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30 /* Copyright (c) 1996 NeXT Software, Inc. All rights reserved.
32 * File: architecture/ppc/reg_help.h
33 * Author: Doug Mitchell, NeXT Computer, Inc.
35 * m98k-specific macros and inlines for defining machine registers.
38 * 05-Nov-92 Doug Mitchell at NeXT
41 * 29-Dec-96 Umesh Vaishampayan (umeshv@NeXT.com)
42 * Ported from m98k. Removed dependency on nrw directory.
43 * Merged code from architecture/nrw/reg_help.h.
44 * Moved Register Usage #defines from asm_help.h in here.
47 #ifndef _ARCH_PPC_REG_HELP_H_
48 #define _ARCH_PPC_REG_HELP_H_
50 #if defined(__ASSEMBLER__)
52 * GRF Register Usage Aliases
54 #define zt r0 // architecturally 0 for mem refs only!
55 // real reg other inst, caller-saved
56 #define sp r1 // stack pointer, callee-saved
57 #define toc r2 // tbl of contents, callee-saved
58 #define a0 r3 // arg 0, return value 0, caller saved
59 #define a1 r4 // arg 1, return value 1, caller saved
65 #define a7 r10 // arg 7, return value 7, caller saved
66 #define ep r11 // environment ptr, caller saved
67 #define at r12 // assembler temp, caller saved
68 #define s17 r13 // callee-saved 17
84 #define s1 r29 // ....
85 #define s0 r30 // callee-saved 0
86 #define fp r31 // frame-pointer, callee-saved
89 * Conversion of GRF aliases to register numbers
91 #define GRF_ZT 0 // architecturally 0 for mem refs only!
92 // real reg other inst, caller-saved
93 #define GRF_SP 1 // stack pointer, callee-saved
94 #define GRF_TOC 2 // tbl of contents, callee-saved
95 #define GRF_A0 3 // arg 0, return value 0, caller saved
96 #define GRF_A1 4 // arg 1, return value 1, caller saved
97 #define GRF_A2 5 // ....
102 #define GRF_A7 10 // arg 7, return value 7, caller saved
103 #define GRF_EP 11 // environment ptr, caller saved
104 #define GRF_AT 12 // assembler temp, caller saved
105 #define GRF_S17 13 // callee-saved 17
121 #define GRF_S1 29 // ....
122 #define GRF_S0 30 // callee-saved 0
123 #define GRF_FP 31 // frame pointer, callee-saved
128 #define ft0 f0 // scratch reg, caller-saved
129 #define fa0 f1 // fp arg 0, return 0, caller-saved
130 #define fa1 f2 // fp arg 1, caller-saved
131 #define fa2 f3 // fp arg 2, caller-saved
141 #define fa12 f13 // fp arg 12, caller-saved
142 #define fs17 f14 // callee-saved 17
159 #define fs0 f31 // callee-saved 0
162 * Conversion of FPF aliases to register numbers
164 #define FPF_FT0 0 // scratch reg, caller-saved
165 #define FPF_FA0 1 // fp arg 0, return 0, caller-saved
166 #define FPF_FA1 2 // fp arg 1, caller-saved
167 #define FPF_FA2 3 // fp arg 2, caller-saved
177 #define FPF_FA12 13 // fp arg 12, caller-saved
178 #define FPF_FS17 14 // callee-saved 17
195 #define FPF_FS0 31 // callee-saved 0
197 #endif /* __ASSEMBLER__ */
200 /* Bitfield definition aid */
201 #define BITS_WIDTH(msb, lsb) ((msb)-(lsb)+1)
202 #define BIT_WIDTH(pos) (1) /* mostly to record the position */
205 #define MKMASK(width, offset) (((unsigned)-1)>>(32-(width))<<(offset))
206 #define BITSMASK(msb, lsb) MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
207 #define BITMASK(pos) MKMASK(BIT_WIDTH(pos), pos & 0x1f)
209 /* Register addresses */
211 # define REG_ADDR(type, addr) (addr)
212 #else /* ! __ASSEMBLER__ */
213 # define REG_ADDR(type, addr) (*(volatile type *)(addr))
214 #endif /* __ASSEMBLER__ */
216 /* Cast a register to be an unsigned */
217 /* CAUTION : non naturally aligned foo can result into alignment traps
220 #define CONTENTS(foo) (*(unsigned *) &(foo))
222 /* STRINGIFY -- perform all possible substitutions, then stringify */
223 #define __STR(x) #x /* just a helper macro */
224 #define STRINGIFY(x) __STR(x)
227 * Stack pointer must always be a multiple of 16
229 #define STACK_INCR 16
230 #define ROUND_FRAME(x) ((((unsigned)(x)) + STACK_INCR - 1) & ~(STACK_INCR-1))
232 #endif /* _ARCH_PPC_REG_HELP_H_ */