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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/i386/math-emu/load_store.c
downloadlinux-stericsson-2.6.12-rc2.tar.gz
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!
Diffstat (limited to 'arch/i386/math-emu/load_store.c')
-rw-r--r--arch/i386/math-emu/load_store.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/arch/i386/math-emu/load_store.c b/arch/i386/math-emu/load_store.c
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index 000000000000..85314be2fef8
--- /dev/null
+++ b/arch/i386/math-emu/load_store.c
@@ -0,0 +1,270 @@
+/*---------------------------------------------------------------------------+
+ | 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;
+}