/* Intel 386 target-dependent stuff.
- Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001
- Free Software Foundation, Inc.
+
+ Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
+ 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
This file is part of GDB.
#include "command.h"
#include "arch-utils.h"
#include "regcache.h"
+#include "doublest.h"
+#include "value.h"
+#include "gdb_assert.h"
+
+#include "i386-tdep.h"
+
+/* Names of the registers. The first 10 registers match the register
+ numbering scheme used by GCC for stabs and DWARF. */
+static char *i386_register_names[] =
+{
+ "eax", "ecx", "edx", "ebx",
+ "esp", "ebp", "esi", "edi",
+ "eip", "eflags", "cs", "ss",
+ "ds", "es", "fs", "gs",
+ "st0", "st1", "st2", "st3",
+ "st4", "st5", "st6", "st7",
+ "fctrl", "fstat", "ftag", "fiseg",
+ "fioff", "foseg", "fooff", "fop",
+ "xmm0", "xmm1", "xmm2", "xmm3",
+ "xmm4", "xmm5", "xmm6", "xmm7",
+ "mxcsr"
+};
-/* i386_register_byte[i] is the offset into the register file of the
+/* i386_register_offset[i] is the offset into the register file of the
start of register number i. We initialize this from
- i386_register_raw_size. */
-int i386_register_byte[MAX_NUM_REGS];
+ i386_register_size. */
+static int i386_register_offset[I386_SSE_NUM_REGS];
-/* i386_register_raw_size[i] is the number of bytes of storage in
- GDB's register array occupied by register i. */
-int i386_register_raw_size[MAX_NUM_REGS] = {
+/* i386_register_size[i] is the number of bytes of storage in GDB's
+ register array occupied by register i. */
+static int i386_register_size[I386_SSE_NUM_REGS] = {
4, 4, 4, 4,
4, 4, 4, 4,
4, 4, 4, 4,
4
};
-/* i386_register_virtual_size[i] is the size in bytes of the virtual
- type of register i. */
-int i386_register_virtual_size[MAX_NUM_REGS];
+/* Return the name of register REG. */
+
+const char *
+i386_register_name (int reg)
+{
+ if (reg < 0)
+ return NULL;
+ if (reg >= sizeof (i386_register_names) / sizeof (*i386_register_names))
+ return NULL;
+
+ return i386_register_names[reg];
+}
+
+/* Return the offset into the register array of the start of register
+ number REG. */
+int
+i386_register_byte (int reg)
+{
+ return i386_register_offset[reg];
+}
+
+/* Return the number of bytes of storage in GDB's register array
+ occupied by register REG. */
+
+int
+i386_register_raw_size (int reg)
+{
+ return i386_register_size[reg];
+}
+
+/* Convert stabs register number REG to the appropriate register
+ number used by GDB. */
+
+static int
+i386_stab_reg_to_regnum (int reg)
+{
+ /* This implements what GCC calls the "default" register map. */
+ if (reg >= 0 && reg <= 7)
+ {
+ /* General registers. */
+ return reg;
+ }
+ else if (reg >= 12 && reg <= 19)
+ {
+ /* Floating-point registers. */
+ return reg - 12 + FP0_REGNUM;
+ }
+ else if (reg >= 21 && reg <= 28)
+ {
+ /* SSE registers. */
+ return reg - 21 + XMM0_REGNUM;
+ }
+ else if (reg >= 29 && reg <= 36)
+ {
+ /* MMX registers. */
+ /* FIXME: kettenis/2001-07-28: Should we have the MMX registers
+ as pseudo-registers? */
+ return reg - 29 + FP0_REGNUM;
+ }
+
+ /* This will hopefully provoke a warning. */
+ return NUM_REGS + NUM_PSEUDO_REGS;
+}
+
+/* Convert DWARF register number REG to the appropriate register
