X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fi387-tdep.c;h=4b212c4cd97bc8b5f1807b36bd2a0cfde66b67be;hb=fabf64aa42dc3a82e874465d4a3929ee37ed62db;hp=0a85e2ea10c5d4f9a4385b045bd8f1808b326fb4;hpb=7d9884b92772d5b4fa0de57de5caca2d9308c16c;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/i387-tdep.c b/gdb/i387-tdep.c index 0a85e2ea10..4b212c4cd9 100644 --- a/gdb/i387-tdep.c +++ b/gdb/i387-tdep.c @@ -1,126 +1,784 @@ /* Intel 387 floating point stuff. - Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc. -This file is part of GDB. + Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, + 2001, 2002, 2003, 2004 Free Software Foundation, Inc. -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. + This file is part of GDB. -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ -#include #include "defs.h" +#include "doublest.h" +#include "floatformat.h" #include "frame.h" +#include "gdbcore.h" #include "inferior.h" #include "language.h" -#include "gdbcore.h" -#include "ieee-float.h" +#include "regcache.h" +#include "value.h" + +#include "gdb_assert.h" +#include "gdb_string.h" + +#include "i386-tdep.h" +#include "i387-tdep.h" + +/* Implement the `info float' layout based on the register definitions + in `tm-i386.h'. */ + +/* Print the floating point number specified by RAW. */ + +static void +print_i387_value (char *raw, struct ui_file *file) +{ + DOUBLEST value; + + /* Using extract_typed_floating here might affect the representation + of certain numbers such as NaNs, even if GDB is running natively. + This is fine since our caller already detects such special + numbers and we print the hexadecimal representation anyway. */ + value = extract_typed_floating (raw, builtin_type_i387_ext); -#ifdef USG -#include + /* We try to print 19 digits. The last digit may or may not contain + garbage, but we'd better print one too many. We need enough room + to print the value, 1 position for the sign, 1 for the decimal + point, 19 for the digits and 6 for the exponent adds up to 27. */ +#ifdef PRINTF_HAS_LONG_DOUBLE + fprintf_filtered (file, " %-+27.19Lg", (long double) value); +#else + fprintf_filtered (file, " %-+27.19g", (double) value); #endif +} -#include -#include -#include -#include -#include -#include +/* Print the classification for the register contents RAW. */ -#include -#include +static void +print_i387_ext (unsigned char *raw, struct ui_file *file) +{ + int sign; + int integer; + unsigned int exponent; + unsigned long fraction[2]; -#include + sign = raw[9] & 0x80; + integer = raw[7] & 0x80; + exponent = (((raw[9] & 0x7f) << 8) | raw[8]); + fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); + fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) + | (raw[5] << 8) | raw[4]); -struct ext_format ext_format_i387 = { -/* tot sbyte smask expbyte manbyte */ - 10, 9, 0x80, 9,8, 4,0 /* i387 */ -}; + if (exponent == 0x7fff && integer) + { + if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) + /* Infinity. */ + fprintf_filtered (file, " %cInf", (sign ? '-' : '+')); + else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) + /* Real Indefinite (QNaN). */ + fputs_unfiltered (" Real Indefinite (QNaN)", file); + else if (fraction[1] & 0x40000000) + /* QNaN. */ + fputs_filtered (" QNaN", file); + else + /* SNaN. */ + fputs_filtered (" SNaN", file); + } + else if (exponent < 0x7fff && exponent > 0x0000 && integer) + /* Normal. */ + print_i387_value (raw, file); + else if (exponent == 0x0000) + { + /* Denormal or zero. */ + print_i387_value (raw, file); + + if (integer) + /* Pseudo-denormal. */ + fputs_filtered (" Pseudo-denormal", file); + else if (fraction[0] || fraction[1]) + /* Denormal. */ + fputs_filtered (" Denormal", file); + } + else + /* Unsupported. */ + fputs_filtered (" Unsupported", file); +} -/* FIXME: Eliminate these routines when we have the time to change all - the callers. */ -void -i387_to_double (from, to) - char *from, *to; +/* Print the status word STATUS. */ + +static void +print_i387_status_word (unsigned int status, struct ui_file *file) { - ieee_extended_to_double (&ext_format_i387, from, (double *)to); + fprintf_filtered (file, "Status Word: %s", + local_hex_string_custom (status, "04")); + fputs_filtered (" ", file); + fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " "); + fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " "); + fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : " "); + fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : " "); + fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : " "); + fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : " "); + fputs_filtered (" ", file); + fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : " "); + fputs_filtered (" ", file); + fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : " "); + fputs_filtered (" ", file); + fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : " "); + fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : " "); + fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : " "); + fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : " "); + + fputs_filtered ("\n", file); + + fprintf_filtered (file, + " TOP: %d\n", ((status >> 11) & 7)); } +/* Print the control word CONTROL. */ + +static void +print_i387_control_word (unsigned int control, struct ui_file *file) +{ + fprintf_filtered (file, "Control Word: %s", + local_hex_string_custom (control, "04")); + fputs_filtered (" ", file); + fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " "); + fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " "); + fprintf_filtered (file, " %s", (control & 0x0004) ? "ZM" : " "); + fprintf_filtered (file, " %s", (control & 0x0008) ? "OM" : " "); + fprintf_filtered (file, " %s", (control & 0x0010) ? "UM" : " "); + fprintf_filtered (file, " %s", (control & 0x0020) ? "PM" : " "); + + fputs_filtered ("\n", file); + + fputs_filtered (" PC: ", file); + switch ((control >> 8) & 3) + { + case 0: + fputs_filtered ("Single Precision (24-bits)\n", file); + break; + case 1: + fputs_filtered ("Reserved\n", file); + break; + case 2: + fputs_filtered ("Double Precision (53-bits)\n", file); + break; + case 3: + fputs_filtered ("Extended Precision (64-bits)\n", file); + break; + } + + fputs_filtered (" RC: ", file); + switch ((control >> 10) & 3) + { + case 0: + fputs_filtered ("Round to nearest\n", file); + break; + case 1: + fputs_filtered ("Round down\n", file); + break; + case 2: + fputs_filtered ("Round up\n", file); + break; + case 3: + fputs_filtered ("Round toward zero\n", file); + break; + } +} + +/* Print out the i387 floating point state. Note that we ignore FRAME + in the code below. That's OK since floating-point registers are + never saved on the stack. */ + void -double_to_i387 (from, to) - char *from, *to; +i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, + struct frame_info *frame, const char *args) { - double_to_ieee_extended (&ext_format_i387, (double *)from, to); + struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); + char buf[4]; + ULONGEST fctrl; + ULONGEST fstat; + ULONGEST ftag; + ULONGEST fiseg; + ULONGEST fioff; + ULONGEST foseg; + ULONGEST fooff; + ULONGEST fop; + int fpreg; + int top; + + gdb_assert (gdbarch == get_frame_arch (frame)); + + /* Define I387_ST0_REGNUM such that we use the proper definitions + for FRAME's architecture. */ +#define I387_ST0_REGNUM tdep->st0_regnum + + fctrl = get_frame_register_unsigned (frame, I387_FCTRL_REGNUM); + fstat = get_frame_register_unsigned (frame, I387_FSTAT_REGNUM); + ftag = get_frame_register_unsigned (frame, I387_FTAG_REGNUM); + fiseg = get_frame_register_unsigned (frame, I387_FISEG_REGNUM); + fioff = get_frame_register_unsigned (frame, I387_FIOFF_REGNUM); + foseg = get_frame_register_unsigned (frame, I387_FOSEG_REGNUM); + fooff = get_frame_register_unsigned (frame, I387_FOOFF_REGNUM); + fop = get_frame_register_unsigned (frame, I387_FOP_REGNUM); + + top = ((fstat >> 11) & 7); + + for (fpreg = 7; fpreg >= 0; fpreg--) + { + unsigned char