gcc/config/m68k/netbsd-elf.h - gcc - Git at Google

 /* Definitions of target machine for GNU compiler,
    for m68k (including m68010) NetBSD platforms using the
    ELF object format.
    Copyright (C) 2002-2022 Free Software Foundation, Inc.
    Contributed by Wasabi Systems. Inc.

    This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
    and <m68k/linux.h>.

 This file is part of GCC.

 GCC 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 3, or (at your option)
 any later version.

 GCC 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 GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */

 #define TARGET_OS_CPP_BUILTINS()		\
   do						\
     {						\
       NETBSD_OS_CPP_BUILTINS_ELF();		\
       builtin_define ("__m68k__");		\
       builtin_define ("__SVR4_ABI__");		\
       builtin_define ("__motorola__");		\
       if (TARGET_HARD_FLOAT)			\
 	builtin_define ("__HAVE_FPU__");	\
     }						\
   while (0)

 /* Don't try using XFmode on the 68010.  */
 #undef LONG_DOUBLE_TYPE_SIZE
 #define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)

 #undef SUBTARGET_EXTRA_SPECS
 #define SUBTARGET_EXTRA_SPECS \
   { "netbsd_entry_point",   NETBSD_ENTRY_POINT },


 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
    deal with the GCC option '-posix', as well as an indication as to
    whether or not use of the FPU is allowed.  */

 #undef CPP_SPEC
 #define CPP_SPEC NETBSD_CPP_SPEC


 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets.  We need
    to pass PIC code generation options.  */

 #undef ASM_SPEC
 #define ASM_SPEC \
   "%(asm_cpu_spec) %{" FPIE1_OR_FPIC1_SPEC ":-k} %{" FPIE2_OR_FPIC2_SPEC ":-k -K}"

 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.  */

 #undef LINK_SPEC
 #define LINK_SPEC NETBSD_LINK_SPEC_ELF

 #define NETBSD_ENTRY_POINT "_start"

 /* Output assembler code to FILE to increment profiler label # LABELNO
    for profiling a function only.  */

 #undef FUNCTION_PROFILER
 #define FUNCTION_PROFILER(FILE, LABELNO)				\
 do									\
   {									\
     asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));	\
     if (flag_pic)							\
       fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");			\
     else								\
       fprintf (FILE, "\tjbsr __mcount\n");				\
   }									\
 while (0)


 /* Make gcc agree with <machine/ansi.h>  */

 #undef SIZE_TYPE
 #define SIZE_TYPE "unsigned int"

 #undef PTRDIFF_TYPE
 #define PTRDIFF_TYPE "int"


 /* XXX
    Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
    file directly, because it has a lot of baggage we don't want.  */


 /* The prefix for register names.  Note that REGISTER_NAMES
    is supposed to include this prefix.  Also note that this is NOT an
    fprintf format string, it is a literal string.  */

 #undef REGISTER_PREFIX
 #define REGISTER_PREFIX "%"


 /* The prefix for local (compiler generated) lables.
    These labels will not appear in the symbol table.  */

 #undef LOCAL_LABEL_PREFIX
 #define LOCAL_LABEL_PREFIX "."


 /* The prefix to add to user-visible assembler symbols.  */

 #undef USER_LABEL_PREFIX
 #define USER_LABEL_PREFIX ""


 #undef ASM_COMMENT_START
 #define ASM_COMMENT_START "|"


 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
    keep switch tables in the text section.  */

 #undef JUMP_TABLES_IN_TEXT_SECTION
 #define JUMP_TABLES_IN_TEXT_SECTION 1


 /* Use the default action for outputting the case label.  */
 #undef ASM_OUTPUT_CASE_LABEL
 #define ASM_RETURN_CASE_JUMP				\
   do {							\
     if (TARGET_COLDFIRE)				\
       {							\
 	if (ADDRESS_REG_P (operands[0]))		\
 	  return "jmp %%pc@(2,%0:l)";			\
 	else if (TARGET_LONG_JUMP_TABLE_OFFSETS)	\
 	  return "jmp %%pc@(2,%0:l)";			\
 	else						\
 	  return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";	\
       }							\
     else if (TARGET_LONG_JUMP_TABLE_OFFSETS)		\
       return "jmp %%pc@(2,%0:l)";			\
     else						\
       return "jmp %%pc@(2,%0:w)";			\
   } while (0)


