From c483c494a07363c8f8d03dabe2a1c595f6bf025a Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Mon, 2 Jun 2003 22:43:31 +0000 Subject: [PATCH] * alpha-tdep.c (alpha_register_type): Change from _virtual_type. (alpha_convert_flt_dbl, alpha_convert_dbl_flt): Remove. (alpha_lds, alpha_sts): New. (alpha_convert_register_p): Change from _register_convertible. (alpha_register_to_value): Change from _convert_to_virtual; restructure and fail for type sizes other than 4 or 8. (alpha_value_to_register): Similarly. (alpha_extract_return_value): Use alpha_sts. (alpha_store_return_value): Use alpha_lds. (alpha_gdbarch_init): Update hooks. --- gdb/ChangeLog | 13 +++++ gdb/alpha-tdep.c | 135 +++++++++++++++++++++++++---------------------- 2 files changed, 86 insertions(+), 62 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 37a13149ab3..21326c274b4 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,16 @@ +2003-06-02 Richard Henderson + + * alpha-tdep.c (alpha_register_type): Change from _virtual_type. + (alpha_convert_flt_dbl, alpha_convert_dbl_flt): Remove. + (alpha_lds, alpha_sts): New. + (alpha_convert_register_p): Change from _register_convertible. + (alpha_register_to_value): Change from _convert_to_virtual; + restructure and fail for type sizes other than 4 or 8. + (alpha_value_to_register): Similarly. + (alpha_extract_return_value): Use alpha_sts. + (alpha_store_return_value): Use alpha_lds. + (alpha_gdbarch_init): Update hooks. + 2003-06-02 Richard Henderson * alpha-tdep.c (alpha_register_virtual_type): Use alpha-specific diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c index 50d5dea4bec..6d9c58d4e5d 100644 --- a/gdb/alpha-tdep.c +++ b/gdb/alpha-tdep.c @@ -80,14 +80,8 @@ alpha_cannot_store_register (int regno) return regno == ALPHA_ZERO_REGNUM; } -static int -alpha_register_convertible (int regno) -{ - return (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31); -} - static struct type * -alpha_register_virtual_type (int regno) +alpha_register_type (struct gdbarch *gdbarch, int regno) { if (regno == ALPHA_SP_REGNUM || regno == ALPHA_GP_REGNUM) return builtin_type_void_data_ptr; @@ -153,73 +147,91 @@ alpha_register_virtual_size (int regno) return 8; } +/* The following represents exactly the conversion performed by + the LDS instruction. This applies to both single-precision + floating point and 32-bit integers. */ + +static void +alpha_lds (void *out, const void *in) +{ + ULONGEST mem = extract_unsigned_integer (in, 4); + ULONGEST frac = (mem >> 0) & 0x7fffff; + ULONGEST sign = (mem >> 31) & 1; + ULONGEST exp_msb = (mem >> 30) & 1; + ULONGEST exp_low = (mem >> 23) & 0x7f; + ULONGEST exp, reg; + + exp = (exp_msb << 10) | exp_low; + if (exp_msb) + { + if (exp_low == 0x7f) + exp = 0x7ff; + } + else + { + if (exp_low != 0x00) + exp |= 0x380; + } + + reg = (sign << 63) | (exp << 52) | (frac << 29); + store_unsigned_integer (out, 8, reg); +} + +/* Similarly, this represents exactly the conversion performed by + the STS instruction. */ + +static inline void +alpha_sts (void *out, const void *in) +{ + ULONGEST reg, mem; + + reg = extract_unsigned_integer (in, 8); + mem = ((reg >> 32) & 0xc0000000) | ((reg >> 29) & 0x3fffffff); + store_unsigned_integer (out, 4, mem); +} + /* The alpha needs a conversion between register and memory format if the register is a floating point register and memory format is float, as the register format must be double or memory format is an integer with 4 bytes or less, as the representation of integers in floating point registers is different. */ -static void -alpha_convert_flt_dbl (void *out, const void *in) -{ - DOUBLEST d = extract_typed_floating (in, builtin_type_ieee_single_little); - store_typed_floating (out, builtin_type_ieee_double_little, d); -} - -static void -alpha_convert_dbl_flt (void *out, const void *in) +static int +alpha_convert_register_p (int regno) { - DOUBLEST d = extract_typed_floating (in, builtin_type_ieee_double_little); - store_typed_floating (out, builtin_type_ieee_single_little, d); + return (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31); } static void -alpha_register_convert_to_virtual (int regnum, struct type *valtype, - char *raw_buffer, char *virtual_buffer) +alpha_register_to_value (int regnum, struct type *valtype, char *in, char *out) { - if (TYPE_LENGTH (valtype) >= ALPHA_REGISTER_SIZE) + switch (TYPE_LENGTH (valtype)) { - memcpy (virtual_buffer, raw_buffer, ALPHA_REGISTER_SIZE); - return; - } - - /* Note that everything below is less than 8 bytes long. */ - - if (TYPE_CODE (valtype) == TYPE_CODE_FLT) - alpha_convert_dbl_flt (virtual_buffer, raw_buffer); - else if (TYPE_CODE (valtype) == TYPE_CODE_INT) - { - ULONGEST l; - l = extract_unsigned_integer (raw_buffer, ALPHA_REGISTER_SIZE); - l = ((l >> 32) & 0xc0000000) | ((l >> 29) & 0x3fffffff); - store_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype), l); + case 4: + alpha_sts (out, in); + break; + case 8: + memcpy (out, in, 8); + break; + default: + error ("Cannot retrieve value from floating point register"); } - else - error ("Cannot retrieve value from floating point register"); } static void -alpha_register_convert_to_raw (struct type *valtype, int regnum, - char *virtual_buffer, char *raw_buffer) +alpha_value_to_register (struct type *valtype, int regnum, char *in, char *out) { - if (TYPE_LENGTH (valtype) >= ALPHA_REGISTER_SIZE) + switch (TYPE_LENGTH (valtype)) { - memcpy (raw_buffer, virtual_buffer, ALPHA_REGISTER_SIZE); - return; - } - - /* Note that everything below is less than 8 bytes long. */ - - if (TYPE_CODE (valtype) == TYPE_CODE_FLT) - alpha_convert_flt_dbl (raw_buffer, virtual_buffer); - else if (TYPE_CODE (valtype) == TYPE_CODE_INT) - { - ULONGEST l = unpack_long (valtype, virtual_buffer); - l = ((l & 0xc0000000) << 32) | ((l & 0x3fffffff) << 29); - store_unsigned_integer (raw_buffer, ALPHA_REGISTER_SIZE, l); + case 4: + alpha_lds (out, in); + break; + case 8: + memcpy (out, in, 8); + break; + default: + error ("Cannot store value in floating point register"); } - else - error ("Cannot store value in floating point register"); } @@ -425,7 +437,7 @@ alpha_extract_return_value (struct type *valtype, struct regcache *regcache, { case 4: regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, raw_buffer); - alpha_convert_dbl_flt (valbuf, raw_buffer); + alpha_sts (valbuf, raw_buffer); break; case 8: @@ -502,7 +514,7 @@ alpha_store_return_value (struct type *valtype, struct regcache *regcache, switch (length) { case 4: - alpha_convert_flt_dbl (raw_buffer, valbuf); + alpha_lds (raw_buffer, valbuf); regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, raw_buffer); break; @@ -1497,15 +1509,14 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_register_byte (gdbarch, alpha_register_byte); set_gdbarch_register_raw_size (gdbarch, alpha_register_raw_size); set_gdbarch_register_virtual_size (gdbarch, alpha_register_virtual_size); - set_gdbarch_register_virtual_type (gdbarch, alpha_register_virtual_type); + set_gdbarch_register_type (gdbarch, alpha_register_type); set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register); set_gdbarch_cannot_store_register (gdbarch, alpha_cannot_store_register); - set_gdbarch_register_convertible (gdbarch, alpha_register_convertible); - set_gdbarch_register_convert_to_virtual (gdbarch, - alpha_register_convert_to_virtual); - set_gdbarch_register_convert_to_raw (gdbarch, alpha_register_convert_to_raw); + set_gdbarch_convert_register_p (gdbarch, alpha_convert_register_p); + set_gdbarch_register_to_value (gdbarch, alpha_register_to_value); + set_gdbarch_value_to_register (gdbarch, alpha_value_to_register); set_gdbarch_register_reggroup_p (gdbarch, alpha_register_reggroup_p); -- 2.30.2