raw[I386_MAX_REGISTER_SIZE]; + int tag = (ftag >> (fpreg * 2)) & 3; + int i; + + fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg); + + switch (tag) + { + case 0: + fputs_filtered ("Valid ", file); + break; + case 1: + fputs_filtered ("Zero ", file); + break; + case 2: + fputs_filtered ("Special ", file); + break; + case 3: + fputs_filtered ("Empty ", file); + break; + } + + get_frame_register (frame, (fpreg + 8 - top) % 8 + I387_ST0_REGNUM, raw); + + fputs_filtered ("0x", file); + for (i = 9; i >= 0; i--) + fprintf_filtered (file, "%02x", raw[i]); + + if (tag != 3) + print_i387_ext (raw, file); + + fputs_filtered ("\n", file); + } + + fputs_filtered ("\n", file); + + print_i387_status_word (fstat, file); + print_i387_control_word (fctrl, file); + fprintf_filtered (file, "Tag Word: %s\n", + local_hex_string_custom (ftag, "04")); + fprintf_filtered (file, "Instruction Pointer: %s:", + local_hex_string_custom (fiseg, "02")); + fprintf_filtered (file, "%s\n", local_hex_string_custom (fioff, "08")); + fprintf_filtered (file, "Operand Pointer: %s:", + local_hex_string_custom (foseg, "02")); + fprintf_filtered (file, "%s\n", local_hex_string_custom (fooff, "08")); + fprintf_filtered (file, "Opcode: %s\n", + local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); + +#undef I387_ST0_REGNUM } + + +/* Read a value of type TYPE from register REGNUM in frame FRAME, and + return its contents in TO. */ void -print_387_control_word (control) -unsigned short control; +i387_register_to_value (struct frame_info *frame, int regnum, + struct type *type, void *to) { - printf ("control %s: ", local_hex_string(control)); - printf ("compute to "); - switch ((control >> 8) & 3) + char from[I386_MAX_REGISTER_SIZE]; + + gdb_assert (i386_fp_regnum_p (regnum)); + + /* We only support floating-point values. */ + if (TYPE_CODE (type) != TYPE_CODE_FLT) { - case 0: printf ("24 bits; "); break; - case 1: printf ("(bad); "); break; - case 2: printf ("53 bits; "); break; - case 3: printf ("64 bits; "); break; + warning ("Cannot convert floating-point register value " + "to non-floating-point type."); + return; } - printf ("round "); - switch ((control >> 10) & 3) + + /* Convert to TYPE. This should be a no-op if TYPE is equivalent to + the extended floating-point format used by the FPU. */ + get_frame_register (frame, regnum, from); + convert_typed_floating (from, builtin_type_i387_ext, to, type); +} + +/* Write the contents FROM of a value of type TYPE into register + REGNUM in frame FRAME. */ + +void +i387_value_to_register (struct frame_info *frame, int regnum, + struct type *type, const void *from) +{ + char to[I386_MAX_REGISTER_SIZE]; + + gdb_assert (i386_fp_regnum_p (regnum)); + + /* We only support floating-point values. */ + if (TYPE_CODE (type) != TYPE_CODE_FLT) { - case 0: printf ("NEAREST; "); break; - case 1: printf ("DOWN; "); break; - case 2: printf ("UP; "); break; - case 3: printf ("CHOP; "); break; + warning ("Cannot convert non-floating-point type " + "to floating-point register value."); + return; } - if (control & 0x3f) + + /* Convert from TYPE. This should be a no-op if TYPE is equivalent + to the extended floating-point format used by the FPU. */ + convert_typed_floating (from, type, to, builtin_type_i387_ext); + put_frame_register (frame, regnum, to); +} + + + +/* Handle FSAVE and FXSAVE formats. */ + +/* FIXME: kettenis/20030927: The functions below should accept a + `regcache' argument, but I don't want to change the function + signature just yet. There's some band-aid in the functions below + in the form of the `regcache' local variables. This will ease the + transition later on. */ + +/* At fsave_offset[REGNUM] you'll find the offset to the location in + the data structure used by the "fsave" instruction where GDB + register REGNUM is stored. */ + +static int fsave_offset[] = +{ + 28 + 0 * 10, /* %st(0) ... */ + 28 + 1 * 10, + 28 + 2 * 10, + 28 + 3 * 10, + 28 + 4 * 10, + 28 + 5 * 10, + 28 + 6 * 10, + 28 + 7 * 