diff options
Diffstat (limited to 'drivers/FPU-emu/errors.c')
| -rw-r--r-- | drivers/FPU-emu/errors.c | 671 |
1 files changed, 0 insertions, 671 deletions
diff --git a/drivers/FPU-emu/errors.c b/drivers/FPU-emu/errors.c deleted file mode 100644 index e34eec942..000000000 --- a/drivers/FPU-emu/errors.c +++ /dev/null @@ -1,671 +0,0 @@ -/*---------------------------------------------------------------------------+ - | errors.c | - | | - | The error handling functions for wm-FPU-emu | - | | - | Copyright (C) 1992,1993,1994 | - | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | - | Australia. E-mail billm@vaxc.cc.monash.edu.au | - | | - | | - +---------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------+ - | 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 <linux/signal.h> - -#include <asm/segment.h> - -#include "fpu_system.h" -#include "exception.h" -#include "fpu_emu.h" -#include "status_w.h" -#include "control_w.h" -#include "reg_constant.h" -#include "version.h" - -/* */ -#undef PRINT_MESSAGES -/* */ - - -void Un_impl(void) -{ - unsigned char byte1, FPU_modrm; - unsigned long address = FPU_ORIG_EIP; - - RE_ENTRANT_CHECK_OFF; - /* No need to verify_area(), we have previously fetched these bytes. */ - printk("Unimplemented FPU Opcode at eip=%p : ", (void *) address); - if ( FPU_CS == USER_CS ) - { - while ( 1 ) - { - byte1 = get_fs_byte((unsigned char *) address); - if ( (byte1 & 0xf8) == 0xd8 ) break; - printk("[%02x]", byte1); - address++; - } - printk("%02x ", byte1); - FPU_modrm = get_fs_byte(1 + (unsigned char *) address); - - if (FPU_modrm >= 0300) - printk("%02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7); - else - printk("/%d\n", (FPU_modrm >> 3) & 7); - } - else - { - printk("cs selector = %04x\n", FPU_CS); - } - - RE_ENTRANT_CHECK_ON; - - EXCEPTION(EX_Invalid); - -} - - -/* - Called for opcodes which are illegal and which are known to result in a - SIGILL with a real 80486. - */ -void FPU_illegal(void) -{ - math_abort(FPU_info,SIGILL); -} - - - -void emu_printall() -{ - int i; - static char *tag_desc[] = { "Valid", "Zero", "ERROR", "ERROR", - "DeNorm", "Inf", "NaN", "Empty" }; - unsigned char byte1, FPU_modrm; - unsigned long address = FPU_ORIG_EIP; - - RE_ENTRANT_CHECK_OFF; - /* No need to verify_area(), we have previously fetched these bytes. */ - printk("At %p:", (void *) address); - if ( FPU_CS == USER_CS ) - { -#define MAX_PRINTED_BYTES 20 - for ( i = 0; i < MAX_PRINTED_BYTES; i++ ) - { - byte1 = get_fs_byte((unsigned char *) address); - if ( (byte1 & 0xf8) == 0xd8 ) - { - printk(" %02x", byte1); - break; - } - printk(" [%02x]", byte1); - address++; - } - if ( i == MAX_PRINTED_BYTES ) - printk(" [more..]