diff options
Diffstat (limited to 'contrib/gdb/gdb/i387-tdep.c')
| -rw-r--r-- | contrib/gdb/gdb/i387-tdep.c | 840 |
1 files changed, 612 insertions, 228 deletions
diff --git a/contrib/gdb/gdb/i387-tdep.c b/contrib/gdb/gdb/i387-tdep.c index 2a6f77c..21386fb 100644 --- a/contrib/gdb/gdb/i387-tdep.c +++ b/contrib/gdb/gdb/i387-tdep.c @@ -1,6 +1,7 @@ /* Intel 387 floating point stuff. - Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001 - Free Software Foundation, Inc. + + Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, + 2001, 2002, 2003, 2004 Free Software Foundation, Inc. This file is part of GDB. @@ -20,147 +21,28 @@ Boston, MA 02111-1307, USA. */ #include "defs.h" +#include "doublest.h" +#include "floatformat.h" #include "frame.h" +#include "gdbcore.h" #include "inferior.h" #include "language.h" -#include "value.h" -#include "gdbcore.h" -#include "floatformat.h" #include "regcache.h" +#include "value.h" + #include "gdb_assert.h" -#include "doublest.h" +#include "gdb_string.h" #include "i386-tdep.h" +#include "i387-tdep.h" -/* FIXME: Eliminate the next two functions when we have the time to - change all the callers. */ - -void i387_to_double (char *from, char *to); -void double_to_i387 (char *from, char *to); - -void -i387_to_double (char *from, char *to) -{ - floatformat_to_double (&floatformat_i387_ext, from, (double *) to); -} - -void -double_to_i387 (char *from, char *to) -{ - floatformat_from_double (&floatformat_i387_ext, (double *) from, to); -} - - -/* FIXME: The functions on this page are used by the old `info float' - implementations that a few of the i386 targets provide. These - functions should be removed if all of these have been converted to - use the generic implementation based on the new register file - layout. */ - -static void print_387_control_bits (unsigned int control); -static void print_387_status_bits (unsigned int status); - -static void -print_387_control_bits (unsigned int control) -{ - switch ((control >> 8) & 3) - { - case 0: - puts_unfiltered (" 24 bit; "); - break; - case 1: - puts_unfiltered (" (bad); "); - break; - case 2: - puts_unfiltered (" 53 bit; "); - break; - case 3: - puts_unfiltered (" 64 bit; "); - break; - } - switch ((control >> 10) & 3) - { - case 0: - puts_unfiltered ("NEAR; "); - break; - case 1: - puts_unfiltered ("DOWN; "); - break; - case 2: - puts_unfiltered ("UP; "); - break; - case 3: - puts_unfiltered ("CHOP; "); - break; - } - if (control & 0x3f) - { - puts_unfiltered ("mask"); - if (control & 0x0001) - puts_unfiltered (" INVAL"); - if (control & 0x0002) - puts_unfiltered (" DENOR"); - if (control & 0x0004) - puts_unfiltered (" DIVZ"); - if (control & 0x0008) - puts_unfiltered (" OVERF"); - if (control & 0x0010) - puts_unfiltered (" UNDER"); - if (control & 0x0020) - puts_unfiltered (" LOS"); - puts_unfiltered (";"); - } - - if (control & 0xe080) - warning ("\nreserved bits on: %s", - local_hex_string (control & 0xe080)); -} - -void -print_387_control_word (unsigned int control) -{ - printf_filtered ("control %s:", local_hex_string(control & 0xffff)); - print_387_control_bits (control); - puts_unfiltered ("\n"); -} - -static void -print_387_status_bits (unsigned int status) -{ - printf_unfiltered (" flags %d%d%d%d; ", - (status & 0x4000) != 0, - (status & 0x0400) != 0, - (status & 0x0200) != 0, - (status & 0x0100) != 0); - printf_unfiltered ("top %d; ", (status >> 11) & 7); - if (status & 0xff) - { - puts_unfiltered ("excep"); - if (status & 0x0001) puts_unfiltered (" INVAL"); - if (status & 0x0002) puts_unfiltered (" DENOR"); - if (status & 0x0004) puts_unfiltered (" DIVZ"); - if (status & 0x0008) puts_unfiltered (" OVERF"); - if (status & 0x0010) puts_unfiltered (" UNDER"); - if (status & 0x0020) puts_unfiltered (" LOS"); - if (status & 0x0040) puts_unfiltered (" STACK"); - } -} - -void -print_387_status_word (unsigned int status) -{ - printf_filtered ("status %s:", local_hex_string (status & 0xffff)); - print_387_status_bits (status); - puts_unfiltered ("\n"); -} - - /* 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) +print_i387_value (char *raw, struct ui_file *file) { DOUBLEST value; @@ -175,15 +57,16 @@ print_i387_value (char *raw) 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 - printf_filtered (" %-+27.19Lg", (long double) value); + fprintf_filtered (file, " %-+27.19Lg", (long double) value); #else - printf_filtered (" %-+27.19g", (double) value); + fprintf_filtered (file, " %-+27.19g", (double) value); #endif } /* Print the classification for the register contents RAW. */ + static void -print_i387_ext (unsigned char *raw) +print_i387_ext (unsigned char *raw, struct ui_file *file) { int sign; int integer; @@ -201,190 +84,691 @@ print_i387_ext (unsigned char *raw) { if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) /* Infinity. */ - printf_filtered (" %cInf", (sign ? '-' : '+')); + fprintf_filtered (file, " %cInf", (sign ? '-' : '+')); else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) /* Real Indefinite (QNaN). */ - puts_unfiltered (" Real Indefinite (QNaN)"); + fputs_unfiltered (" Real Indefinite (QNaN)", file); else if (fraction[1] & 0x40000000) /* QNaN. */ - puts_filtered (" QNaN"); + fputs_filtered (" QNaN", file); else /* SNaN. */ - puts_filtered (" SNaN"); + fputs_filtered (" SNaN", file); } else if (exponent < 0x7fff && exponent > 0x0000 && integer) /* Normal. */ - print_i387_value (raw); + print_i387_value (raw, file); else if (exponent == 0x0000) { /* Denormal or zero. */ - print_i387_value (raw); + print_i387_value (raw, file); if (integer) /* Pseudo-denormal. */ - puts_filtered (" Pseudo-denormal"); + fputs_filtered (" Pseudo-denormal", file); else if (fraction[0] || fraction[1]) /* Denormal. */ - puts_filtered (" Denormal"); + fputs_filtered (" Denormal", file); } else /* Unsupported. */ - puts_filtered (" Unsupported"); + fputs_filtered (" Unsupported", file); } /* Print the status word STATUS. */ + static void -print_i387_status_word (unsigned int status) +print_i387_status_word (unsigned int status, struct ui_file *file) { - printf_filtered ("Status Word: %s", + fprintf_filtered (file, "Status Word: %s", local_hex_string_custom (status, "04")); - puts_filtered (" "); - printf_filtered (" %s", (status & 0x0001) ? "IE" : " "); - printf_filtered (" %s", (status & 0x0002) ? "DE" : " "); - printf_filtered (" %s", (status & 0x0004) ? "ZE" : " "); - printf_filtered (" %s", (status & 0x0008) ? "OE" : " "); - printf_filtered (" %s", (status & 0x0010) ? "UE" : " "); - printf_filtered (" %s", (status & 0x0020) ? "PE" : " "); - puts_filtered (" "); - printf_filtered (" %s", (status & 0x0080) ? "ES" : " "); - puts_filtered (" "); - printf_filtered (" %s", (status & 0x0040) ? "SF" : " "); - puts_filtered (" "); - printf_filtered (" %s", (status & 0x0100) ? "C0" : " "); - printf_filtered (" %s", (status & 0x0200) ? "C1" : " "); - printf_filtered (" %s", (status & 0x0400) ? "C2" : " "); - printf_filtered (" %s", (status & 0x4000) ? "C3" : " "); - - puts_filtered ("\n"); - - printf_filtered (" TOP: %d\n", ((status >> 11) & 7)); + 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) +print_i387_control_word (unsigned int control, struct ui_file *file) { - printf_filtered ("Control Word: %s", + fprintf_filtered (file, "Control Word: %s", local_hex_string_custom (control, "04")); - puts_filtered (" "); - printf_filtered (" %s", (control & 0x0001) ? "IM" : " "); - printf_filtered (" %s", (control & 0x0002) ? "DM" : " "); - printf_filtered (" %s", (control & 0x0004) ? "ZM" : " "); - printf_filtered (" %s", (control & 0x0008) ? "OM" : " "); - printf_filtered (" %s", (control & 0x0010) ? "UM" : " "); - printf_filtered (" %s", (control & 0x0020) ? "PM" : " "); + 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" : " "); - puts_filtered ("\n"); + fputs_filtered ("\n", file); - puts_filtered (" PC: "); + fputs_filtered (" PC: ", file); switch ((control >> 8) & 3) { case 0: - puts_filtered ("Single Precision (24-bits)\n"); + fputs_filtered ("Single Precision (24-bits)\n", file); break; case 1: - puts_filtered ("Reserved\n"); + fputs_filtered ("Reserved\n", file); break; case 2: - puts_filtered ("Double Precision (53-bits)\n"); + fputs_filtered ("Double Precision (53-bits)\n", file); break; case 3: - puts_filtered ("Extended Precision (64-bits)\n"); + fputs_filtered ("Extended Precision (64-bits)\n", file); break; } - puts_filtered (" RC: "); + fputs_filtered (" RC: ", file); switch ((control >> 10) & 3) { case 0: - puts_filtered ("Round to nearest\n"); + fputs_filtered ("Round to nearest\n", file); break; case 1: - puts_filtered ("Round down\n"); + fputs_filtered ("Round down\n", file); break; case 2: - puts_filtered ("Round up\n"); + fputs_filtered ("Round up\n", file); break; case 3: - puts_filtered ("Round toward zero\n"); + fputs_filtered ("Round toward zero\n", file); break; } } -/* Print out the i387 floating poin state. */ +/* 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 -i387_float_info (void) +i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, + struct frame_info *frame, const char *args) { - unsigned int fctrl; - unsigned int fstat; - unsigned int ftag; - unsigned int fiseg; - unsigned int fioff; - unsigned int foseg; - unsigned int fooff; - unsigned int fop; + 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; - fctrl = read_register (FCTRL_REGNUM); - fstat = read_register (FSTAT_REGNUM); - ftag = read_register (FTAG_REGNUM); - fiseg = read_register (FCS_REGNUM); - fioff = read_register (FCOFF_REGNUM); - foseg = read_register (FDS_REGNUM); - fooff = read_register (FDOFF_REGNUM); - fop = read_register (FOP_REGNUM); - + 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[FPU_REG_RAW_SIZE]; + unsigned char raw[I386_MAX_REGISTER_SIZE]; int tag = (ftag >> (fpreg * 2)) & 3; int i; - printf_filtered ("%sR%d: ", fpreg == top ? "=>" : " ", fpreg); + fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg); switch (tag) { case 0: - puts_filtered ("Valid "); + fputs_filtered ("Valid ", file); break; case 1: - puts_filtered ("Zero "); + fputs_filtered ("Zero ", file); break; case 2: - puts_filtered ("Special "); + fputs_filtered ("Special ", file); break; case 3: - puts_filtered ("Empty "); + fputs_filtered ("Empty ", file); break; } - read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw); + get_frame_register (frame, (fpreg + 8 - top) % 8 + I387_ST0_REGNUM, raw); - puts_filtered ("0x"); + fputs_filtered ("0x", file); for (i = 9; i >= 0; i--) - printf_filtered ("%02x", raw[i]); + fprintf_filtered (file, "%02x", raw[i]); if (tag != 3) - print_i387_ext (raw); + 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 +i387_register_to_value (struct frame_info *frame, int regnum, + struct type *type, void *to) +{ + 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) + { + warning ("Cannot convert floating-point register value " + "to non-floating-point type."); + return; + } - puts_filtered ("\n"); + /* 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) + { + warning ("Cannot convert non-floating-point type " + "to floating-point register value."); + return; + } + + /* 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 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) +{ + struct regcache *regcache = current_regcache; + 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 +} + + +/* 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) + { + if (regs == NULL) + regcache_raw_supply (regcache, I387_MXCSR_REGNUM, NULL); + else + regcache_raw_supply (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 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 +i387_fill_fxsave (void *fxsave, int regnum) +{ + 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 + { + if (integer) + { + /* Valid. */ + return (0); + } + else + { + /* Special. */ + return (2); + } } +} + +/* Prepare the FPU stack in REGCACHE for a function return. */ - puts_filtered ("\n"); - - print_i387_status_word (fstat); - print_i387_control_word (fctrl); - printf_filtered ("Tag Word: %s\n", - local_hex_string_custom (ftag, "04")); - printf_filtered ("Instruction Pointer: %s:", - local_hex_string_custom (fiseg, "02")); - printf_filtered ("%s\n", local_hex_string_custom (fioff, "08")); - printf_filtered ("Operand Pointer: %s:", - local_hex_string_custom (foseg, "02")); - printf_filtered ("%s\n", local_hex_string_custom (fooff, "08")); - printf_filtered ("Opcode: %s\n", - local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); +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 } |
