| /*---------------------------------------------------------------------------+ |
| | errors.c | |
| | | |
| | The error handling functions for wm-FPU-emu | |
| | | |
| | Copyright (C) 1992,1993,1994,1996 | |
| | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia | |
| | E-mail billm@jacobi.maths.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/uaccess.h> |
| |
| #include "fpu_emu.h" |
| #include "fpu_system.h" |
| #include "exception.h" |
| #include "status_w.h" |
| #include "control_w.h" |
| #include "reg_constant.h" |
| #include "version.h" |
| |
| /* */ |
| #undef PRINT_MESSAGES |
| /* */ |
| |
| |
| #if 0 |
| void Un_impl(void) |
| { |
| u_char byte1, FPU_modrm; |
| unsigned long address = FPU_ORIG_EIP; |
| |
| RE_ENTRANT_CHECK_OFF; |
| /* No need to check access_ok(), we have previously fetched these bytes. */ |
| printk("Unimplemented FPU Opcode at eip=%p : ", (void __user *) address); |
| if ( FPU_CS == __USER_CS ) |
| { |
| while ( 1 ) |
| { |
| FPU_get_user(byte1, (u_char __user *) address); |
| if ( (byte1 & 0xf8) == 0xd8 ) break; |
| printk("[%02x]", byte1); |
| address++; |
| } |
| printk("%02x ", byte1); |
| FPU_get_user(FPU_modrm, 1 + (u_char __user *) 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); |
| |
| } |
| #endif /* 0 */ |
| |
| |
| /* |
| 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 FPU_printall(void) |
| { |
| int i; |
| static const char *tag_desc[] = { "Valid", "Zero", "ERROR", "Empty", |
| "DeNorm", "Inf", "NaN" }; |
| u_char byte1, FPU_modrm; |
| unsigned long address = FPU_ORIG_EIP; |
| |
| RE_ENTRANT_CHECK_OFF; |
| /* No need to check access_ok(), 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++ ) |
| { |
| FPU_get_user(byte1, (u_char __user *) address); |
| if ( (byte1 & 0xf8) == 0xd8 ) |
| { |
| printk(" %02x", byte1); |
| break; |
| } |
| printk(" [%02x]", byte1); |
| address++; |
| } |
| if ( i == MAX_PRINTED_BYTES ) |
| printk(" [more..]\n"); |
| else |
| { |
| FPU_get_user(FPU_modrm, 1 + (u_char __user *) 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); |
| u_char tagi = FPU_gettagi(i); |
| switch (tagi) |
| { |
| case TAG_Empty: |
| continue; |
| break; |
| case TAG_Zero: |
| case TAG_Special: |
| tagi = FPU_Special(r); |
| case TAG_Valid: |
| printk("st(%d) %c .%04lx %04lx %04lx %04lx e%+-6d ", i, |
| getsign(r) ? '-' : '+', |
| (long)(r->sigh >> 16), |
| (long)(r->sigh & 0xFFFF), |
| (long)(r->sigl >> 16), |
| (long)(r->sigl & 0xFFFF), |
| exponent(r) - EXP_BIAS + 1); |
| break; |
| default: |
| printk("Whoops! Error in errors.c: tag%d is %d ", i, tagi); |
| continue; |
| break; |
| } |
| printk("%s\n", tag_desc[(int) (unsigned) tagi]); |
| } |
| |
| RE_ENTRANT_CHECK_ON; |
| |
| } |
| |
| static struct { |
| int type; |
| const 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 |
| 0x164 in reg_ld_str.c |
| 0x170 in fpu_tags.c |
| 0x171 in fpu_tags.c |
| 0x172 in fpu_tags.c |
| 0x180 in reg_convert.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 |
| */ |
| |
| asmlinkage void FPU_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); |
| FPU_printall(); |
| } |
| #ifdef PRINT_MESSAGES |
| else |
| FPU_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. |
| */ |
| } |
| RE_ENTRANT_CHECK_ON; |
| |
| #ifdef __DEBUG__ |