+ number used by GDB. */
+
+static int
+i386_dwarf_reg_to_regnum (int reg)
+{
+ /* The DWARF register numbering includes %eip and %eflags, and
+ numbers the floating point registers differently. */
+ if (reg >= 0 && reg <= 9)
+ {
+ /* General registers. */
+ return reg;
+ }
+ else if (reg >= 11 && reg <= 18)
+ {
+ /* Floating-point registers. */
+ return reg - 11 + FP0_REGNUM;
+ }
+ else if (reg >= 21)
+ {
+ /* The SSE and MMX registers have identical numbers as in stabs. */
+ return i386_stab_reg_to_regnum (reg);
+ }
+
+ /* This will hopefully provoke a warning. */
+ return NUM_REGS + NUM_PSEUDO_REGS;
+}
\f
/* This is the variable that is set with "set disassembly-flavor", and
};
static const char *disassembly_flavor = att_flavor;
-/* This is used to keep the bfd arch_info in sync with the disassembly
- flavor. */
-static void set_disassembly_flavor_sfunc (char *, int,
- struct cmd_list_element *);
-static void set_disassembly_flavor (void);
-\f
-
/* Stdio style buffering was used to minimize calls to ptrace, but
this buffering did not take into account that the code section
being accessed may not be an even number of buffers long (even if
return (-1);
}
+/* Return the chain-pointer for FRAME. In the case of the i386, the
+ frame's nominal address is the address of a 4-byte word containing
+ the calling frame's address. */
+
+static CORE_ADDR
+i386_frame_chain (struct frame_info *frame)
+{
+ if (frame->signal_handler_caller)
+ return frame->frame;
+
+ if (! inside_entry_file (frame->pc))
+ return read_memory_unsigned_integer (frame->frame, 4);
+
+ return 0;
+}
+
+/* Determine whether the function invocation represented by FRAME does
+ not have a from on the stack associated with it. If it does not,
+ return non-zero, otherwise return zero. */
+
+int
+i386_frameless_function_invocation (struct frame_info *frame)
+{
+ if (frame->signal_handler_caller)
+ return 0;
+
+ return frameless_look_for_prologue (frame);
+}
+
+/* Return the saved program counter for FRAME. */
+
+static CORE_ADDR
+i386_frame_saved_pc (struct frame_info *frame)
+{
+ if (frame->signal_handler_caller)
+ {
+ CORE_ADDR (*sigtramp_saved_pc) (struct frame_info *);
+ sigtramp_saved_pc = gdbarch_tdep (current_gdbarch)->sigtramp_saved_pc;
+
+ gdb_assert (sigtramp_saved_pc != NULL);
+ return sigtramp_saved_pc (frame);
+ }
+
+ return read_memory_unsigned_integer (frame->frame + 4, 4);
+}
+
+/* Immediately after a function call, return the saved pc. */
+
+static CORE_ADDR
+i386_saved_pc_after_call (struct frame_info *frame)
+{
+ return read_memory_unsigned_integer (read_register (SP_REGNUM), 4);
+}
+
/* Return number of args passed to a frame.
Can return -1, meaning no way to tell. */
/* Return PC of first real instruction. */
-int
-i386_skip_prologue (int pc)
+CORE_ADDR
+i386_skip_prologue (CORE_ADDR pc)
{
unsigned char op;
int i;
return (codestream_tell ());
}
+/* Use the program counter to determine the contents and size of a
+ breakpoint instruction. Return a pointer to a string of bytes that
+ encode a breakpoint instruction, store the length of the string in
+ *LEN and optionally adjust *PC to point to the correct memory
+ location for inserting the breakpoint.
