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1.1 root 1: /* Definitions of target machine for GNU compiler.
2:
3: Citicorp/TTI Unicom PBB version (using GAS with a %-register prefix)
4:
5: Copyright (C) 1987, 1988, 1990 Free Software Foundation, Inc.
6:
7: This file is part of GNU CC.
8:
9: GNU CC is free software; you can redistribute it and/or modify
10: it under the terms of the GNU General Public License as published by
11: the Free Software Foundation; either version 2, or (at your option)
12: any later version.
13:
14: GNU CC is distributed in the hope that it will be useful,
15: but WITHOUT ANY WARRANTY; without even the implied warranty of
16: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: GNU General Public License for more details.
18:
19: You should have received a copy of the GNU General Public License
20: along with GNU CC; see the file COPYING. If not, write to
21: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
22:
23: /* Note: This config uses a version of gas with a postprocessing stage that
24: converts the output of gas to coff containing stab debug symbols.
25: (See [email protected] or [email protected]) */
26:
27: #include "m68k.h"
28:
29: /* See m68k.h. 5 means 68020 without 68881. */
30:
31: #define TARGET_DEFAULT 5
32:
33: /* Every structure or union's size must be a multiple of 2 bytes. */
34: #define STRUCTURE_SIZE_BOUNDARY 16
35:
36: /* Define __HAVE_68881__ in preprocessor if -m68881 is specified.
37: This will control the use of inline 68881 insns in certain macros. */
38:
39: #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
40:
41: /* Names to predefine in the preprocessor for this target machine. */
42:
43: #define CPP_PREDEFINES "-Dm68k -Dunix -DUnicomPBB -Dmc68k -Dmc68020 -Dmc68k32"
44:
45: /* We want DBX format for use with gdb under COFF. */
46:
47: #define DBX_DEBUGGING_INFO
48:
49: /* Generate calls to memcpy, memcmp and memset. */
50:
51: #define TARGET_MEM_FUNCTIONS
52:
53: /* -m68000 requires special flags to the assembler. */
54:
55: #define ASM_SPEC \
56: " %{m68000:-mc68010}%{mc68000:-mc68010}"
57:
58: /* we use /lib/libp/lib* when profiling */
59:
60: #define LIB_SPEC "%{p:-L/usr/lib/libp} %{pg:-L/usr/lib/libp} -lc"
61:
62:
63: /* Use crt1.o as a startup file and crtn.o as a closing file. */
64: /*
65: * The loader directive file gcc.ifile defines how to merge the constructor
66: * sections into the data section. Also, since gas only puts out those
67: * sections in response to N_SETT stabs, and does not (yet) have a
68: * ".sections" directive, gcc.ifile also defines the list symbols
69: * __DTOR_LIST__ and __CTOR_LIST__.
70: *
71: * Finally, we must explicitly specify the file from libgcc.a that defines
72: * exit(), otherwise if the user specifies (for example) "-lc_s" on the
73: * command line, the wrong exit() will be used and global destructors will
74: * not get called .
75: */
76:
77: #define STARTFILE_SPEC \
78: "%{!r: gcc.ifile%s} %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} \
79: %{!r:_exit.o%s}"
80:
81: #define ENDFILE_SPEC "crtn.o%s"
82:
83: /* cpp has to support a #sccs directive for the /usr/include files */
84:
85: #define SCCS_DIRECTIVE
86:
87: /* GAS register prefix assembly syntax: */
88:
89: /* User labels have no prefix */
90: #undef USER_LABEL_PREFIX
91: #define USER_LABEL_PREFIX ""
92:
93: /* local labels are prefixed with ".L" */
94: #undef LOCAL_LABEL_PREFIX
95: #define LOCAL_LABEL_PREFIX "."
96:
97: /* registers are prefixed with "%" */
98: #undef REGISTER_PREFIX
99: #define REGISTER_PREFIX "%"
100:
101: #undef REGISTER_NAMES
102: #define REGISTER_NAMES \
103: {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
104: "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
105: "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7"}
106:
107: #undef FUNCTION_EXTRA_EPILOGUE
108: #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
109: { extern int current_function_returns_pointer; \
110: if ((current_function_returns_pointer) && \
111: ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
112: asm_fprintf (FILE, "\tmovl %Rd0,%Ra0\n"); }
113:
114: #define ASM_RETURN_CASE_JUMP return "jmp %%pc@(2,%0:w)"
115:
116: /* Although the gas we use can create .ctor and .dtor sections from N_SETT
117: stabs, it does not support section directives, so we need to have the loader
118: define the lists.
119: */
120: #define CTOR_LISTS_DEFINED_EXTERNALLY
121:
122: /* similar to default, but allows for the table defined by ld with gcc.ifile.
123: nptrs is always 0. So we need to instead check that __DTOR_LIST__[1] != 0.
124: The old check is left in so that the same macro can be used if and when
125: a future version of gas does support section directives. */
126:
127: #define DO_GLOBAL_DTORS_BODY {int nptrs = *(int *)__DTOR_LIST__; int i; \
128: if (nptrs == -1 || (__DTOR_LIST__[0] == 0 && __DTOR_LIST__[1] != 0)) \
129: for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++); \
130: for (i = nptrs; i >= 1; i--) \
131: __DTOR_LIST__[i] (); }
132:
133: /*
134: * Here is an example gcc.ifile. I've tested it on PBB 68k and on sco 386
135: * systems. The NEXT(0x200000) works on just about all 386 and m68k systems,
136: * but can be reduced to any power of 2 that is >= NBPS (0x10000 on a pbb).
137:
138: SECTIONS {
139: .text BIND(0x200200) BLOCK (0x200) :
140: { *(.init) *(.text) vfork = fork; *(.fini) }
141:
142: GROUP BIND( NEXT(0x200000) + ADDR(.text) + SIZEOF(.text)):
143: { .data : { __CTOR_LIST__ = . ; . += 4; *(.ctor) . += 4 ;
144: __DTOR_LIST__ = . ; . += 4; *(.dtor) . += 4 ; }
145: .bss : { }
146: }
147: }
148: */
149:
150: /*
151: Local variables:
152: version-control: t
153: End:
154: */
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