1 /* HP PA-RISC SOM object file format: definitions internal to BFD.
2 Copyright (C) 1990-2016 Free Software Foundation, Inc.
4 Contributed by the Center for Software Science at the
5 University of Utah (pa-gdb-bugs@cs.utah.edu).
7 This file is part of BFD, the Binary File Descriptor library.
9 This program 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 3 of the License, or
12 (at your option) any later version.
14 This program 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.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
27 #define BYTES_IN_WORD 4
28 #define PA_PAGESIZE 0x1000
30 /* The PA instruction set variants. */
31 enum pa_arch {pa10 = 10, pa11 = 11, pa20 = 20, pa20w = 25};
33 /* HP PA-RISC relocation types */
35 enum hppa_reloc_field_selector_type
59 /* /usr/include/reloc.h defines these to constants. We want to use
60 them in enums, so #undef them before we start using them. We might
61 be able to fix this another way by simply managing not to include
62 /usr/include/reloc.h, but currently GDB picks up these defines
89 /* for compatibility */
90 enum hppa_reloc_field_selector_type_alt
93 e_lssel = R_HPPA_LSSEL,
94 e_rssel = R_HPPA_RSSEL,
97 e_ldsel = R_HPPA_LDSEL,
98 e_rdsel = R_HPPA_RDSEL,
99 e_lrsel = R_HPPA_LRSEL,
100 e_rrsel = R_HPPA_RRSEL,
101 e_nsel = R_HPPA_NSEL,
102 e_nlsel = R_HPPA_NLSEL,
103 e_nlrsel = R_HPPA_NLRSEL,
104 e_psel = R_HPPA_PSEL,
105 e_lpsel = R_HPPA_LPSEL,
106 e_rpsel = R_HPPA_RPSEL,
107 e_tsel = R_HPPA_TSEL,
108 e_ltsel = R_HPPA_LTSEL,
109 e_rtsel = R_HPPA_RTSEL,
110 e_ltpsel = R_HPPA_LTPSEL,
111 e_rtpsel = R_HPPA_RTPSEL
114 enum hppa_reloc_expr_type
124 /* for compatibility */
125 enum hppa_reloc_expr_type_alt
127 e_one = R_HPPA_E_ONE,
128 e_two = R_HPPA_E_TWO,
129 e_pcrel = R_HPPA_E_PCREL,
130 e_con = R_HPPA_E_CON,
131 e_plabel = R_HPPA_E_PLABEL,
136 /* Relocations for function calls must be accompanied by parameter
137 relocation bits. These bits describe exactly where the caller has
138 placed the function's arguments and where it expects to find a return
141 Both ELF and SOM encode this information within the addend field
142 of the call relocation. (Note this could break very badly if one
143 was to make a call like bl foo + 0x12345678).
145 The high order 10 bits contain parameter relocation information,
146 the low order 22 bits contain the constant offset. */
148 #define HPPA_R_ARG_RELOC(a) \
149 (((a) >> 22) & 0x3ff)
150 #define HPPA_R_CONSTANT(a) \
151 ((((bfd_signed_vma)(a)) << (BFD_ARCH_SIZE-22)) >> (BFD_ARCH_SIZE-22))
152 #define HPPA_R_ADDEND(r, c) \
153 (((r) << 22) + ((c) & 0x3fffff))
156 /* Some functions to manipulate PA instructions. */
158 /* Declare the functions with the unused attribute to avoid warnings. */
159 static inline int sign_extend (int, int) ATTRIBUTE_UNUSED;
160 static inline int low_sign_extend (int, int) ATTRIBUTE_UNUSED;
161 static inline int sign_unext (int, int) ATTRIBUTE_UNUSED;
162 static inline int low_sign_unext (int, int) ATTRIBUTE_UNUSED;
163 static inline int re_assemble_3 (int) ATTRIBUTE_UNUSED;
164 static inline int re_assemble_12 (int) ATTRIBUTE_UNUSED;
165 static inline int re_assemble_14 (int) ATTRIBUTE_UNUSED;
166 static inline int re_assemble_16 (int) ATTRIBUTE_UNUSED;
167 static inline int re_assemble_17 (int) ATTRIBUTE_UNUSED;
168 static inline int re_assemble_21 (int) ATTRIBUTE_UNUSED;
169 static inline int re_assemble_22 (int) ATTRIBUTE_UNUSED;
170 static inline bfd_signed_vma hppa_field_adjust
171 (bfd_vma, bfd_signed_vma, enum hppa_reloc_field_selector_type_alt)
173 static inline int bfd_hppa_insn2fmt (bfd *, int) ATTRIBUTE_UNUSED;
174 static inline int hppa_rebuild_insn (int, int, int) ATTRIBUTE_UNUSED;
177 /* The *sign_extend functions are used to assemble various bitfields
178 taken from an instruction and return the resulting immediate
182 sign_extend (int x, int len)
184 int signbit = (1 << (len - 1));
185 int mask = (signbit << 1) - 1;
186 return ((x & mask) ^ signbit) - signbit;
190 low_sign_extend (int x, int len)
192 return (x >> 1) - ((x & 1) << (len - 1));
196 /* The re_assemble_* functions prepare an immediate value for
197 insertion into an opcode. pa-risc uses all sorts of weird bitfields
198 in the instruction to hold the value. */
201 sign_unext (int x, int len)
205 len_ones = (1 << len) - 1;
211 low_sign_unext (int x, int len)
216 sign = (x >> (len-1)) & 1;
218 temp = sign_unext (x, len-1);
220 return (temp << 1) | sign;
224 re_assemble_3 (int as3)
226 return (( (as3 & 4) << (13-2))
227 | ((as3 & 3) << (13+1)));
231 re_assemble_12 (int as12)
233 return (( (as12 & 0x800) >> 11)
234 | ((as12 & 0x400) >> (10 - 2))
235 | ((as12 & 0x3ff) << (1 + 2)));
239 re_assemble_14 (int as14)
241 return (( (as14 & 0x1fff) << 1)
242 | ((as14 & 0x2000) >> 13));
246 re_assemble_16 (int as16)
250 /* Unusual 16-bit encoding, for wide mode only. */
251 t = (as16 << 1) & 0xffff;
253 return (t ^ s ^ (s >> 1)) | (s >> 15);
257 re_assemble_17 (int as17)
259 return (( (as17 & 0x10000) >> 16)
260 | ((as17 & 0x0f800) << (16 - 11))
261 | ((as17 & 0x00400) >> (10 - 2))
262 | ((as17 & 0x003ff) << (1 + 2)));
266 re_assemble_21 (int as21)
268 return (( (as21 & 0x100000) >> 20)
269 | ((as21 & 0x0ffe00) >> 8)
270 | ((as21 & 0x000180) << 7)
271 | ((as21 & 0x00007c) << 14)
272 | ((as21 & 0x000003) << 12));
276 re_assemble_22 (int as22)
278 return (( (as22 & 0x200000) >> 21)
279 | ((as22 & 0x1f0000) << (21 - 16))
280 | ((as22 & 0x00f800) << (16 - 11))
281 | ((as22 & 0x000400) >> (10 - 2))
282 | ((as22 & 0x0003ff) << (1 + 2)));
286 /* Handle field selectors for PA instructions.
287 The L and R (and LS, RS etc.) selectors are used in pairs to form a
288 full 32 bit address. eg.
290 LDIL L'start,%r1 ; put left part into r1
291 LDW R'start(%r1),%r2 ; add r1 and right part to form address
293 This function returns sign extended values in all cases.
296 static inline bfd_signed_vma
297 hppa_field_adjust (bfd_vma sym_val,
298 bfd_signed_vma addend,
299 enum hppa_reloc_field_selector_type_alt r_field)
301 bfd_signed_vma value;
303 value = sym_val + addend;
311 /* N: null selector. I don't really understand what this is all
312 about, but HP's documentation says "this indicates that zero
313 bits are to be used for the displacement on the instruction.
