~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/x86/math-emu/fpu_aux.c

Version: ~ [ linux-5.11 ] ~ [ linux-5.10.17 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.99 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.176 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.221 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.257 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.257 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*---------------------------------------------------------------------------+
  2  |  fpu_aux.c                                                                |
  3  |                                                                           |
  4  | Code to implement some of the FPU auxiliary instructions.                 |
  5  |                                                                           |
  6  | Copyright (C) 1992,1993,1994,1997                                         |
  7  |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
  8  |                  E-mail   billm@suburbia.net                              |
  9  |                                                                           |
 10  |                                                                           |
 11  +---------------------------------------------------------------------------*/
 12 
 13 #include "fpu_system.h"
 14 #include "exception.h"
 15 #include "fpu_emu.h"
 16 #include "status_w.h"
 17 #include "control_w.h"
 18 
 19 static void fnop(void)
 20 {
 21 }
 22 
 23 static void fclex(void)
 24 {
 25         partial_status &=
 26             ~(SW_Backward | SW_Summary | SW_Stack_Fault | SW_Precision |
 27               SW_Underflow | SW_Overflow | SW_Zero_Div | SW_Denorm_Op |
 28               SW_Invalid);
 29         no_ip_update = 1;
 30 }
 31 
 32 /* Needs to be externally visible */
 33 void finit_task(struct task_struct *tsk)
 34 {
 35         struct i387_soft_struct *soft = &tsk->thread.xstate->soft;
 36         struct address *oaddr, *iaddr;
 37         soft->cwd = 0x037f;
 38         soft->swd = 0;
 39         soft->ftop = 0; /* We don't keep top in the status word internally. */
 40         soft->twd = 0xffff;
 41         /* The behaviour is different from that detailed in
 42            Section 15.1.6 of the Intel manual */
 43         oaddr = (struct address *)&soft->foo;
 44         oaddr->offset = 0;
 45         oaddr->selector = 0;
 46         iaddr = (struct address *)&soft->fip;
 47         iaddr->offset = 0;
 48         iaddr->selector = 0;
 49         iaddr->opcode = 0;
 50         soft->no_update = 1;
 51 }
 52 
 53 void finit(void)
 54 {
 55         finit_task(current);
 56 }
 57 
 58 /*
 59  * These are nops on the i387..
 60  */
 61 #define feni fnop
 62 #define fdisi fnop
 63 #define fsetpm fnop
 64 
 65 static FUNC const finit_table[] = {
 66         feni, fdisi, fclex, finit,
 67         fsetpm, FPU_illegal, FPU_illegal, FPU_illegal
 68 };
 69 
 70 void finit_(void)
 71 {
 72         (finit_table[FPU_rm]) ();
 73 }
 74 
 75 static void fstsw_ax(void)
 76 {
 77         *(short *)&FPU_EAX = status_word();
 78         no_ip_update = 1;
 79 }
 80 
 81 static FUNC const fstsw_table[] = {
 82         fstsw_ax, FPU_illegal, FPU_illegal, FPU_illegal,
 83         FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal
 84 };
 85 
 86 void fstsw_(void)
 87 {
 88         (fstsw_table[FPU_rm]) ();
 89 }
 90 
 91 static FUNC const fp_nop_table[] = {
 92         fnop, FPU_illegal, FPU_illegal, FPU_illegal,
 93         FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal
 94 };
 95 
 96 void fp_nop(void)
 97 {
 98         (fp_nop_table[FPU_rm]) ();
 99 }
100 
101 void fld_i_(void)
102 {
103         FPU_REG *st_new_ptr;
104         int i;
105         u_char tag;
106 
107         if (STACK_OVERFLOW) {
108                 FPU_stack_overflow();
109                 return;
110         }
111 
112         /* fld st(i) */
113         i = FPU_rm;
114         if (NOT_EMPTY(i)) {
115                 reg_copy(&st(i), st_new_ptr);
116                 tag = FPU_gettagi(i);
117                 push();
118                 FPU_settag0(tag);
119         } else {
120                 if (control_word & CW_Invalid) {
121                         /* The masked response */
122                         FPU_stack_underflow();
123                 } else
124                         EXCEPTION(EX_StackUnder);
125         }
126 
127 }
128 
129 void fxch_i(void)
130 {
131         /* fxch st(i) */
132         FPU_REG t;
133         int i = FPU_rm;
134         FPU_REG *st0_ptr = &st(0), *sti_ptr = &st(i);
135         long tag_word = fpu_tag_word;
136         int regnr = top & 7, regnri = ((regnr + i) & 7);
137         u_char st0_tag = (tag_word >> (regnr * 2)) & 3;
138         u_char sti_tag = (tag_word >> (regnri * 2)) & 3;
139 
140         if (st0_tag == TAG_Empty) {
141                 if (sti_tag == TAG_Empty) {
142                         FPU_stack_underflow();
143                         FPU_stack_underflow_i(i);
144                         return;
145                 }
146                 if (control_word & CW_Invalid) {
147                         /* Masked response */
148                         FPU_copy_to_reg0(sti_ptr, sti_tag);
149                 }
150                 FPU_stack_underflow_i(i);
151                 return;
152         }
153         if (sti_tag == TAG_Empty) {
154                 if (control_word & CW_Invalid) {
155                         /* Masked response */
156                         FPU_copy_to_regi(st0_ptr, st0_tag, i);
157                 }
158                 FPU_stack_underflow();
159                 return;
160         }
161         clear_C1();
162 
163         reg_copy(st0_ptr, &t);
164         reg_copy(sti_ptr, st0_ptr);
165         reg_copy(&t, sti_ptr);
166 
167         tag_word &= ~(3 << (regnr * 2)) & ~(3 << (regnri * 2));
168         tag_word |= (sti_tag << (regnr * 2)) | (st0_tag << (regnri * 2));
169         fpu_tag_word = tag_word;
170 }
171 
172 void ffree_(void)
173 {
174         /* ffree st(i) */
175         FPU_settagi(FPU_rm, TAG_Empty);
176 }
177 
178 void ffreep(void)
179 {
180         /* ffree st(i) + pop - unofficial code */
181         FPU_settagi(FPU_rm, TAG_Empty);
182         FPU_pop();
183 }
184 
185 void fst_i_(void)
186 {
187         /* fst st(i) */
188         FPU_copy_to_regi(&st(0), FPU_gettag0(), FPU_rm);
189 }
190 
191 void fstp_i(void)
192 {
193         /* fstp st(i) */
194         FPU_copy_to_regi(&st(0), FPU_gettag0(), FPU_rm);
195         FPU_pop();
196 }
197 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp