xref: /netbsd-src/external/gpl3/gdb/dist/gdbserver/netbsd-aarch64-low.cc (revision 64f917f5a88990e32dd65fcd4348042fa7f852b9)
1 /* Copyright (C) 2020-2024 Free Software Foundation, Inc.
2 
3    This file is part of GDB.
4 
5    This program is free software; you can redistribute it and/or modify
6    it under the terms of the GNU General Public License as published by
7    the Free Software Foundation; either version 3 of the License, or
8    (at your option) any later version.
9 
10    This program is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13    GNU General Public License for more details.
14 
15    You should have received a copy of the GNU General Public License
16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17 
18 #include <sys/types.h>
19 #include <sys/ptrace.h>
20 #include <limits.h>
21 
22 #include "netbsd-low.h"
23 #include "arch/aarch64.h"
24 #include "arch/aarch64-insn.h"
25 #include "tdesc.h"
26 
27 /* The fill_function for the general-purpose register set.  */
28 
29 static void
30 netbsd_aarch64_fill_gregset (struct regcache *regcache, char *buf)
31 {
32   struct reg *r = (struct reg *) buf;
33 
34 #define netbsd_aarch64_collect_gp(regnum, fld) do {		\
35     collect_register (regcache, regnum, &r->fld);		\
36   } while (0)
37 
38   for (size_t i = 0; i < ARRAY_SIZE (r->r_reg); i++)
39     netbsd_aarch64_collect_gp (AARCH64_X0_REGNUM + i, r_reg[i]);
40 
41   netbsd_aarch64_collect_gp (AARCH64_SP_REGNUM, r_sp);
42   netbsd_aarch64_collect_gp (AARCH64_PC_REGNUM, r_pc);
43 }
44 
45 /* The store_function for the general-purpose register set.  */
46 
47 static void
48 netbsd_aarch64_store_gregset (struct regcache *regcache, const char *buf)
49 {
50   struct reg *r = (struct reg *) buf;
51 
52 #define netbsd_aarch64_supply_gp(regnum, fld) do {		\
53     supply_register (regcache, regnum, &r->fld);		\
54   } while(0)
55 
56   for (size_t i = 0; i < ARRAY_SIZE (r->r_reg); i++)
57     netbsd_aarch64_supply_gp (AARCH64_X0_REGNUM + i, r_reg[i]);
58 
59   netbsd_aarch64_supply_gp (AARCH64_SP_REGNUM, r_sp);
60   netbsd_aarch64_supply_gp (AARCH64_PC_REGNUM, r_pc);
61 }
62 
63 /* Description of all the aarch64-netbsd register sets.  */
64 
65 static const struct netbsd_regset_info netbsd_target_regsets[] =
66 {
67   /* General Purpose Registers.  */
68   {PT_GETREGS, PT_SETREGS, sizeof (struct reg),
69   netbsd_aarch64_fill_gregset, netbsd_aarch64_store_gregset},
70   /* End of list marker.  */
71   {0, 0, -1, NULL, NULL }
72 };
73 
74 /* NetBSD target op definitions for the aarch64 architecture.  */
75 
76 class netbsd_aarch64_target : public netbsd_process_target
77 {
78 protected:
79   const netbsd_regset_info *get_regs_info () override;
80 
81   void low_arch_setup () override;
82 };
83 
84 /* Return the information to access registers.  */
85 
86 const netbsd_regset_info *
87 netbsd_aarch64_target::get_regs_info ()
88 {
89   return netbsd_target_regsets;
90 }
91 
92 /* Architecture-specific setup for the current process.  */
93 
94 void
95 netbsd_aarch64_target::low_arch_setup ()
96 {
97   target_desc *tdesc
98     = aarch64_create_target_description ({});
99 
100   static const char *expedite_regs_aarch64[] = { "x29", "sp", "pc", NULL };
101   init_target_desc (tdesc, expedite_regs_aarch64);
102 
103   current_process ()->tdesc = tdesc;
104 }
105 
106 /* The singleton target ops object.  */
107 
108 static netbsd_aarch64_target the_netbsd_aarch64_target;
109 
110 /* The NetBSD target ops object.  */
111 
112 netbsd_process_target *the_netbsd_target = &the_netbsd_aarch64_target;
113