+
+ On the i386 we have a single breakpoint that fits in a single byte
+ and can be inserted anywhere. */
+
+static const unsigned char *
+i386_breakpoint_from_pc (CORE_ADDR *pc, int *len)
+{
+ static unsigned char break_insn[] = { 0xcc }; /* int 3 */
+
+ *len = sizeof (break_insn);
+ return break_insn;
+}
+
void
i386_push_dummy_frame (void)
{
CORE_ADDR sp = read_register (SP_REGNUM);
+ CORE_ADDR fp;
int regnum;
char regbuf[MAX_REGISTER_RAW_SIZE];
sp = push_word (sp, read_register (PC_REGNUM));
sp = push_word (sp, read_register (FP_REGNUM));
- write_register (FP_REGNUM, sp);
+ fp = sp;
for (regnum = 0; regnum < NUM_REGS; regnum++)
{
read_register_gen (regnum, regbuf);
sp = push_bytes (sp, regbuf, REGISTER_RAW_SIZE (regnum));
}
write_register (SP_REGNUM, sp);
+ write_register (FP_REGNUM, fp);
}
+/* The i386 call dummy sequence:
+
+ call 11223344 (32-bit relative)
+ int 3
+
+ It is 8 bytes long. */
+
+static LONGEST i386_call_dummy_words[] =
+{
+ 0x223344e8,
+ 0xcc11
+};
+
/* Insert the (relative) function address into the call sequence
stored at DYMMY. */
void
i386_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
- value_ptr *args, struct type *type, int gcc_p)
+ struct value **args, struct type *type, int gcc_p)
{
int from, to, delta, loc;
}
\f
-#ifdef GET_LONGJMP_TARGET
-
/* Figure out where the longjmp will land. Slurp the args out of the
stack. We expect the first arg to be a pointer to the jmp_buf
- structure from which we extract the pc (JB_PC) that we will land
- at. The pc is copied into PC. This routine returns true on
+ structure from which we extract the address that we will land at.
+ This address is copied into PC. This routine returns true on
success. */
-int
-get_longjmp_target (CORE_ADDR *pc)
+static int
+i386_get_longjmp_target (CORE_ADDR *pc)
{
- char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+ char buf[4];
CORE_ADDR sp, jb_addr;
+ int jb_pc_offset = gdbarch_tdep (current_gdbarch)->jb_pc_offset;
- sp = read_register (SP_REGNUM);
-
- if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */
- buf,
- TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ /* If JB_PC_OFFSET is -1, we have no way to find out where the
+ longjmp will land. */
+ if (jb_pc_offset == -1)
return 0;
- jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
-
- if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
- TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ sp = read_register (SP_REGNUM);
+ if (target_read_memory (sp + 4, buf, 4))
return 0;
- *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ jb_addr = extract_address (buf, 4);
+ if (target_read_memory (jb_addr + jb_pc_offset, buf, 4))
+ return 0;
+ *pc = extract_address (buf, 4);
return 1;
}
-
-#endif /* GET_LONGJMP_TARGET */
\f
CORE_ADDR
-i386_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp,
+i386_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
sp = default_push_arguments (nargs, args, sp, struct_return, struct_addr);
if (TYPE_CODE (type) == TYPE_CODE_FLT)
{
- if (NUM_FREGS == 0)
+ if (FP0_REGNUM == 0)
{
warning ("Cannot find floating-point return value.");
memset (valbuf, 0, len);
return;
}
- /* Floating-point return values can be found in %st(0). */
- if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT
- && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext)
- {
- /* Copy straight over, but take care of the padding. */
- memcpy (valbuf, ®buf[REGISTER_BYTE (FP0_REGNUM)],
- FPU_REG_RAW_SIZE);
- memset (valbuf + FPU_REG_RAW_SIZE, 0, len - FPU_REG_RAW_SIZE);
- }
- else
- {
- /* Convert the extended floating-point number found in
- %st(0) to the desired type. This is probably not exactly