| math_abort(FPU_info,SIGFPE); |
| #endif /* __DEBUG__ */ |
| |
| } |
| |
| |
| /* Real operation attempted on a NaN. */ |
| /* Returns < 0 if the exception is unmasked */ |
| int real_1op_NaN(FPU_REG *a) |
| { |
| int signalling, isNaN; |
| |
| isNaN = (exponent(a) == EXP_OVER) && (a->sigh & 0x80000000); |
| |
| /* The default result for the case of two "equal" NaNs (signs may |
| differ) is chosen to reproduce 80486 behaviour */ |
| signalling = isNaN && !(a->sigh & 0x40000000); |
| |
| if ( !signalling ) |
| { |
| if ( !isNaN ) /* pseudo-NaN, or other unsupported? */ |
| { |
| if ( control_word & CW_Invalid ) |
| { |
| /* Masked response */ |
| reg_copy(&CONST_QNaN, a); |
| } |
| EXCEPTION(EX_Invalid); |
| return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special; |
| } |
| return TAG_Special; |
| } |
| |
| if ( control_word & CW_Invalid ) |
| { |
| /* The masked response */ |
| if ( !(a->sigh & 0x80000000) ) /* pseudo-NaN ? */ |
| { |
| reg_copy(&CONST_QNaN, a); |
| } |
| /* ensure a Quiet NaN */ |
| a->sigh |= 0x40000000; |
| } |
| |
| EXCEPTION(EX_Invalid); |
| |
| return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special; |
| } |
| |
| |
| /* Real operation attempted on two operands, one a NaN. */ |
| /* Returns < 0 if the exception is unmasked */ |
| int real_2op_NaN(FPU_REG const *b, u_char tagb, |
| int deststnr, |
| FPU_REG const *defaultNaN) |
| { |
| FPU_REG *dest = &st(deststnr); |
| FPU_REG const *a = dest; |
| u_char taga = FPU_gettagi(deststnr); |
| FPU_REG const *x; |
| int signalling, unsupported; |
| |
| if ( taga == TAG_Special ) |
| taga = FPU_Special(a); |
| if ( tagb == TAG_Special ) |
| tagb = FPU_Special(b); |
| |
| /* TW_NaN is also used for unsupported data types. */ |
| unsupported = ((taga == TW_NaN) |
| && !((exponent(a) == EXP_OVER) && (a->sigh & 0x80000000))) |
| || ((tagb == TW_NaN) |
| && !((exponent(b) == EXP_OVER) && (b->sigh & 0x80000000))); |
| if ( unsupported ) |
| { |
| if ( control_word & CW_Invalid ) |
| { |
| /* Masked response */ |
| FPU_copy_to_regi(&CONST_QNaN, TAG_Special, deststnr); |
| } |
| EXCEPTION(EX_Invalid); |
| return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special; |
| } |
| |
| if (taga == TW_NaN) |
| { |
| x = a; |
| if (tagb == TW_NaN) |
| { |
| signalling = !(a->sigh & b->sigh & 0x40000000); |
| if ( significand(b) > significand(a) ) |
| x = b; |
| else if ( significand(b) == significand(a) ) |
| { |
| /* The default result for the case of two "equal" NaNs (signs may |
| differ) is chosen to reproduce 80486 behaviour */ |
| x = defaultNaN; |
| } |
| } |
| else |
| { |
| /* return the quiet version of the NaN in a */ |
| signalling = !(a->sigh & 0x40000000); |
| } |
| } |
| else |
| #ifdef PARANOID |
| if (tagb == 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) || (control_word & CW_Invalid) ) |
| { |
| if ( ! x ) |
| x = b; |
| |
| if ( !(x->sigh & 0x80000000) ) /* pseudo-NaN ? */ |
| x = &CONST_QNaN; |
| |
| FPU_copy_to_regi(x, TAG_Special, deststnr); |
| |
| if ( !signalling ) |
| return TAG_Special; |
| |
| /* ensure a Quiet NaN */ |
| dest->sigh |= 0x40000000; |
| } |
| |
| EXCEPTION(EX_Invalid); |
| |
| return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Special; |
| } |
| |
| |
