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d195bc9f MK |
1 | /* Native-dependent code for OpenBSD/powerpc. |
2 | ||
6aba47ca | 3 | Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
d195bc9f MK |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
d195bc9f MK |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d195bc9f MK |
19 | |
20 | #include "defs.h" | |
0ae4f2cb | 21 | #include "gdbcore.h" |
d195bc9f MK |
22 | #include "inferior.h" |
23 | #include "regcache.h" | |
24 | ||
8599da2d | 25 | #include "gdb_assert.h" |
d195bc9f MK |
26 | #include <stddef.h> |
27 | #include <sys/types.h> | |
28 | #include <sys/ptrace.h> | |
0ae4f2cb MK |
29 | #include <sys/signal.h> |
30 | #include <machine/frame.h> | |
31 | #include <machine/pcb.h> | |
d195bc9f MK |
32 | #include <machine/reg.h> |
33 | ||
c79ac407 | 34 | #include "ppc-tdep.h" |
d195bc9f | 35 | #include "ppcobsd-tdep.h" |
65d034bc | 36 | #include "inf-ptrace.h" |
0ae4f2cb | 37 | #include "bsd-kvm.h" |
d195bc9f | 38 | |
8599da2d MK |
39 | /* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release |
40 | 4.0. On older releases the floating-point registers are handled by | |
41 | PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */ | |
42 | ||
43 | #ifdef PT_GETFPREGS | |
44 | ||
45 | /* Returns true if PT_GETFPREGS fetches this register. */ | |
46 | ||
47 | static int | |
48 | getfpregs_supplies (int regnum) | |
49 | { | |
50 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
51 | ||
52 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating | |
53 | point registers. Traditionally, GDB's register set has still | |
54 | listed the floating point registers for such machines, so this | |
55 | code is harmless. However, the new E500 port actually omits the | |
56 | floating point registers entirely from the register set --- they | |
57 | don't even have register numbers assigned to them. | |
58 | ||
59 | It's not clear to me how best to update this code, so this assert | |
60 | will alert the first person to encounter the NetBSD/E500 | |
61 | combination to the problem. */ | |
62 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); | |
63 | ||
64 | return ((regnum >= tdep->ppc_fp0_regnum | |
65 | && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs) | |
66 | || regnum == tdep->ppc_fpscr_regnum); | |
67 | } | |
68 | ||
69 | #endif /* PT_GETFPREGS */ | |
d195bc9f MK |
70 | |
71 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
72 | for all registers. */ | |
73 | ||
65d034bc | 74 | static void |
56be3814 | 75 | ppcobsd_fetch_registers (struct regcache *regcache, int regnum) |
d195bc9f MK |
76 | { |
77 | struct reg regs; | |
78 | ||
79 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 80 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 81 | perror_with_name (_("Couldn't get registers")); |
d195bc9f | 82 | |
56be3814 | 83 | ppc_supply_gregset (&ppcobsd_gregset, regcache, -1, |
8599da2d MK |
84 | ®s, sizeof regs); |
85 | #ifndef PT_GETFPREGS | |
56be3814 | 86 | ppc_supply_fpregset (&ppcobsd_gregset, regcache, -1, |
8599da2d MK |
87 | ®s, sizeof regs); |
88 | #endif | |
89 | ||
90 | #ifdef PT_GETFPREGS | |
91 | if (regnum == -1 || getfpregs_supplies (regnum)) | |
92 | { | |
93 | struct fpreg fpregs; | |
94 | ||
95 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), | |
96 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
97 | perror_with_name (_("Couldn't get floating point status")); | |
98 | ||
56be3814 | 99 | ppc_supply_fpregset (&ppcobsd_fpregset, regcache, -1, |
8599da2d MK |
100 | &fpregs, sizeof fpregs); |
101 | } | |
102 | #endif | |
d195bc9f MK |
103 | } |
104 | ||
105 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
106 | this for all registers. */ | |
107 | ||
65d034bc | 108 | static void |
56be3814 | 109 | ppcobsd_store_registers (struct regcache *regcache, int regnum) |
d195bc9f MK |
110 | { |
111 | struct reg regs; | |
112 | ||
113 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 114 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 115 | perror_with_name (_("Couldn't get registers")); |
d195bc9f | 116 | |
56be3814 | 117 | ppc_collect_gregset (&ppcobsd_gregset, regcache, |
8599da2d MK |
118 | regnum, ®s, sizeof regs); |
119 | #ifndef PT_GETFPREGS | |
56be3814 | 120 | ppc_collect_fpregset (&ppcobsd_gregset, regcache, |
8599da2d MK |
121 | regnum, ®s, sizeof regs); |
122 | #endif | |
d195bc9f MK |
123 | |
124 | if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 125 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 126 | perror_with_name (_("Couldn't write registers")); |