- how it would happen on the target itself, but it is the
- best we can do. */
- DOUBLEST val;
- floatformat_to_doublest (&floatformat_i387_ext,
- ®buf[REGISTER_BYTE (FP0_REGNUM)], &val);
- store_floating (valbuf, TYPE_LENGTH (type), val);
- }
+ /* Floating-point return values can be found in %st(0). Convert
+ its contents to the desired type. This is probably not
+ exactly how it would happen on the target itself, but it is
+ the best we can do. */
+ convert_typed_floating (®buf[REGISTER_BYTE (FP0_REGNUM)],
+ builtin_type_i387_ext, valbuf, type);
}
else
{
if (TYPE_CODE (type) == TYPE_CODE_FLT)
{
- if (NUM_FREGS == 0)
+ unsigned int fstat;
+ char buf[FPU_REG_RAW_SIZE];
+
+ if (FP0_REGNUM == 0)
{
warning ("Cannot set floating-point return value.");
return;
}
- /* Floating-point return values can be found in %st(0). */
- if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT
- && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext)
- {
- /* Copy straight over. */
- write_register_bytes (REGISTER_BYTE (FP0_REGNUM), valbuf,
- FPU_REG_RAW_SIZE);
- }
- else
- {
- char buf[FPU_REG_RAW_SIZE];
- DOUBLEST val;
-
- /* Convert the value found in VALBUF to the extended
- floating point format used by the FPU. This is probably
- not exactly how it would happen on the target itself, but
- it is the best we can do. */
- val = extract_floating (valbuf, TYPE_LENGTH (type));
- floatformat_from_doublest (&floatformat_i387_ext, &val, buf);
- write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf,
- FPU_REG_RAW_SIZE);
- }
+ /* Returning floating-point values is a bit tricky. Apart from
+ storing the return value in %st(0), we have to simulate the
+ state of the FPU at function return point. */
+
+ /* Convert the value found in VALBUF to the extended
+ floating-point format used by the FPU. This is probably
+ not exactly how it would happen on the target itself, but
+ it is the best we can do. */
+ convert_typed_floating (valbuf, type, buf, builtin_type_i387_ext);
+ write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf,
+ FPU_REG_RAW_SIZE);
+
+ /* 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. */
+ fstat = read_register (FSTAT_REGNUM);
+ fstat |= (7 << 11);
+ write_register (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. */
+ write_register (FTAG_REGNUM, 0x3fff);
}
else
{
}
\f
+/* This is the variable that is set with "set struct-convention", and
+ its legitimate values. */
+static const char default_struct_convention[] = "default";
+static const char pcc_struct_convention[] = "pcc";
+static const char reg_struct_convention[] = "reg";
+static const char *valid_conventions[] =
+{
+ default_struct_convention,
+ pcc_struct_convention,
+ reg_struct_convention,
+ NULL
+};
+static const char *struct_convention = default_struct_convention;
+
+static int
+i386_use_struct_convention (int gcc_p, struct type *type)
+{
+ enum struct_return struct_return;
+
+ if (struct_convention == default_struct_convention)
+ struct_return = gdbarch_tdep (current_gdbarch)->struct_return;
+ else if (struct_convention == pcc_struct_convention)
+ struct_return = pcc_struct_return;
+ else
+ struct_return = reg_struct_return;
+
+ return generic_use_struct_convention (struct_return == reg_struct_return,
+ type);
+}
+\f
+
+/* Return the GDB type object for the "standard" data type of data in
+ register REGNUM. Perhaps %esi and %edi should go here, but
+ potentially they could be used for things other than address. */
+
+struct type *
+i386_register_virtual_type (int regnum)
+{
+ if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM)
+ return lookup_pointer_type (builtin_type_void);
+
+ if (IS_FP_REGNUM (regnum))
