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arm-obsd-tdep.c
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1/* Target-dependent code for OpenBSD/arm.
2
3 Copyright (C) 2006-2023 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20#include "defs.h"
21#include "osabi.h"
22#include "trad-frame.h"
23#include "tramp-frame.h"
24
25#include "obsd-tdep.h"
26#include "arm-tdep.h"
27#include "solib-svr4.h"
28
29/* Signal trampolines. */
30
31static void
33 frame_info_ptr this_frame,
34 struct trad_frame_cache *cache,
35 CORE_ADDR func)
36{
37 CORE_ADDR sp, sigcontext_addr, addr;
38 int regnum;
39
40 /* We find the appropriate instance of `struct sigcontext' at a
41 fixed offset in the signal frame. */
43 sigcontext_addr = sp + 16;
44
45 /* PC. */
46 trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);
47
48 /* GPRs. */
49 for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
50 regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
51 trad_frame_set_reg_addr (cache, regnum, addr);
52
54}
55
56static const struct tramp_frame armobsd_sigframe =
57{
59 4,
60 {
61 { 0xe28d0010, ULONGEST_MAX }, /* add r0, sp, #16 */
62 { 0xef000067, ULONGEST_MAX }, /* swi SYS_sigreturn */
63 { 0xef000001, ULONGEST_MAX }, /* swi SYS_exit */
64 { 0xeafffffc, ULONGEST_MAX }, /* b . - 8 */
65 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
66 },
68};
69
70
71/* Override default thumb breakpoints. */
72static const gdb_byte arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
73static const gdb_byte arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};
74
75static void
77 struct gdbarch *gdbarch)
78{
79 arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch);
80
81 if (tdep->fp_model == ARM_FLOAT_AUTO)
82 tdep->fp_model = ARM_FLOAT_SOFT_VFP;
83
85
86 /* OpenBSD/arm uses SVR4-style shared libraries. */
90
91 tdep->jb_pc = 24;
92 tdep->jb_elt_size = 4;
93
96
97 /* OpenBSD/arm uses -fpcc-struct-return by default. */
98 tdep->struct_return = pcc_struct_return;
99
100 /* Single stepping. */
102
103 /* Breakpoints. */
104 switch (info.byte_order)
105 {
106 case BFD_ENDIAN_BIG:
109 break;
110
111 case BFD_ENDIAN_LITTLE:
114 break;
115 }
116}
117
119void
int regnum
void armbsd_iterate_over_regset_sections(struct gdbarch *gdbarch, iterate_over_regset_sections_cb *cb, void *cb_data, const struct regcache *regcache)
static void armobsd_sigframe_init(const struct tramp_frame *self, frame_info_ptr this_frame, struct trad_frame_cache *cache, CORE_ADDR func)
static const gdb_byte arm_obsd_thumb_be_breakpoint[]
void _initialize_armobsd_tdep()
static const struct tramp_frame armobsd_sigframe
static const gdb_byte arm_obsd_thumb_le_breakpoint[]
static void armobsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
std::vector< CORE_ADDR > arm_software_single_step(struct regcache *regcache)
Definition arm-tdep.c:7283
@ pcc_struct_return
Definition arm-tdep.h:85
@ ARM_FLOAT_AUTO
Definition arm-tdep.h:64
@ ARM_FLOAT_SOFT_VFP
Definition arm-tdep.h:67
@ ARM_PC_REGNUM
Definition arm.h:46
@ ARM_LR_REGNUM
Definition arm.h:45
@ ARM_A1_REGNUM
Definition arm.h:40
@ ARM_SP_REGNUM
Definition arm.h:44
LONGEST get_frame_register_signed(frame_info_ptr frame, int regnum)
Definition frame.c:1365
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition frame.c:736
@ SIGTRAMP_FRAME
Definition frame.h:198
void set_gdbarch_software_single_step(struct gdbarch *gdbarch, gdbarch_software_single_step_ftype *software_single_step)
void set_gdbarch_skip_solib_resolver(struct gdbarch *gdbarch, gdbarch_skip_solib_resolver_ftype *skip_solib_resolver)
void set_gdbarch_iterate_over_regset_sections(struct gdbarch *gdbarch, gdbarch_iterate_over_regset_sections_ftype *iterate_over_regset_sections)
CORE_ADDR obsd_skip_solib_resolver(struct gdbarch *gdbarch, CORE_ADDR pc)
Definition obsd-tdep.c:29
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition osabi.c:146
@ GDB_OSABI_OPENBSD
Definition osabi.h:35
void(* func)(remote_target *remote, char *)
void set_solib_svr4_fetch_link_map_offsets(struct gdbarch *gdbarch, struct link_map_offsets *(*flmo)(void))
struct link_map_offsets * svr4_ilp32_fetch_link_map_offsets(void)
const gdb_byte * thumb_breakpoint
Definition arm-tdep.h:146
size_t jb_elt_size
Definition arm-tdep.h:159
int thumb_breakpoint_size
Definition arm-tdep.h:147
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition trad-frame.c:110
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition trad-frame.c:220
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
#define TRAMP_SENTINEL_INSN
Definition tramp-frame.h:44