8599da2d MK |
127 | |
128 | #ifdef PT_GETFPREGS | |
129 | if (regnum == -1 || getfpregs_supplies (regnum)) | |
130 | { | |
131 | struct fpreg fpregs; | |
132 | ||
133 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), | |
134 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
135 | perror_with_name (_("Couldn't get floating point status")); | |
136 | ||
56be3814 | 137 | ppc_collect_fpregset (&ppcobsd_fpregset, regcache, |
8599da2d MK |
138 | regnum, &fpregs, sizeof fpregs); |
139 | ||
140 | if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), | |
141 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
142 | perror_with_name (_("Couldn't write floating point status")); | |
143 | } | |
144 | #endif | |
d195bc9f MK |
145 | } |
146 | \f | |
147 | ||
0ae4f2cb MK |
148 | static int |
149 | ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
150 | { | |
151 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); | |
152 | struct switchframe sf; | |
153 | struct callframe cf; | |
154 | int i, regnum; | |
155 | ||
156 | /* The following is true for OpenBSD 3.7: | |
157 | ||
158 | The pcb contains %r1 (the stack pointer) at the point of the | |
159 | context switch in cpu_switch(). At that point we have a stack | |
160 | frame as described by `struct switchframe', and below that a call | |
161 | frame as described by `struct callframe'. From this information | |
162 | we reconstruct the register state as it would look when we are in | |
163 | cpu_switch(). */ | |
164 | ||
165 | /* The stack pointer shouldn't be zero. */ | |
166 | if (pcb->pcb_sp == 0) | |
167 | return 0; | |
168 | ||
169 | read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf); | |
3e8c568d | 170 | regcache_raw_supply (regcache, gdbarch_sp_regnum (current_gdbarch), &sf.sp); |
0ae4f2cb MK |
171 | regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr); |
172 | regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2); | |
173 | for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++) | |
174 | regcache_raw_supply (regcache, regnum, &sf.fixreg[i]); | |
175 | ||
176 | read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf); | |
3e8c568d | 177 | regcache_raw_supply (regcache, gdbarch_pc_regnum (current_gdbarch), &cf.lr); |
0ae4f2cb MK |
178 | regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30); |
179 | regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31); | |
180 | ||
181 | return 1; | |
182 | } | |
183 | \f | |
184 | ||
d195bc9f MK |
185 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
186 | void _initialize_ppcobsd_nat (void); | |
187 | ||
188 | void | |
189 | _initialize_ppcobsd_nat (void) | |
190 | { | |
65d034bc MK |
191 | struct target_ops *t; |
192 | ||
193 | /* Add in local overrides. */ | |
194 | t = inf_ptrace_target (); | |
195 | t->to_fetch_registers = ppcobsd_fetch_registers; | |
196 | t->to_store_registers = ppcobsd_store_registers; | |
197 | add_target (t); | |
198 | ||
d195bc9f MK |
199 | /* General-purpose registers. */ |
200 | ppcobsd_reg_offsets.r0_offset = offsetof (struct reg, gpr); | |
f2db237a AM |
201 | ppcobsd_reg_offsets.gpr_size = 4; |
202 | ppcobsd_reg_offsets.xr_size = 4; | |
d195bc9f MK |
203 | ppcobsd_reg_offsets.pc_offset = offsetof (struct reg, pc); |
204 | ppcobsd_reg_offsets.ps_offset = offsetof (struct reg, ps); | |
205 | ppcobsd_reg_offsets.cr_offset = offsetof (struct reg, cnd); | |
206 | ppcobsd_reg_offsets.lr_offset = offsetof (struct reg, lr); | |
207 | ppcobsd_reg_offsets.ctr_offset = offsetof (struct reg, cnt); | |
208 | ppcobsd_reg_offsets.xer_offset = offsetof (struct reg, xer); | |
209 | ppcobsd_reg_offsets.mq_offset = offsetof (struct reg, mq); | |
210 | ||
211 | /* Floating-point registers. */ | |
212 | ppcobsd_reg_offsets.f0_offset = offsetof (struct reg, fpr); | |
213 | ppcobsd_reg_offsets.fpscr_offset = -1; | |
8599da2d MK |
214 | #ifdef PT_GETFPREGS |
215 | ppcobsd_fpreg_offsets.f0_offset = offsetof (struct fpreg, fpr); | |
216 | ppcobsd_fpreg_offsets.fpscr_offset = offsetof (struct fpreg, fpscr); | |
f2db237a | 217 | ppcobsd_fpreg_offsets.fpscr_size = 4; |
8599da2d | 218 | #endif |
d195bc9f MK |
219 | |
220 | /* AltiVec registers. */ | |
221 | ppcobsd_reg_offsets.vr0_offset = offsetof (struct vreg, vreg); | |
222 | ppcobsd_reg_offsets.vscr_offset = offsetof (struct vreg, vscr); | |
223 | ppcobsd_reg_offsets.vrsave_offset = offsetof (struct vreg, vrsave); | |
0ae4f2cb MK |
224 | |
225 | /* Support debugging kernel virtual memory images. */ | |
226 | bsd_kvm_add_target (ppcobsd_supply_pcb); | |
d195bc9f | 227 | } |