+ return builtin_type_i387_ext;
+
+ if (IS_SSE_REGNUM (regnum))
+ return builtin_type_vec128i;
+
+ return builtin_type_int;
+}
+
+/* Return true iff register REGNUM's virtual format is different from
+ its raw format. Note that this definition assumes that the host
+ supports IEEE 32-bit floats, since it doesn't say that SSE
+ registers need conversion. Even if we can't find a counterexample,
+ this is still sloppy. */
+
+int
+i386_register_convertible (int regnum)
+{
+ return IS_FP_REGNUM (regnum);
+}
+
/* Convert data from raw format for register REGNUM in buffer FROM to
- virtual format with type TYPE in buffer TO. In principle both
- formats are identical except that the virtual format has two extra
- bytes appended that aren't used. We set these to zero. */
+ virtual format with type TYPE in buffer TO. */
void
i386_register_convert_to_virtual (int regnum, struct type *type,
char *from, char *to)
{
- /* Copy straight over, but take care of the padding. */
- memcpy (to, from, FPU_REG_RAW_SIZE);
- memset (to + FPU_REG_RAW_SIZE, 0, TYPE_LENGTH (type) - FPU_REG_RAW_SIZE);
+ gdb_assert (IS_FP_REGNUM (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.");
+ memset (to, 0, TYPE_LENGTH (type));
+ return;
+ }
+
+ /* Convert to 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, builtin_type_i387_ext, to, type);
}
/* Convert data from virtual format with type TYPE in buffer FROM to
- raw format for register REGNUM in buffer TO. Simply omit the two
- unused bytes. */
+ raw format for register REGNUM in buffer TO. */
void
i386_register_convert_to_raw (struct type *type, int regnum,
char *from, char *to)
{
- memcpy (to, from, FPU_REG_RAW_SIZE);
-}
-\f
-
-#ifdef I386V4_SIGTRAMP_SAVED_PC
-/* Get saved user PC for sigtramp from the pushed ucontext on the
- stack for all three variants of SVR4 sigtramps. */
-
-CORE_ADDR
-i386v4_sigtramp_saved_pc (struct frame_info *frame)
-{
- CORE_ADDR saved_pc_offset = 4;
- char *name = NULL;
+ gdb_assert (IS_FP_REGNUM (regnum));
- find_pc_partial_function (frame->pc, &name, NULL, NULL);
- if (name)
+ /* We only support floating-point values. */
+ if (TYPE_CODE (type) != TYPE_CODE_FLT)
{
- if (STREQ (name, "_sigreturn"))
- saved_pc_offset = 132 + 14 * 4;
- else if (STREQ (name, "_sigacthandler"))
- saved_pc_offset = 80 + 14 * 4;
- else if (STREQ (name, "sigvechandler"))
- saved_pc_offset = 120 + 14 * 4;
+ warning ("Cannot convert non-floating-point type "
+ "to floating-point register value.");
+ memset (to, 0, TYPE_LENGTH (type));
+ return;
}
- if (frame->next)
- return read_memory_integer (frame->next->frame + saved_pc_offset, 4);
- return read_memory_integer (read_register (SP_REGNUM) + saved_pc_offset, 4);
+ /* 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);
}
-#endif /* I386V4_SIGTRAMP_SAVED_PC */
-\f
+\f
#ifdef STATIC_TRANSFORM_NAME
/* SunPRO encodes the static variables. This is not related to C++
}
\f
+/* Return non-zero if PC and NAME show that we are in a signal
+ trampoline. */
+
+static int
+i386_pc_in_sigtramp (CORE_ADDR pc, char *name)
+{
+ return (name && strcmp ("_sigtramp", name) == 0);
+}
+\f
+
/* We have two flavours of disassembly. The machinery on this page
deals with switching between those. */
or intel_flavor. */
internal_error (__FILE__, __LINE__, "failed internal consistency check");
}
+\f
-/* If the disassembly mode is intel, we have to also switch the bfd
- mach_type. This function is run in the set disassembly_flavor
- command, and does that. */
+/* There are a few i386 architecture variants that differ only
+ slightly from the generic i386 target. For now, we don't give them
+ their own source file, but include them here. As a consequence,