314 This fixup is used to identify three-instruction sequences to
315 access data (for importing shared library data)." */
321 /* L: Select top 21 bits. */
326 /* R: Select bottom 11 bits. */
327 value = value & 0x7ff;
331 /* LS: Round to nearest multiple of 2048 then select top 21 bits. */
332 value = value + 0x400;
337 /* RS: Select bottom 11 bits for LS.
338 We need to return a value such that 2048 * LS'x + RS'x == x.
339 ie. RS'x = x - ((x + 0x400) & -0x800)
340 this is just a sign extension from bit 21. */
341 value = ((value & 0x7ff) ^ 0x400) - 0x400;
345 /* LD: Round to next multiple of 2048 then select top 21 bits.
346 Yes, if we are already on a multiple of 2048, we go up to the
347 next one. RD in this case will be -2048. */
348 value = value + 0x800;
353 /* RD: Set bits 0-20 to one. */
354 value = value | -0x800;
359 /* LR: L with rounding of the addend to nearest 8k. */
360 value = sym_val + ((addend + 0x1000) & -0x2000);
365 /* RR: R with rounding of the addend to nearest 8k.
366 We need to return a value such that 2048 * LR'x + RR'x == x
367 ie. RR'x = s+a - (s + (((a + 0x1000) & -0x2000) & -0x800))
368 . = s+a - ((s & -0x800) + ((a + 0x1000) & -0x2000))
369 . = (s & 0x7ff) + a - ((a + 0x1000) & -0x2000) */
370 value = (sym_val & 0x7ff) + (((addend & 0x1fff) ^ 0x1000) - 0x1000);
379 /* PA-RISC OPCODES */
380 #define get_opcode(insn) (((insn) >> 26) & 0x3f)
382 enum hppa_opcode_type
384 /* None of the opcodes in the first group generate relocs, so we
385 aren't too concerned about them. */
460 /* Given a machine instruction, return its format. */
463 bfd_hppa_insn2fmt (bfd *abfd, int insn)
465 enum hppa_opcode_type op = (enum hppa_opcode_type) get_opcode (insn);
501 if (abfd->arch_info->mach >= 25)
502 return 16; /* Wide mode, format 16. */
509 /* This is a hack. Unfortunately, format 11 is already taken
510 and we're using integers rather than an enum, so it's hard
511 to describe the 11a format. */
512 if (abfd->arch_info->mach >= 25)
513 return -16; /* Wide mode, format 16a. */
518 if (abfd->arch_info->mach >= 25)
519 return -10; /* Wide mode, format 10a. */
523 if ((insn & 0x8000) != 0)
541 /* Insert VALUE into INSN using R_FORMAT to determine exactly what
545 hppa_rebuild_insn (int insn, int value, int r_format)
550 return (insn & ~ 0x7ff) | low_sign_unext (value, 11);
553 return (insn & ~ 0x1ffd) | re_assemble_12 (value);
557 return (insn & ~ 0x3ff1) | re_assemble_14 (value & -8);
560 return (insn & ~ 0x3ff9) | re_assemble_14 (value & -4);
563 return (insn & ~ 0x3fff) | re_assemble_14 (value);
567 return (insn & ~ 0xfff1) | re_assemble_16 (value & -8);
570 return (insn & ~ 0xfff9) | re_assemble_16 (value & -4);
573 return (insn & ~ 0xffff) | re_assemble_16 (value);
577 return (insn & ~ 0x1f1ffd) | re_assemble_17 (value);
580 return (insn & ~ 0x1fffff) | re_assemble_21 (value);
583 return (insn & ~ 0x3ff1ffd) | re_assemble_22 (value);
594 #endif /* _LIBHPPA_H */