| /* Invalid arith operation on Valid registers */ |
| /* Returns < 0 if the exception is unmasked */ |
| asmlinkage int arith_invalid(int deststnr) |
| { |
| |
| EXCEPTION(EX_Invalid); |
| |
| if ( control_word & CW_Invalid ) |
| { |
| /* The masked response */ |
| FPU_copy_to_regi(&CONST_QNaN, TAG_Special, deststnr); |
| } |
| |
| return (!(control_word & CW_Invalid) ? FPU_Exception : 0) | TAG_Valid; |
| |
| } |
| |
| |
| /* Divide a finite number by zero */ |
| asmlinkage int FPU_divide_by_zero(int deststnr, u_char sign) |
| { |
| FPU_REG *dest = &st(deststnr); |
| int tag = TAG_Valid; |
| |
| if ( control_word & CW_ZeroDiv ) |
| { |
| /* The masked response */ |
| FPU_copy_to_regi(&CONST_INF, TAG_Special, deststnr); |
| setsign(dest, sign); |
| tag = TAG_Special; |
| } |
| |
| EXCEPTION(EX_ZeroDiv); |
| |
| return (!(control_word & CW_ZeroDiv) ? FPU_Exception : 0) | tag; |
| |
| } |
| |
| |
| /* 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 TAG_Special; |
| } |
| else |
| { |
| EXCEPTION(EX_Denormal); |
| return TAG_Special | FPU_Exception; |
| } |
| } |
| |
| |
| asmlinkage int arith_overflow(FPU_REG *dest) |
| { |
| int tag = TAG_Valid; |
| |
| if ( control_word & CW_Overflow ) |
| { |
| /* The masked response */ |
| /* ###### The response here depends upon the rounding mode */ |
| reg_copy(&CONST_INF, dest); |
| tag = TAG_Special; |
| } |
| else |
| { |
| /* Subtract the magic number from the exponent */ |
| addexponent(dest, (-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 tag; |
| } |
| |
| return tag; |
| |
| } |
| |
| |
| asmlinkage int arith_underflow(FPU_REG *dest) |
| { |
| int tag = TAG_Valid; |
| |
| if ( control_word & CW_Underflow ) |
| { |
| /* The masked response */ |
| if ( exponent16(dest) <= EXP_UNDER - 63 ) |
| { |
| reg_copy(&CONST_Z, dest); |
| partial_status &= ~SW_C1; /* Round down. */ |
| tag = TAG_Zero; |
| } |
| else |
| { |
| stdexp(dest); |
| } |
| } |
| else |
| { |
| /* Add the magic number to the exponent. */ |
| addexponent(dest, (3 * (1 << 13)) + EXTENDED_Ebias); |
| } |
| |
| EXCEPTION(EX_Underflow); |
| if ( control_word & CW_Underflow ) |
| { |
| /* The underflow exception is masked. */ |
| EXCEPTION(EX_Precision); |
| return tag; |
| } |
| |
| return tag; |
| |
| } |
| |
| |
| void FPU_stack_overflow(void) |
| { |
| |
| if ( control_word & CW_Invalid ) |
| { |
| /* The masked response */ |
| top--; |
| FPU_copy_to_reg0(&CONST_QNaN, TAG_Special); |
| } |
| |
| EXCEPTION(EX_StackOver); |
| |
| return; |
| |
| } |
| |
| |
| void FPU_stack_underflow(void) |
| { |
| |
| if ( control_word & CW_Invalid ) |
| { |
| /* The masked response */ |
| FPU_copy_to_reg0(&CONST_QNaN, TAG_Special); |
| } |
| |
| EXCEPTION(EX_StackUnder); |
| |
| return; |
| |
| } |
| |
| |
| void FPU_stack_underflow_i(int i) |
| { |
| |
| if ( control_word & CW_Invalid ) |
| { |
| /* The masked response */ |
| FPU_copy_to_regi(&CONST_QNaN, TAG_Special, i); |
| } |
| |
| EXCEPTION(EX_StackUnder); |
| |
| return; |
| |
| } |
| |
| |
| void FPU_stack_underflow_pop(int i) |
| { |
| |
| if ( control_word & CW_Invalid ) |
| { |
| /* The masked response */ |
| FPU_copy_to_regi(&CONST_QNaN, TAG_Special, i); |
| FPU_pop(); |
| } |
| |
| EXCEPTION(EX_StackUnder); |
| |
| return; |
| |
| } |
| |