+ they'll always be included. */
-static void
-set_disassembly_flavor_sfunc (char *args, int from_tty,
- struct cmd_list_element *c)
+/* System V Release 4 (SVR4). */
+
+static int
+i386_svr4_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
- set_disassembly_flavor ();
+ return (name && (strcmp ("_sigreturn", name) == 0
+ || strcmp ("_sigacthandler", name) == 0
+ || strcmp ("sigvechandler", name) == 0));
}
-static void
-set_disassembly_flavor (void)
+/* Get saved user PC for sigtramp from the pushed ucontext on the
+ stack for all three variants of SVR4 sigtramps. */
+
+CORE_ADDR
+i386_svr4_sigtramp_saved_pc (struct frame_info *frame)
{
- if (disassembly_flavor == att_flavor)
- set_architecture_from_arch_mach (bfd_arch_i386, bfd_mach_i386_i386);
- else if (disassembly_flavor == intel_flavor)
- set_architecture_from_arch_mach (bfd_arch_i386,
- bfd_mach_i386_i386_intel_syntax);
+ CORE_ADDR saved_pc_offset = 4;
+ char *name = NULL;
+
+ find_pc_partial_function (frame->pc, &name, NULL, NULL);
+ if (name)
+ {
+ if (strcmp (name, "_sigreturn") == 0)
+ saved_pc_offset = 132 + 14 * 4;
+ else if (strcmp (name, "_sigacthandler") == 0)
+ saved_pc_offset = 80 + 14 * 4;
+ else if (strcmp (name, "sigvechandler") == 0)
+ saved_pc_offset = 120 + 14 * 4;
+ }
+
+ if (frame->next)
+ return read_memory_integer (frame->next->frame + saved_pc_offset, 4);
+ return read_memory_integer (read_register (SP_REGNUM) + saved_pc_offset, 4);
+}
+\f
+
+/* DJGPP. */
+
+static int
+i386_go32_pc_in_sigtramp (CORE_ADDR pc, char *name)
+{
+ /* DJGPP doesn't have any special frames for signal handlers. */
+ return 0;
+}
+\f
+
+/* Generic ELF. */
+
+void
+i386_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ /* We typically use stabs-in-ELF with the DWARF register numbering. */
+ set_gdbarch_stab_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum);
+}
+
+/* System V Release 4 (SVR4). */
+
+void
+i386_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* System V Release 4 uses ELF. */
+ i386_elf_init_abi (info, gdbarch);
+
+ /* FIXME: kettenis/20020511: Why do we override this function here? */
+ set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid);
+
+ set_gdbarch_pc_in_sigtramp (gdbarch, i386_svr4_pc_in_sigtramp);
+ tdep->sigtramp_saved_pc = i386_svr4_sigtramp_saved_pc;
+
+ tdep->jb_pc_offset = 20;
+}
+
+/* DJGPP. */
+
+void
+i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ set_gdbarch_pc_in_sigtramp (gdbarch, i386_go32_pc_in_sigtramp);
+
+ tdep->jb_pc_offset = 36;
+}
+
+/* NetWare. */
+
+void
+i386_nw_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* FIXME: kettenis/20020511: Why do we override this function here? */
+ set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid);
+
+ tdep->jb_pc_offset = 24;
+}
+\f
+
+struct gdbarch *
+i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch_tdep *tdep;
+ struct gdbarch *gdbarch;
+ enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
+
+ /* Try to determine the OS ABI of the object we're loading. */
+ if (info.abfd != NULL)
+ osabi = gdbarch_lookup_osabi (info.abfd);
+
+ /* Find a candidate among extant architectures. */
+ for (arches = gdbarch_list_lookup_by_info (arches, &info);
+ arches != NULL;
+ arches = gdbarch_list_lookup_by_info (arches->next, &info))
+ {
+ /* Make sure the OS ABI selection matches. */
+ tdep = gdbarch_tdep (arches->gdbarch);
+ if (tdep && tdep->osabi == osabi)
+ return arches->gdbarch;
+ }
+
+ /* Allocate space for the new architecture. */
+ tdep = XMALLOC (struct gdbarch_tdep);
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ tdep->osabi = osabi;
+
+ /* The i386 default settings don't include the SSE registers.