\n"); - else - { - FPU_modrm = get_fs_byte(1 + (unsigned char *) address); - - if (FPU_modrm >= 0300) - printk(" %02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7); - else - printk(" /%d, mod=%d rm=%d\n", - (FPU_modrm >> 3) & 7, (FPU_modrm >> 6) & 3, FPU_modrm & 7); - } - } - else - { - printk("%04x\n", FPU_CS); - } - - partial_status = status_word(); - -#ifdef DEBUGGING -if ( partial_status & SW_Backward ) printk("SW: backward compatibility\n"); -if ( partial_status & SW_C3 ) printk("SW: condition bit 3\n"); -if ( partial_status & SW_C2 ) printk("SW: condition bit 2\n"); -if ( partial_status & SW_C1 ) printk("SW: condition bit 1\n"); -if ( partial_status & SW_C0 ) printk("SW: condition bit 0\n"); -if ( partial_status & SW_Summary ) printk("SW: exception summary\n"); -if ( partial_status & SW_Stack_Fault ) printk("SW: stack fault\n"); -if ( partial_status & SW_Precision ) printk("SW: loss of precision\n"); -if ( partial_status & SW_Underflow ) printk("SW: underflow\n"); -if ( partial_status & SW_Overflow ) printk("SW: overflow\n"); -if ( partial_status & SW_Zero_Div ) printk("SW: divide by zero\n"); -if ( partial_status & SW_Denorm_Op ) printk("SW: denormalized operand\n"); -if ( partial_status & SW_Invalid ) printk("SW: invalid operation\n"); -#endif DEBUGGING - - printk(" SW: b=%d st=%ld es=%d sf=%d cc=%d%d%d%d ef=%d%d%d%d%d%d\n", - partial_status & 0x8000 ? 1 : 0, /* busy */ - (partial_status & 0x3800) >> 11, /* stack top pointer */ - partial_status & 0x80 ? 1 : 0, /* Error summary status */ - partial_status & 0x40 ? 1 : 0, /* Stack flag */ - partial_status & SW_C3?1:0, partial_status & SW_C2?1:0, /* cc */ - partial_status & SW_C1?1:0, partial_status & SW_C0?1:0, /* cc */ - partial_status & SW_Precision?1:0, partial_status & SW_Underflow?1:0, - partial_status & SW_Overflow?1:0, partial_status & SW_Zero_Div?1:0, - partial_status & SW_Denorm_Op?1:0, partial_status & SW_Invalid?1:0); - -printk(" CW: ic=%d rc=%ld%ld pc=%ld%ld iem=%d ef=%d%d%d%d%d%d\n", - control_word & 0x1000 ? 1 : 0, - (control_word & 0x800) >> 11, (control_word & 0x400) >> 10, - (control_word & 0x200) >> 9, (control_word & 0x100) >> 8, - control_word & 0x80 ? 1 : 0, - control_word & SW_Precision?1:0, control_word & SW_Underflow?1:0, - control_word & SW_Overflow?1:0, control_word & SW_Zero_Div?1:0, - control_word & SW_Denorm_Op?1:0, control_word & SW_Invalid?1:0); - - for ( i = 0; i < 8; i++ ) - { - FPU_REG *r = &st(i); - switch (r->tag) - { - case TW_Empty: - continue; - break; - case TW_Zero: -#if 0 - printk("st(%d) %c .0000 0000 0000 0000 ", - i, r->sign ? '-' : '+'); - break; -#endif - case TW_Valid: - case TW_NaN: -/* case TW_Denormal: */ - case TW_Infinity: - printk("st(%d) %c .%04lx %04lx %04lx %04lx e%+-6ld ", i, - r->sign ? '-' : '+', - (long)(r->sigh >> 16), - (long)(r->sigh & 0xFFFF), - (long)(r->sigl >> 16), - (long)(r->sigl & 0xFFFF), - r->exp - EXP_BIAS + 1); - break; - default: - printk("Whoops! Error in errors.c "); - break; - } - printk("%s\n", tag_desc[(int) (unsigned) r->tag]); - } - -#ifdef OBSOLETE - printk("[data] %c .%04lx %04lx %04lx %04lx e%+-6ld ", - FPU_loaded_data.sign ? '-' : '+', - (long)(FPU_loaded_data.sigh >> 16), - (long)(FPU_loaded_data.sigh & 0xFFFF), - (long)(FPU_loaded_data.sigl >> 16), - (long)(FPU_loaded_data.sigl & 0xFFFF), - FPU_loaded_data.exp - EXP_BIAS + 1); - printk("%s\n", tag_desc[(int) (unsigned) FPU_loaded_data.tag]); -#endif OBSOLETE - RE_ENTRANT_CHECK_ON; - -} - -static struct { - int type; - char *name; -} exception_names[] = { - { EX_StackOver, "stack overflow" }, - { EX_StackUnder, "stack underflow" }, - { EX_Precision, "loss of precision" }, - { EX_Underflow, "underflow" }, - { EX_Overflow, "overflow" }, - { EX_ZeroDiv, "divide by zero" }, - { EX_Denormal, "denormalized operand" }, - { EX_Invalid, "invalid operation" }, - { EX_INTERNAL, "INTERNAL BUG in "FPU_VERSION }, - { 0, NULL } -}; - -/* - EX_INTERNAL is always given with a code which indicates where the - error was detected. - - Internal error types: - 0x14 in fpu_etc.c - 0x1nn in a *.c file: - 0x101 in reg_add_sub.c - 0x102 in reg_mul.c - 0x104 in poly_atan.c - 0x105 in reg_mul.c - 0x107 in fpu_trig.c - 0x108 in reg_compare.c - 0x109 in reg_compare.c - 0x110 in reg_add_sub.c - 0x111 in fpe_entry.c - 0x112 in fpu_trig.c - 0x113 in errors.c - 0x115 in fpu_trig.c - 0x116 in fpu_trig.c - 0x117 in fpu_trig.c - 0x118 in fpu_trig.c - 0x119 in fpu_trig.c - 0x120 in poly_atan.c - 0x121 in reg_compare.c - 0x122 in reg_compare.c - 0x123 in reg_compare.c - 0x125 in fpu_trig.c - 0x126 in fpu_entry.c - 0x127 in poly_2xm1.c - 0x128 in fpu_entry.c - 0x129 in fpu_entry.c - 0x130 in get_address.c - 0x131 in get_address.c - 0x132 in get_address.c - 0x133 in get_address.c - 0x140 in load_store.c - 0x141 in load_store.c - 0x150 in poly_sin.c - 0x151 in poly_sin.c - 0x160 in reg_ld_str.c - 0x161 in reg_ld_str.c - 0x162 in reg_ld_str.c - 0x163 in reg_ld_str.c - 0x2nn in an *.S file: - 0x201 in reg_u_add.S - 0x202 in reg_u_div.S - 0x203 in reg_u_div.S - 0x204 in reg_u_div.S - 0x205 in reg_u_mul.S - 0x206 in reg_u_sub.S - 0x207 in wm_sqrt.S - 0x208 in reg_div.S - 0x209 in reg_u_sub.S - 0x210 in reg_u_sub.S - 0x211 in reg_u_sub.S - 0x212 in reg_u_sub.S - 0x213 in wm_sqrt.S - 0x214 in wm_sqrt.S - 0x215 in wm_sqrt.S - 0x220 in reg_norm.S - 0x221 in reg_norm.S - 0x230 in reg_round.S - 0x231 in reg_round.S - 0x232 in reg_round.S - 0x233 in reg_round.S - 0x234 in reg_round.S - 0x235 in reg_round.S - 0x236 in reg_round.S - 0x240 in div_Xsig.S - 0x241 in div_Xsig.S - 0x242 in div_Xsig.S - */ - -void exception(int n) -{ - int i, int_type; - - int_type = 0; /* Needed only to stop compiler warnings */ - if ( n & EX_INTERNAL ) - { - int_type = n - EX_INTERNAL; - n = EX_INTERNAL; - /* Set lots of exception bits! */ - partial_status |= (SW_Exc_Mask | SW_Summary | SW_Backward); - } - else - { - /* Extract only the bits which we use to set the status word */ - n &= (SW_Exc_Mask); - /* Set the corresponding exception bit */ - partial_status |= n; - /* Set summary bits iff exception isn't masked */ - if ( partial_status & ~control_word & CW_Exceptions ) - partial_status |= (SW_Summary | SW_Backward); - if ( n & (SW_Stack_Fault | EX_Precision) ) - { - if ( !(n & SW_C1) ) - /* This bit distinguishes over- from underflow for a stack fault, - and roundup from round-down for precision loss. */ - partial_status &= ~SW_C1; - } - } - - RE_ENTRANT_CHECK_OFF; - if ( (~control_word & n & CW_Exceptions) || (n == EX_INTERNAL) ) - { -#ifdef PRINT_MESSAGES - /* My message from the sponsor */ - printk(FPU_VERSION" "__DATE__" (C) W. Metzenthen.