
case 000: /* fld m32real */
|
|
clear_C1();
|
|
loaded_tag = FPU_load_single((float __user *)data_address, &loaded_data);
|
|
if ( (loaded_tag == TAG_Special)
|
|
&& isNaN(&loaded_data)
|
|
&& (real_1op_NaN(&loaded_data) < 0) )
|
|
{
|
|
top++;
|
|
break;
|
|
}
|
|
FPU_copy_to_reg0(&loaded_data, loaded_tag);
|
|
break;
|
|
case 001: /* fild m32int */
|
|
clear_C1();
|
|
loaded_tag = FPU_load_int32((long __user *)data_address, &loaded_data);
|
|
FPU_copy_to_reg0(&loaded_data, loaded_tag);
|
|
break;
|
|
case 002: /* fld m64real */
|
|
clear_C1();
|
|
loaded_tag = FPU_load_double((double __user *)data_address, &loaded_data);
|
|
if ( (loaded_tag == TAG_Special)
|
|
&& isNaN(&loaded_data)
|
|
&& (real_1op_NaN(&loaded_data) < 0) )
|
|
{
|
|
top++;
|
|
break;
|
|
}
|
|
FPU_copy_to_reg0(&loaded_data, loaded_tag);
|
|
break;
|
|
case 003: /* fild m16int */
|
|
clear_C1();
|
|
loaded_tag = FPU_load_int16((short __user *)data_address, &loaded_data);
|
|
FPU_copy_to_reg0(&loaded_data, loaded_tag);
|
|
break;
|
|
case 010: /* fst m32real */
|
|
clear_C1();
|
|
FPU_store_single(st0_ptr, st0_tag, (float __user *)data_address);
|
|
break;
|
|
case 011: /* fist m32int */
|
|
clear_C1();
|
|
FPU_store_int32(st0_ptr, st0_tag, (long __user *)data_address);
|
|
break;
|
|
case 012: /* fst m64real */
|
|
clear_C1();
|
|
FPU_store_double(st0_ptr, st0_tag, (double __user *)data_address);
|
|
break;
|
|
case 013: /* fist m16int */
|
|
clear_C1();
|
|
FPU_store_int16(st0_ptr, st0_tag, (short __user *)data_address);
|
|
break;
|
|
case 014: /* fstp m32real */
|
|
clear_C1();
|
|
if ( FPU_store_single(st0_ptr, st0_tag, (float __user *)data_address) )
|
|
pop_0(); /* pop only if the number was actually stored
|
|
(see the 80486 manual p16-28) */
|
|
break;
|
|
case 015: /* fistp m32int */
|
|
clear_C1();
|
|
if ( FPU_store_int32(st0_ptr, st0_tag, (long __user *)data_address) )
|
|
pop_0(); /* pop only if the number was actually stored
|
|
(see the 80486 manual p16-28) */
|
|
break;
|
|
case 016: /* fstp m64real */
|
|
clear_C1();
|
|
if ( FPU_store_double(st0_ptr, st0_tag, (double __user *)data_address) )
|
|
pop_0(); /* pop only if the number was actually stored
|
|
(see the 80486 manual p16-28) */
|
|
break;
|
|
case 017: /* fistp m16int */
|
|
clear_C1();
|
|
if ( FPU_store_int16(st0_ptr, st0_tag, (short __user *)data_address) )
|
|
pop_0(); /* pop only if the number was actually stored
|
|
(see the 80486 manual p16-28) */
|
|
break;
|
|
case 020: /* fldenv m14/28byte */
|
|
fldenv(addr_modes, (u_char __user *)data_address);
|
|
/* Ensure that the values just loaded are not changed by
|
|
fix-up operations. */
|
|
return 1;
|
|
case 022: /* frstor m94/108byte */
|
|
frstor(addr_modes, (u_char __user *)data_address);
|
|
/* Ensure that the values just loaded are not changed by
|
|
fix-up operations. */
|
|
return 1;
|
|
case 023: /* fbld m80dec */
|
|
clear_C1();
|
|
loaded_tag = FPU_load_bcd((u_char __user *)data_address);
|
|
FPU_settag0(loaded_tag);
|
|
break;
|
|
case 024: /* fldcw */
|
|
RE_ENTRANT_CHECK_OFF;
|
|
FPU_access_ok(VERIFY_READ, data_address, 2);
|
|
FPU_get_user(control_word, (unsigned short __user *) data_address);
|
|
RE_ENTRANT_CHECK_ON;
|
|
if ( partial_status & ~control_word & CW_Exceptions )
|
|
partial_status |= (SW_Summary | SW_Backward);
|
|
else
|
|
partial_status &= ~(SW_Summary | SW_Backward);
|
|
#ifdef PECULIAR_486
|
|
control_word |= 0x40; /* An 80486 appears to always set this bit */
|
|
#endif /* PECULIAR_486 */
|
|
return 1;
|
|
case 025: /* fld m80real */
|
|
clear_C1();
|
|
loaded_tag = FPU_load_extended((long double __user *)data_address, 0);
|
|
FPU_settag0(loaded_tag);
|
|
break;
|
|
case 027: /* fild m64int */
|
|
clear_C1();
|
|
loaded_tag = FPU_load_int64((long long __user *)data_address);
|
|
FPU_settag0(loaded_tag);
|
|
break;
|
|
case 030: /* fstenv m14/28byte */
|
|
fstenv(addr_modes, (u_char __user *)data_address);
|
|
return 1;
|
|
case 032: /* fsave */
|
|
fsave(addr_modes, (u_char __user *)data_address);
|
|
return 1;
|
|
case 033: /* fbstp m80dec */
|
|
clear_C1();
|
|
if ( FPU_store_bcd(st0_ptr, st0_tag, (u_char __user *)data_address) )
|
|
pop_0(); /* pop only if the number was actually stored
|
|
(see the 80486 manual p16-28) */
|
|
break;
|
|
case 034: /* fstcw m16int */
|
|
RE_ENTRANT_CHECK_OFF;
|
|
FPU_access_ok(VERIFY_WRITE,data_address,2);
|
|
FPU_put_user(control_word, (unsigned short __user *) data_address);
|
|
RE_ENTRANT_CHECK_ON;
|
|
return 1;
|
|
case 035: /* fstp m80real */
|
|
clear_C1();
|
|
if ( FPU_store_extended(st0_ptr, st0_tag, (long double __user *)data_address) )
|
|
pop_0(); /* pop only if the number was actually stored
|
|
(see the 80486 manual p16-28) */
|
|
break;
|
|
case 036: /* fstsw m2byte */
|
|
RE_ENTRANT_CHECK_OFF;
|
|
FPU_access_ok(VERIFY_WRITE,data_address,2);
|
|
FPU_put_user(status_word(),(unsigned short __user *) data_address);
|
|
RE_ENTRANT_CHECK_ON;
|
|
return 1;
|
|
case 037: /* fistp m64int */
|
|
clear_C1();
|
|
if ( FPU_store_int64(st0_ptr, st0_tag, (long long __user *)data_address) )
|
|
pop_0(); /* pop only if the number was actually stored
|
|
(see the 80486 manual p16-28) */
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|