10, /* ... %st(7). */ + 0, /* `fctrl' (16 bits). */ + 4, /* `fstat' (16 bits). */ + 8, /* `ftag' (16 bits). */ + 16, /* `fiseg' (16 bits). */ + 12, /* `fioff'. */ + 24, /* `foseg' (16 bits). */ + 20, /* `fooff'. */ + 18 /* `fop' (bottom 11 bits). */ +}; + +#define FSAVE_ADDR(fsave, regnum) \ + (fsave + fsave_offset[regnum - I387_ST0_REGNUM]) + + +/* Fill register REGNUM in REGCACHE with the appropriate value from + *FSAVE. This function masks off any of the reserved bits in + *FSAVE. */ + +void +i387_supply_fsave (struct regcache *regcache, int regnum, const void *fsave) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); + const char *regs = fsave; + int i; + + gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); + + /* Define I387_ST0_REGNUM such that we use the proper definitions + for REGCACHE's architecture. */ +#define I387_ST0_REGNUM tdep->st0_regnum + + for (i = I387_ST0_REGNUM; i < I387_XMM0_REGNUM; i++) + if (regnum == -1 || regnum == i) + { + if (fsave == NULL) + { + regcache_raw_supply (regcache, i, NULL); + continue; + } + + /* Most of the FPU control registers occupy only 16 bits in the + fsave area. Give those a special treatment. */ + if (i >= I387_FCTRL_REGNUM + && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM) + { + unsigned char val[4]; + + memcpy (val, FSAVE_ADDR (regs, i), 2); + val[2] = val[3] = 0; + if (i == I387_FOP_REGNUM) + val[1] &= ((1 << 3) - 1); + regcache_raw_supply (regcache, i, val); + } + else + regcache_raw_supply (regcache, i, FSAVE_ADDR (regs, i)); + } +#undef I387_ST0_REGNUM +} + +/* Fill register REGNUM (if it is a floating-point register) in *FSAVE + with the value from REGCACHE. If REGNUM is -1, do this for all + registers. This function doesn't touch any of the reserved bits in + *FSAVE. */ + +void +i387_collect_fsave (const struct regcache *regcache, int regnum, void *fsave) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + char *regs = fsave; + int i; + + gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); + + /* Define I387_ST0_REGNUM such that we use the proper definitions + for REGCACHE's architecture. */ +#define I387_ST0_REGNUM tdep->st0_regnum + + for (i = I387_ST0_REGNUM; i < I387_XMM0_REGNUM; i++) + if (regnum == -1 || regnum == i) + { + /* Most of the FPU control registers occupy only 16 bits in + the fsave area. Give those a special treatment. */ + if (i >= I387_FCTRL_REGNUM + && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM) + { + unsigned char buf[4]; + + regcache_raw_collect (regcache, i, buf); + + if (i == I387_FOP_REGNUM) + { + /* The opcode occupies only 11 bits. Make sure we + don't touch the other bits. */ + buf[1] &= ((1 << 3) - 1); + buf[1] |= ((FSAVE_ADDR (regs, i))[1] & ~((1 << 3) - 1)); + } + memcpy (FSAVE_ADDR (regs, i), buf, 2); + } + else + regcache_raw_collect (regcache, i, FSAVE_ADDR (regs, i)); + } +#undef I387_ST0_REGNUM +} + +/* Fill register REGNUM (if it is a floating-point register) in *FSAVE + with the value in GDB's register cache. If REGNUM is -1, do this + for all registers. This function doesn't touch any of the reserved + bits in *FSAVE. */ + +void +i387_fill_fsave (void *fsave, int regnum) +{ + i387_collect_fsave (current_regcache, regnum, fsave); +} + + +/* At fxsave_offset[REGNUM] you'll find the offset to the location in + the data structure used by the "fxsave" instruction where GDB + register REGNUM is stored. */ + +static int fxsave_offset[] = +{ + 32, /* %st(0) through ... */ + 48, + 64, + 80, + 96, + 112, + 128, + 144, /* ... %st(7) (80 bits each). */ + 0, /* `fctrl' (16 bits). */ + 2, /* `fstat' (16 bits). */ + 4, /* `ftag' (16 bits). */ + 12, /* `fiseg' (16 bits). */ + 8, /* `fioff'. */ + 20, /* `foseg' (16 bits). */ + 16, /* `fooff'. */ + 6, /* `fop' (bottom 11 bits). */ + 160 + 0 * 16, /* %xmm0 through ... */ + 160 + 1 * 16, + 160 + 2 * 16, + 160 + 3 * 16, + 160 + 4 * 16, + 160 + 5 * 16, + 160 + 6 * 16, + 160 + 7 * 16, + 160 + 8 * 16, + 160 + 9 * 16, + 160 + 10 * 16, + 160 + 11 * 16, + 160 + 12 * 16, + 160 + 13 * 16, + 160 + 14 * 16, + 160 + 15 * 16, /* ... %xmm15 (128 bits each). */ +}; + +#define FXSAVE_ADDR(fxsave, regnum) \ + (fxsave + fxsave_offset[regnum - I387_ST0_REGNUM]) + +/* We made an unfortunate choice in putting %mxcsr after the SSE + registers %xmm0-%xmm7 instead of before, since it makes supporting + the registers %xmm8-%xmm15 on AMD64 a bit involved. Therefore we + don't include the offset for %mxcsr here above. */ + +#define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24) + +static int i387_tag (const unsigned char *raw); + + +/* Fill register REGNUM in REGCACHE with the appropriate + floating-point or SSE register value from *FXSAVE. This function + masks off any of the reserved bits in *FXSAVE. */ + +void +i387_supply_fxsave (struct regcache *regcache, int regnum, const void *fxsave) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); + const char *regs = fxsave; + int i; + + gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); + gdb_assert (tdep->num_xmm_regs > 0); + + /* Define I387_ST0_REGNUM and I387_NUM_XMM_REGS such that we use the + proper definitions for REGCACHE's architecture. */ + +#define I387_ST0_REGNUM tdep->st0_regnum +#define I387_NUM_XMM_REGS tdep->num_xmm_regs + + for (i = I387_ST0_REGNUM; i < I387_MXCSR_REGNUM; i++) + if (regnum == -1 || regnum == i) + { + if (regs == NULL) + { + regcache_raw_supply (regcache, i, NULL); + continue; + } + + /* Most of the FPU control registers occupy only 16 bits in + the fxsave area. Give those a special treatment. */ + if (i >= I387_FCTRL_REGNUM && i < I387_XMM0_REGNUM + && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM) + { + unsigned char val[4]; + + memcpy (val, FXSAVE_ADDR (regs, i), 2); + val[2] = val[3] = 0; + if (i == I387_FOP_REGNUM) + val[1] &= ((1 << 3) - 1); + else if (i== I387_FTAG_REGNUM) + { + /* The fxsave area contains a simplified version of + the tag word. We have to look at the actual 80-bit + FP data to recreate the traditional i387 tag word. */ + + unsigned long ftag = 0; + int fpreg; + int top; + + top = ((FXSAVE_ADDR (regs, I387_FSTAT_REGNUM))[1] >> 3); + top &= 0x7; + + for (fpreg = 7; fpreg >= 0; fpreg--) + { + int tag; + + if (val[0] & (1 << fpreg)) + { + int regnum = (fpreg + 8 - top) % 8 + I387_ST0_REGNUM; + tag = i387_tag (FXSAVE_ADDR (regs, regnum)); + } + else + tag = 3; /* Empty */ + + ftag |= tag << (2 * fpreg); + } + val[0] = ftag & 0xff; + val[1] = (ftag >> 8) & 0xff; + } + regcache_raw_supply (regcache, i, val); + } + else + regcache_raw_supply (regcache, i, FXSAVE_ADDR (regs, i)); + } + + if (regnum == I387_MXCSR_REGNUM || regnum == -1) { - printf ("mask:"); - if (control & 0x0001) printf (" INVALID"); - if (control & 0x0002) printf (" DENORM"); - if (control & 0x0004) printf (" DIVZ"); - if (control & 0x0008) printf (" OVERF"); - if (control & 0x0010) printf (" UNDERF"); - if (control & 0x0020) printf (" LOS"); - printf (";"); + if (regs == NULL) + regcache_raw_supply (regcache, I387_MXCSR_REGNUM, NULL); + else + regcache_raw_supply (regcache, I387_MXCSR_REGNUM, + FXSAVE_MXCSR_ADDR (regs)); } - printf ("\n"); - if (control & 0xe080) printf ("warning: reserved bits on: %s\n", - local_hex_string(control & 0xe080)); + +#undef I387_ST0_REGNUM +#undef I387_NUM_XMM_REGS +} + +/* Fill register REGNUM (if it is a floating-point or SSE register) in + *FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for + all registers. This function doesn't touch any of the reserved + bits in *FXSAVE. */ + +void +i387_collect_fxsave (const struct regcache *regcache, int regnum, void *fxsave) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + char *regs = fxsave; + int i; + + gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM); + gdb_assert (tdep->num_xmm_regs > 0); + + /* Define I387_ST0_REGNUM and I387_NUM_XMM_REGS such that we use the + proper definitions for REGCACHE's architecture. */ + +#define I387_ST0_REGNUM tdep->st0_regnum +#define I387_NUM_XMM_REGS tdep->num_xmm_regs + + for (i = I387_ST0_REGNUM; i < I387_MXCSR_REGNUM; i++) + if (regnum == -1 || regnum == i) + { + /* Most of the FPU control registers occupy only 16 bits in + the fxsave area. Give those a special treatment. */ + if (i >= I387_FCTRL_REGNUM && i < I387_XMM0_REGNUM + && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM) + { + unsigned char buf[4]; + + regcache_raw_collect (regcache, i, buf); + + if (i == I387_FOP_REGNUM) + { + /* The opcode occupies only 11 bits. Make sure we + don't touch the other bits. */ + buf[1] &= ((1 << 3) - 1); + buf[1] |= ((FXSAVE_ADDR (regs, i))[1] & ~((1 << 3) - 1)); + } + else if (i == I387_FTAG_REGNUM) + { + /* Converting back is much easier. */ + + unsigned short ftag; + int fpreg; + + ftag = (buf[1] << 8) | buf[0]; + buf[0] = 0; + buf[1] = 0; + + for (fpreg = 7; fpreg >= 0; fpreg--) + { + int tag = (ftag >> (fpreg * 2)) & 3; + + if (tag != 3) + buf[0] |= (1 << fpreg); + } + } + memcpy (FXSAVE_ADDR (regs, i), buf, 2); + } + else + regcache_raw_collect (regcache, i, FXSAVE_ADDR (regs, i)); + } + + if (regnum == I387_MXCSR_REGNUM || regnum == -1) + regcache_raw_collect (regcache, I387_MXCSR_REGNUM, + FXSAVE_MXCSR_ADDR (regs)); + +#undef I387_ST0_REGNUM +#undef I387_NUM_XMM_REGS } +/* Fill register REGNUM (if it is a floating-point or SSE register) in + *FXSAVE with the value in GDB's register cache. If REGNUM is -1, do + this for all registers. This function doesn't touch any of the + reserved bits in *FXSAVE. */ + void -print_387_status_word (status) - unsigned short status; +i387_fill_fxsave (void *fxsave, int regnum) { - printf ("status %s: ", local_hex_string (status)); - if (status & 0xff) + i387_collect_fxsave (current_regcache, regnum, fxsave); +} + +/* Recreate the FTW (tag word) valid bits from the 80-bit FP data in + *RAW. */ + +static int +i387_tag (const unsigned char *raw) +{ + int integer; + unsigned int exponent; + unsigned long fraction[2]; + + integer = raw[7] & 0x80; + exponent = (((raw[9] & 0x7f) << 8) | raw[8]); + fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); + fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) + | (raw[5] << 8) | raw[4]); + + if (exponent == 0x7fff) + { + /* Special. */ + return (2); + } + else if (exponent == 0x0000) + { + if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) + { + /* Zero. */ + return (1); + } + else + { + /* Special. */ + return (2); + } + } + else { - printf ("exceptions:"); - if (status & 0x0001) printf (" INVALID"); - if (status & 0x0002) printf (" DENORM"); - if (status & 0x0004) printf (" DIVZ"); - if (status & 0x0008) printf (" OVERF"); - if (status & 0x0010) printf (" UNDERF"); - if (status & 0x0020) printf (" LOS"); - if (status & 0x0040) printf (" FPSTACK"); - printf ("; "); + if (integer) + { + /* Valid. */ + return (0); + } + else + { + /* Special. */ + return (2); + } } - printf ("flags: %d%d%d%d; ", - (status & 0x4000) != 0, - (status & 0x0400) != 0, - (status & 0x0200) != 0, - (status & 0x0100) != 0); - - printf ("top %d\n", (status >> 11) & 7); +} + +/* Prepare the FPU stack in REGCACHE for a function return. */ + +void +i387_return_value (struct gdbarch *gdbarch, struct regcache *regcache) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + ULONGEST fstat; + + /* Define I387_ST0_REGNUM such that we use the proper + definitions for the architecture. */ +#define I387_ST0_REGNUM tdep->st0_regnum + + /* Set the top of the floating-point register stack to 7. The + actual value doesn't really matter, but 7 is what a normal + function return would end up with if the program started out with + a freshly initialized FPU. */ + regcache_raw_read_unsigned (regcache, I387_FSTAT_REGNUM, &fstat); + fstat |= (7 << 11); + regcache_raw_write_unsigned (regcache, I387_FSTAT_REGNUM, fstat); + + /* Mark %st(1) through %st(7) as empty. Since we set the top of the + floating-point register stack to 7, the appropriate value for the + tag word is 0x3fff. */ + regcache_raw_write_unsigned (regcache, I387_FTAG_REGNUM, 0x3fff); + +#undef I387_ST0_REGNUM }