 /* This is how to output an assembler line that says to advance the
    location counter to a multiple of 2**LOG bytes.  */

 #undef ASM_OUTPUT_ALIGN
 #define ASM_OUTPUT_ALIGN(FILE,LOG)					\
 do									\
   {									\
     if ((LOG) > 0)							\
       fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));		\
   }									\
 while (0)


 /* If defined, a C expression whose value is a string containing the
    assembler operation to identify the following data as uninitialized global
    data.  */

 #define BSS_SECTION_ASM_OP	".section\t.bss"


 #undef ASM_OUTPUT_ALIGNED_BSS
 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)		\
   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)


 #undef ASM_OUTPUT_COMMON
 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)			\
 ( fputs (".comm ", (FILE)),						\
   assemble_name ((FILE), (NAME)),					\
   fprintf ((FILE), ",%u\n", (int)(SIZE)))

 #undef ASM_OUTPUT_LOCAL
 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)			\
 ( fputs (".lcomm ", (FILE)),						\
   assemble_name ((FILE), (NAME)),					\
   fprintf ((FILE), ",%u\n", (int)(SIZE)))


 /* XXX
    This is the end of the chunk lifted from m68kelf.h  */


 /* XXX
    The following chunk is more or less lifted from m68kv4.h.
    We'd like to just #include that file, but it has not yet
    been converted to the new include style.

    Should there be a m68kv4-abi.h ??  */


 /* Register in which address to store a structure value is passed to a
    function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */

 #undef M68K_STRUCT_VALUE_REGNUM
 #define M68K_STRUCT_VALUE_REGNUM A0_REG


 /* Register in which static-chain is passed to a function.  The
    default isn m68k.h is a0, but that is already the struct value
    regnum.  Make it a1 instead.  */

 #undef STATIC_CHAIN_REGNUM
 #define STATIC_CHAIN_REGNUM A1_REG
 #undef M68K_STATIC_CHAIN_REG_NAME
 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"


 /* Now to renumber registers for gdb.
    We use the Sun-3 convention, which is:
    floating point registers have numbers 18 to 25, not
    16 to 23 as they do in the compiler.  */

 #undef DEBUGGER_REGNO
 #define DEBUGGER_REGNO(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)


 /* 1 if N is a possible register number for a function value.  For
    m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
    pointer, or floating types, respectively.  Reject fp0 if not using
    a 68881 coprocessor.  */

 #undef FUNCTION_VALUE_REGNO_P
 #define FUNCTION_VALUE_REGNO_P(N)					\
   ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))


 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
    more than one register.  */

 #undef NEEDS_UNTYPED_CALL
 #define NEEDS_UNTYPED_CALL 1


 /* Define how to generate (in the callee) the output value of a
    function and how to find (in the caller) the value returned by a
    function.  VALTYPE is the data type of the value (as a tree).  If
    the precise function being called is known, FUNC is its
    FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
    result in d0, a0, or fp0 as appropriate.  */

 #undef FUNCTION_VALUE
 #define FUNCTION_VALUE(VALTYPE, FUNC)					\
   m68k_function_value (VALTYPE, FUNC)


 /* Define how to find the value returned by a library function
    assuming the value has mode MODE.
    For m68k/SVR4 look for integer values in d0, pointer values in d0
    (returned in both d0 and a0), and floating values in fp0.  */

 #undef LIBCALL_VALUE
 #define LIBCALL_VALUE(MODE)						\
   m68k_libcall_value (MODE)


 /* Boundary (in *bits*) on which stack pointer should be aligned.
    The m68k/SVR4 convention is to keep the stack pointer longword aligned.  */

 #undef STACK_BOUNDARY
 #define STACK_BOUNDARY 32


 /* Alignment of field after `int : 0' in a structure.
    For m68k/SVR4, this is the next longword boundary.  */

 #undef EMPTY_FIELD_BOUNDARY
 #define EMPTY_FIELD_BOUNDARY 32


 /* No data type wants to be aligned rounder than this.
    For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
    boundaries */

 #undef BIGGEST_ALIGNMENT
 #define BIGGEST_ALIGNMENT 64


 /* The svr4 ABI for the m68k says that records and unions are returned
    in memory.  */

 #undef DEFAULT_PCC_STRUCT_RETURN
 #define DEFAULT_PCC_STRUCT_RETURN 1

 /* XXX
    This is the end of the chunk lifted from m68kv4.h  */
	/* Definitions of target machine for GNU compiler,
	for m68k (including m68010) NetBSD platforms using the
	ELF object format.
	Copyright (C) 2002-2022 Free Software Foundation, Inc.
	Contributed by Wasabi Systems. Inc.