\n"); -#endif PRINT_MESSAGES - - /* Get a name string for error reporting */ - for (i=0; exception_names[i].type; i++) - if ( (exception_names[i].type & n) == exception_names[i].type ) - break; - - if (exception_names[i].type) - { -#ifdef PRINT_MESSAGES - printk("FP Exception: %s!\n", exception_names[i].name); -#endif PRINT_MESSAGES - } - else - printk("FPU emulator: Unknown Exception: 0x%04x!\n", n); - - if ( n == EX_INTERNAL ) - { - printk("FPU emulator: Internal error type 0x%04x\n", int_type); - emu_printall(); - } -#ifdef PRINT_MESSAGES - else - emu_printall(); -#endif PRINT_MESSAGES - - /* - * The 80486 generates an interrupt on the next non-control FPU - * instruction. So we need some means of flagging it. - * We use the ES (Error Summary) bit for this, assuming that - * this is the way a real FPU does it (until I can check it out), - * if not, then some method such as the following kludge might - * be needed. - */ -/* regs[0].tag |= TW_FPU_Interrupt; */ - } - RE_ENTRANT_CHECK_ON; - -#ifdef __DEBUG__ - math_abort(FPU_info,SIGFPE); -#endif __DEBUG__ - -} - - -/* Real operation attempted on two operands, one a NaN. */ -/* Returns nz if the exception is unmasked */ -asmlinkage int real_2op_NaN(FPU_REG const *a, FPU_REG const *b, FPU_REG *dest) -{ - FPU_REG const *x; - int signalling; - - /* The default result for the case of two "equal" NaNs (signs may - differ) is chosen to reproduce 80486 behaviour */ - x = a; - if (a->tag == TW_NaN) - { - if (b->tag == TW_NaN) - { - signalling = !(a->sigh & b->sigh & 0x40000000); - /* find the "larger" */ - if ( significand(a) < significand(b) ) - x = b; - } - else - { - /* return the quiet version of the NaN in a */ - signalling = !(a->sigh & 0x40000000); - } - } - else -#ifdef PARANOID - if (b->tag == TW_NaN) -#endif PARANOID - { - signalling = !(b->sigh & 0x40000000); - x = b; - } -#ifdef PARANOID - else - { - signalling = 0; - EXCEPTION(EX_INTERNAL|0x113); - x = &CONST_QNaN; - } -#endif PARANOID - - if ( !signalling ) - { - if ( !(x->sigh & 0x80000000) ) /* pseudo-NaN ? */ - x = &CONST_QNaN; - reg_move(x, dest); - return 0; - } - - if ( control_word & CW_Invalid ) - { - /* The masked response */ - if ( !(x->sigh & 0x80000000) ) /* pseudo-NaN ? */ - x = &CONST_QNaN; - reg_move(x, dest); - /* ensure a Quiet NaN */ - dest->sigh |= 0x40000000; - } - - EXCEPTION(EX_Invalid); - - return !(control_word & CW_Invalid); -} - - -/* Invalid arith operation on Valid registers */ -/* Returns nz if the exception is unmasked */ -asmlinkage int arith_invalid(FPU_REG *dest) -{ - - EXCEPTION(EX_Invalid); - - if ( control_word & CW_Invalid ) - { - /* The masked response */ - reg_move(&CONST_QNaN, dest); - } - - return !(control_word & CW_Invalid); - -} - - -/* Divide a finite number by zero */ -asmlinkage int divide_by_zero(int sign, FPU_REG *dest) -{ - - if ( control_word & CW_ZeroDiv ) - { - /* The masked response */ - reg_move(&CONST_INF, dest); - dest->sign = (unsigned char)sign; - } - - EXCEPTION(EX_ZeroDiv); - - return !