+ FIXME: kettenis/20020614: They do include the FPU registers for
+ now, which probably is not quite right. */
+ tdep->num_xmm_regs = 0;
+
+ tdep->jb_pc_offset = -1;
+ tdep->struct_return = pcc_struct_return;
+ tdep->sigtramp_saved_pc = NULL;
+ tdep->sigtramp_start = 0;
+ tdep->sigtramp_end = 0;
+ tdep->sc_pc_offset = -1;
+
+ /* The format used for `long double' on almost all i386 targets is
+ the i387 extended floating-point format. In fact, of all targets
+ in the GCC 2.95 tree, only OSF/1 does it different, and insists
+ on having a `long double' that's not `long' at all. */
+ set_gdbarch_long_double_format (gdbarch, &floatformat_i387_ext);
+
+ /* Although the i386 extended floating-point has only 80 significant
+ bits, a `long double' actually takes up 96, probably to enforce
+ alignment. */
+ set_gdbarch_long_double_bit (gdbarch, 96);
+
+ /* NOTE: tm-i386aix.h, tm-i386bsd.h, tm-i386os9k.h, tm-ptx.h,
+ tm-symmetry.h currently override this. Sigh. */
+ set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS);
+
+ set_gdbarch_sp_regnum (gdbarch, 4);
+ set_gdbarch_fp_regnum (gdbarch, 5);
+ set_gdbarch_pc_regnum (gdbarch, 8);
+ set_gdbarch_ps_regnum (gdbarch, 9);
+ set_gdbarch_fp0_regnum (gdbarch, 16);
+
+ /* Use the "default" register numbering scheme for stabs and COFF. */
+ set_gdbarch_stab_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum);
+ set_gdbarch_sdb_reg_to_regnum (gdbarch, i386_stab_reg_to_regnum);
+
+ /* Use the DWARF register numbering scheme for DWARF and DWARF 2. */
+ set_gdbarch_dwarf_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, i386_dwarf_reg_to_regnum);
+
+ /* We don't define ECOFF_REG_TO_REGNUM, since ECOFF doesn't seem to
+ be in use on any of the supported i386 targets. */
+
+ set_gdbarch_register_name (gdbarch, i386_register_name);
+ set_gdbarch_register_size (gdbarch, 4);
+ set_gdbarch_register_bytes (gdbarch, I386_SIZEOF_GREGS + I386_SIZEOF_FREGS);
+ set_gdbarch_register_byte (gdbarch, i386_register_byte);
+ set_gdbarch_register_raw_size (gdbarch, i386_register_raw_size);
+ set_gdbarch_max_register_raw_size (gdbarch, 16);
+ set_gdbarch_max_register_virtual_size (gdbarch, 16);
+ set_gdbarch_register_virtual_type (gdbarch, i386_register_virtual_type);
+
+ set_gdbarch_get_longjmp_target (gdbarch, i386_get_longjmp_target);
+
+ set_gdbarch_use_generic_dummy_frames (gdbarch, 0);
+
+ /* Call dummy code. */
+ set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+ set_gdbarch_call_dummy_start_offset (gdbarch, 0);
+ set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 5);
+ set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
+ set_gdbarch_call_dummy_length (gdbarch, 8);
+ set_gdbarch_call_dummy_p (gdbarch, 1);
+ set_gdbarch_call_dummy_words (gdbarch, i386_call_dummy_words);
+ set_gdbarch_sizeof_call_dummy_words (gdbarch,
+ sizeof (i386_call_dummy_words));
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+ set_gdbarch_fix_call_dummy (gdbarch, i386_fix_call_dummy);
+
+ set_gdbarch_register_convertible (gdbarch, i386_register_convertible);
+ set_gdbarch_register_convert_to_virtual (gdbarch,
+ i386_register_convert_to_virtual);
+ set_gdbarch_register_convert_to_raw (gdbarch, i386_register_convert_to_raw);
+
+ set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register);
+ set_gdbarch_push_arguments (gdbarch, i386_push_arguments);
+
+ set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack);
+
+ /* "An argument's size is increased, if necessary, to make it a
+ multiple of [32-bit] words. This may require tail padding,
+ depending on the size of the argument" -- from the x86 ABI. */
+ set_gdbarch_parm_boundary (gdbarch, 32);
+
+ set_gdbarch_deprecated_extract_return_value (gdbarch,
+ i386_extract_return_value);
+ set_gdbarch_push_arguments (gdbarch, i386_push_arguments);
+ set_gdbarch_push_dummy_frame (gdbarch, i386_push_dummy_frame);
+ set_gdbarch_pop_frame (gdbarch, i386_pop_frame);
+ set_gdbarch_store_struct_return (gdbarch, i386_store_struct_return);
+ set_gdbarch_store_return_value (gdbarch, i386_store_return_value);
+ set_gdbarch_deprecated_extract_struct_value_address (gdbarch,
+ i386_extract_struct_value_address);
+ set_gdbarch_use_struct_convention (gdbarch, i386_use_struct_convention);
+
+ set_gdbarch_frame_init_saved_regs (gdbarch, i386_frame_init_saved_regs);
+ set_gdbarch_skip_prologue (gdbarch, i386_skip_prologue);
+
+ /* Stack grows downward. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+ set_gdbarch_breakpoint_from_pc (gdbarch, i386_breakpoint_from_pc);
+ set_gdbarch_decr_pc_after_break (gdbarch, 1);
+ set_gdbarch_function_start_offset (gdbarch, 0);
+
+ /* The following redefines make backtracing through sigtramp work.