	This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
	and <m68k/linux.h>.

	This file is part of GCC.

	GCC 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 3, or (at your option)
	any later version.

	GCC 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 GCC; see the file COPYING3. If not see
	<http://www.gnu.org/licenses/>. */

	#define TARGET_OS_CPP_BUILTINS() \
	do \
	{ \
	NETBSD_OS_CPP_BUILTINS_ELF(); \
	builtin_define ("__m68k__"); \
	builtin_define ("__SVR4_ABI__"); \
	builtin_define ("__motorola__"); \
	if (TARGET_HARD_FLOAT) \
	builtin_define ("__HAVE_FPU__"); \
	} \
	while (0)

	/* Don't try using XFmode on the 68010. */
	#undef LONG_DOUBLE_TYPE_SIZE
	#define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)

	#undef SUBTARGET_EXTRA_SPECS
	#define SUBTARGET_EXTRA_SPECS \
	{ "netbsd_entry_point", NETBSD_ENTRY_POINT },


	/* Provide a CPP_SPEC appropriate for NetBSD m68k targets. Currently we
	deal with the GCC option '-posix', as well as an indication as to
	whether or not use of the FPU is allowed. */

	#undef CPP_SPEC
	#define CPP_SPEC NETBSD_CPP_SPEC


	/* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets. We need
	to pass PIC code generation options. */

	#undef ASM_SPEC
	#define ASM_SPEC \
	"%(asm_cpu_spec) %{" FPIE1_OR_FPIC1_SPEC ":-k} %{" FPIE2_OR_FPIC2_SPEC ":-k -K}"

	/* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target. */

	#undef LINK_SPEC
	#define LINK_SPEC NETBSD_LINK_SPEC_ELF

	#define NETBSD_ENTRY_POINT "_start"

	/* Output assembler code to FILE to increment profiler label # LABELNO
	for profiling a function only. */

	#undef FUNCTION_PROFILER
	#define FUNCTION_PROFILER(FILE, LABELNO) \
	do \
	{ \
	asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
	if (flag_pic) \
	fprintf (FILE, "\tbsr.l __mcount@PLTPC\n"); \
	else \
	fprintf (FILE, "\tjbsr __mcount\n"); \
	} \
	while (0)


	/* Make gcc agree with <machine/ansi.h> */

	#undef SIZE_TYPE
	#define SIZE_TYPE "unsigned int"

	#undef PTRDIFF_TYPE
	#define PTRDIFF_TYPE "int"


	/* XXX
	Here is a bunch of stuff lifted from m68kelf.h. We don't use that
	file directly, because it has a lot of baggage we don't want. */


	/* The prefix for register names. Note that REGISTER_NAMES
	is supposed to include this prefix. Also note that this is NOT an
	fprintf format string, it is a literal string. */

	#undef REGISTER_PREFIX
	#define REGISTER_PREFIX "%"


	/* The prefix for local (compiler generated) lables.
	These labels will not appear in the symbol table. */

	#undef LOCAL_LABEL_PREFIX
	#define LOCAL_LABEL_PREFIX "."


	/* The prefix to add to user-visible assembler symbols. */

	#undef USER_LABEL_PREFIX
	#define USER_LABEL_PREFIX ""


	#undef ASM_COMMENT_START
	#define ASM_COMMENT_START "\|"


	/* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
	keep switch tables in the text section. */

	#undef JUMP_TABLES_IN_TEXT_SECTION
	#define JUMP_TABLES_IN_TEXT_SECTION 1


	/* Use the default action for outputting the case label. */
	#undef ASM_OUTPUT_CASE_LABEL
	#define ASM_RETURN_CASE_JUMP \
	do { \
	if (TARGET_COLDFIRE) \
	{ \
	if (ADDRESS_REG_P (operands[0])) \
	return "jmp %%pc@(2,%0:l)"; \
	else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
	return "jmp %%pc@(2,%0:l)"; \
	else \
	return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
	} \
	else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
	return "jmp %%pc@(2,%0:l)"; \
	else \
	return "jmp %%pc@(2,%0:w)"; \
	} while (0)