(control_word & CW_ZeroDiv); - -} - - -/* This may be called often, so keep it lean */ -int set_precision_flag(int flags) -{ - if ( control_word & CW_Precision ) - { - partial_status &= ~(SW_C1 & flags); - partial_status |= flags; /* The masked response */ - return 0; - } - else - { - exception(flags); - return 1; - } -} - - -/* This may be called often, so keep it lean */ -asmlinkage void set_precision_flag_up(void) -{ - if ( control_word & CW_Precision ) - partial_status |= (SW_Precision | SW_C1); /* The masked response */ - else - exception(EX_Precision | SW_C1); - -} - - -/* This may be called often, so keep it lean */ -asmlinkage void set_precision_flag_down(void) -{ - if ( control_word & CW_Precision ) - { /* The masked response */ - partial_status &= ~SW_C1; - partial_status |= SW_Precision; - } - else - exception(EX_Precision); -} - - -asmlinkage int denormal_operand(void) -{ - if ( control_word & CW_Denormal ) - { /* The masked response */ - partial_status |= SW_Denorm_Op; - return 0; - } - else - { - exception(EX_Denormal); - return 1; - } -} - - -asmlinkage int arith_overflow(FPU_REG *dest) -{ - - if ( control_word & CW_Overflow ) - { - char sign; - /* The masked response */ -/* ###### The response here depends upon the rounding mode */ - sign = dest->sign; - reg_move(&CONST_INF, dest); - dest->sign = sign; - } - else - { - /* Subtract the magic number from the exponent */ - dest->exp -= (3 * (1 << 13)); - } - - EXCEPTION(EX_Overflow); - if ( control_word & CW_Overflow ) - { - /* The overflow exception is masked. */ - /* By definition, precision is lost. - The roundup bit (C1) is also set because we have - "rounded" upwards to Infinity. */ - EXCEPTION(EX_Precision | SW_C1); - return !(control_word & CW_Precision); - } - - return !(control_word & CW_Overflow); - -} - - -asmlinkage int arith_underflow(FPU_REG *dest) -{ - - if ( control_word & CW_Underflow ) - { - /* The masked response */ - if ( dest->exp <= EXP_UNDER - 63 ) - { - reg_move(&CONST_Z, dest); - partial_status &= ~SW_C1; /* Round down. */ - } - } - else - { - /* Add the magic number to the exponent. */ - dest->exp += (3 * (1 << 13)); - } - - EXCEPTION(EX_Underflow); - if ( control_word & CW_Underflow ) - { - /* The underflow exception is masked. */ - EXCEPTION(EX_Precision); - return !(control_word & CW_Precision); - } - - return !(control_word & CW_Underflow); - -} - - -void stack_overflow(void) -{ - - if ( control_word & CW_Invalid ) - { - /* The masked response */ - top--; - reg_move(&CONST_QNaN, &st(0)); - } - - EXCEPTION(EX_StackOver); - - return; - -} - - -void stack_underflow(void) -{ - - if ( control_word & CW_Invalid ) - { - /* The masked response */ - reg_move(&CONST_QNaN, &st(0)); - } - - EXCEPTION(EX_StackUnder); - - return; - -} - - -void stack_underflow_i(int i) -{ - - if ( control_word & CW_Invalid ) - { - /* The masked response */ - reg_move(&CONST_QNaN, &(st(i))); - } - - EXCEPTION(EX_StackUnder); - - return; - -} - - -void stack_underflow_pop(int i) -{ - - if ( control_word & CW_Invalid ) - { - /* The masked response */ - reg_move(&CONST_QNaN, &(st(i))); - pop(); - } - - EXCEPTION(EX_StackUnder); - - return; - -} - |