+ They manufacture a fake sigtramp frame and obtain the saved pc in
+ sigtramp from the sigcontext structure which is pushed by the
+ kernel on the user stack, along with a pointer to it. */
+
+ set_gdbarch_frame_args_skip (gdbarch, 8);
+ set_gdbarch_frameless_function_invocation (gdbarch,
+ i386_frameless_function_invocation);
+ set_gdbarch_frame_chain (gdbarch, i386_frame_chain);
+ set_gdbarch_frame_chain_valid (gdbarch, file_frame_chain_valid);
+ set_gdbarch_frame_saved_pc (gdbarch, i386_frame_saved_pc);
+ set_gdbarch_frame_args_address (gdbarch, default_frame_address);
+ set_gdbarch_frame_locals_address (gdbarch, default_frame_address);
+ set_gdbarch_saved_pc_after_call (gdbarch, i386_saved_pc_after_call);
+ set_gdbarch_frame_num_args (gdbarch, i386_frame_num_args);
+ set_gdbarch_pc_in_sigtramp (gdbarch, i386_pc_in_sigtramp);
+
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch, osabi);
+
+ return gdbarch;
+}
+
+static enum gdb_osabi
+i386_coff_osabi_sniffer (bfd *abfd)
+{
+ if (strcmp (bfd_get_target (abfd), "coff-go32-exe") == 0
+ || strcmp (bfd_get_target (abfd), "coff-go32") == 0)
+ return GDB_OSABI_GO32;
+
+ return GDB_OSABI_UNKNOWN;
+}
+
+static enum gdb_osabi
+i386_nlm_osabi_sniffer (bfd *abfd)
+{
+ return GDB_OSABI_NETWARE;
}
\f
void
_initialize_i386_tdep (void)
{
+ register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init);
+
/* Initialize the table saying where each register starts in the
register file. */
{
int i, offset;
offset = 0;
- for (i = 0; i < MAX_NUM_REGS; i++)
+ for (i = 0; i < I386_SSE_NUM_REGS; i++)
{
- i386_register_byte[i] = offset;
- offset += i386_register_raw_size[i];
+ i386_register_offset[i] = offset;
+ offset += i386_register_size[i];
}
}
- /* Initialize the table of virtual register sizes. */
- {
- int i;
-
- for (i = 0; i < MAX_NUM_REGS; i++)
- i386_register_virtual_size[i] = TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i));
- }
-
tm_print_insn = gdb_print_insn_i386;
tm_print_insn_info.mach = bfd_lookup_arch (bfd_arch_i386, 0)->mach;
Set the disassembly flavor, the valid values are \"att\" and \"intel\", \
and the default value is \"att\".",
&setlist);
- new_cmd->function.sfunc = set_disassembly_flavor_sfunc;
add_show_from_set (new_cmd, &showlist);
}
- /* Finally, initialize the disassembly flavor to the default given
- in the disassembly_flavor variable. */
- set_disassembly_flavor ();
+ /* Add the variable that controls the convention for returning
+ structs. */
+ {
+ struct cmd_list_element *new_cmd;
+
+ new_cmd = add_set_enum_cmd ("struct-convention", no_class,
+ valid_conventions,
+ &struct_convention, "\
+Set the convention for returning small structs, valid values \
+are \"default\", \"pcc\" and \"reg\", and the default value is \"default\".",
+ &setlist);
+ add_show_from_set (new_cmd, &showlist);
+ }
+
+ gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
+ i386_coff_osabi_sniffer);
+ gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_nlm_flavour,
+ i386_nlm_osabi_sniffer);
+
+ gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_SVR4,
+ i386_svr4_init_abi);
+ gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_GO32,
+ i386_go32_init_abi);
+ gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETWARE,
+ i386_nw_init_abi);
}
projects / deliverable / binutils-gdb.git / blobdiff