	/* This is how to output an assembler line that says to advance the
	location counter to a multiple of 2*LOG bytes. /

	#undef ASM_OUTPUT_ALIGN
	#define ASM_OUTPUT_ALIGN(FILE,LOG) \
	do \
	{ \
	if ((LOG) > 0) \
	fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
	} \
	while (0)


	/* If defined, a C expression whose value is a string containing the
	assembler operation to identify the following data as uninitialized global
	data. */

	#define BSS_SECTION_ASM_OP ".section\t.bss"


	#undef ASM_OUTPUT_ALIGNED_BSS
	#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
	asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)


	#undef ASM_OUTPUT_COMMON
	#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
	( fputs (".comm ", (FILE)), \
	assemble_name ((FILE), (NAME)), \
	fprintf ((FILE), ",%u\n", (int)(SIZE)))

	#undef ASM_OUTPUT_LOCAL
	#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
	( fputs (".lcomm ", (FILE)), \
	assemble_name ((FILE), (NAME)), \
	fprintf ((FILE), ",%u\n", (int)(SIZE)))


	/* XXX
	This is the end of the chunk lifted from m68kelf.h */


	/* XXX
	The following chunk is more or less lifted from m68kv4.h.
	We'd like to just #include that file, but it has not yet
	been converted to the new include style.

	Should there be a m68kv4-abi.h ?? */


	/* Register in which address to store a structure value is passed to a
	function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */

	#undef M68K_STRUCT_VALUE_REGNUM
	#define M68K_STRUCT_VALUE_REGNUM A0_REG


	/* Register in which static-chain is passed to a function. The
	default isn m68k.h is a0, but that is already the struct value
	regnum. Make it a1 instead. */

	#undef STATIC_CHAIN_REGNUM
	#define STATIC_CHAIN_REGNUM A1_REG
	#undef M68K_STATIC_CHAIN_REG_NAME
	#define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"


	/* Now to renumber registers for gdb.
	We use the Sun-3 convention, which is:
	floating point registers have numbers 18 to 25, not
	16 to 23 as they do in the compiler. */

	#undef DEBUGGER_REGNO
	#define DEBUGGER_REGNO(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)


	/* 1 if N is a possible register number for a function value. For
	m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
	pointer, or floating types, respectively. Reject fp0 if not using
	a 68881 coprocessor. */

	#undef FUNCTION_VALUE_REGNO_P
	#define FUNCTION_VALUE_REGNO_P(N) \
	((N) == D0_REG \|\| (N) == A0_REG \|\| (TARGET_68881 && (N) == FP0_REG))


	/* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
	more than one register. */

	#undef NEEDS_UNTYPED_CALL
	#define NEEDS_UNTYPED_CALL 1


	/* Define how to generate (in the callee) the output value of a
	function and how to find (in the caller) the value returned by a
	function. VALTYPE is the data type of the value (as a tree). If
	the precise function being called is known, FUNC is its
	FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
	result in d0, a0, or fp0 as appropriate. */

	#undef FUNCTION_VALUE
	#define FUNCTION_VALUE(VALTYPE, FUNC) \
	m68k_function_value (VALTYPE, FUNC)


	/* Define how to find the value returned by a library function
	assuming the value has mode MODE.
	For m68k/SVR4 look for integer values in d0, pointer values in d0
	(returned in both d0 and a0), and floating values in fp0. */

	#undef LIBCALL_VALUE
	#define LIBCALL_VALUE(MODE) \
	m68k_libcall_value (MODE)


	/* Boundary (in bits) on which stack pointer should be aligned.
	The m68k/SVR4 convention is to keep the stack pointer longword aligned. */

	#undef STACK_BOUNDARY
	#define STACK_BOUNDARY 32


	/* Alignment of field after `int : 0' in a structure.
	For m68k/SVR4, this is the next longword boundary. */

	#undef EMPTY_FIELD_BOUNDARY
	#define EMPTY_FIELD_BOUNDARY 32


	/* No data type wants to be aligned rounder than this.
	For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
	boundaries */

	#undef BIGGEST_ALIGNMENT
	#define BIGGEST_ALIGNMENT 64


	/* The svr4 ABI for the m68k says that records and unions are returned
	in memory. */

	#undef DEFAULT_PCC_STRUCT_RETURN
	#define DEFAULT_PCC_STRUCT_RETURN 1

	/* XXX
	This is the end of the chunk lifted from m68kv4.h */