1 /* DWARF2 EH unwinding support for IA64 Linux.
2 Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 3, or (at your
9 option) any later version.
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
25 /* Do code reading to identify a signal frame, and set the frame
26 state data appropriately. See unwind-dw2.c for the structs. */
28 /* This works only for glibc-2.3 and later, because sigcontext is different
31 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
33 #include <sys/ucontext.h>
35 #define IA64_GATE_AREA_START 0xa000000000000100LL
36 #define IA64_GATE_AREA_END 0xa000000000030000LL
38 #define MD_FALLBACK_FRAME_STATE_FOR ia64_fallback_frame_state
40 static _Unwind_Reason_Code
41 ia64_fallback_frame_state (struct _Unwind_Context *context,
42 _Unwind_FrameState *fs)
44 if (context->rp >= IA64_GATE_AREA_START
45 && context->rp < IA64_GATE_AREA_END)
49 unsigned long sig_number;
51 struct sigcontext *sc;
52 } *frame_ = (struct sigframe *)context->psp;
53 struct sigcontext *sc = frame_->sc;
55 /* Restore scratch registers in case the unwinder needs to
56 refer to a value stored in one of them. */
60 for (i = 2; i < 4; i++)
61 context->ireg[i - 2].loc = &sc->sc_gr[i];
62 for (i = 8; i < 12; i++)
63 context->ireg[i - 2].loc = &sc->sc_gr[i];
64 for (i = 14; i < 32; i++)
65 context->ireg[i - 2].loc = &sc->sc_gr[i];
68 context->fpsr_loc = &(sc->sc_ar_fpsr);
69 context->pfs_loc = &(sc->sc_ar_pfs);
70 context->lc_loc = &(sc->sc_ar_lc);
71 context->unat_loc = &(sc->sc_ar_unat);
72 context->br_loc[0] = &(sc->sc_br[0]);
73 context->br_loc[6] = &(sc->sc_br[6]);
74 context->br_loc[7] = &(sc->sc_br[7]);
75 context->pr = sc->sc_pr;
76 context->psp = sc->sc_gr[12];
77 context->gp = sc->sc_gr[1];
78 /* Signal frame doesn't have an associated reg. stack frame
79 other than what we adjust for below. */
80 fs -> no_reg_stack_frame = 1;
84 /* Need to switch from alternate register backing store. */
85 long ndirty, loadrs = sc->sc_loadrs >> 16;
86 unsigned long alt_bspstore = context->bsp - loadrs;
87 unsigned long bspstore;
88 unsigned long *ar_bsp = (unsigned long *)(sc->sc_ar_bsp);
90 ndirty = ia64_rse_num_regs ((unsigned long *) alt_bspstore,
91 (unsigned long *) context->bsp);
92 bspstore = (unsigned long)
93 ia64_rse_skip_regs (ar_bsp, -ndirty);
94 ia64_copy_rbs (context, bspstore, alt_bspstore, loadrs,
98 /* Don't touch the branch registers o.t. b0, b6 and b7.
99 The kernel doesn't pass the preserved branch registers
100 in the sigcontext but leaves them intact, so there's no
101 need to do anything with them here. */
103 unsigned long sof = sc->sc_cfm & 0x7f;
104 context->bsp = (unsigned long)
105 ia64_rse_skip_regs ((unsigned long *)(sc->sc_ar_bsp), -sof);
108 fs->curr.reg[UNW_REG_RP].where = UNW_WHERE_SPREL;
109 fs->curr.reg[UNW_REG_RP].val
110 = (unsigned long)&(sc->sc_ip) - context->psp;
111 fs->curr.reg[UNW_REG_RP].when = -1;
113 return _URC_NO_REASON;
115 return _URC_END_OF_STACK;
118 #define MD_HANDLE_UNWABI ia64_handle_unwabi
121 ia64_handle_unwabi (struct _Unwind_Context *context, _Unwind_FrameState *fs)
123 if (fs->unwabi == ((3 << 8) | 's')
124 || fs->unwabi == ((0 << 8) | 's'))
128 unsigned long sig_number;
129 struct siginfo *info;
130 struct sigcontext *sc;
131 } *frame = (struct sigframe *)context->psp;
132 struct sigcontext *sc = frame->sc;
134 /* Restore scratch registers in case the unwinder needs to
135 refer to a value stored in one of them. */
139 for (i = 2; i < 4; i++)
140 context->ireg[i - 2].loc = &sc->sc_gr[i];
141 for (i = 8; i < 12; i++)
142 context->ireg[i - 2].loc = &sc->sc_gr[i];
143 for (i = 14; i < 32; i++)
144 context->ireg[i - 2].loc = &sc->sc_gr[i];
147 context->pfs_loc = &(sc->sc_ar_pfs);
148 context->lc_loc = &(sc->sc_ar_lc);
149 context->unat_loc = &(sc->sc_ar_unat);
150 context->br_loc[0] = &(sc->sc_br[0]);
151 context->br_loc[6] = &(sc->sc_br[6]);
152 context->br_loc[7] = &(sc->sc_br[7]);
153 context->pr = sc->sc_pr;
154 context->gp = sc->sc_gr[1];
155 /* Signal frame doesn't have an associated reg. stack frame
156 other than what we adjust for below. */
157 fs -> no_reg_stack_frame = 1;
161 /* Need to switch from alternate register backing store. */
162 long ndirty, loadrs = sc->sc_loadrs >> 16;
163 unsigned long alt_bspstore = context->bsp - loadrs;
164 unsigned long bspstore;
165 unsigned long *ar_bsp = (unsigned long *)(sc->sc_ar_bsp);
167 ndirty = ia64_rse_num_regs ((unsigned long *) alt_bspstore,
168 (unsigned long *) context->bsp);
169 bspstore = (unsigned long) ia64_rse_skip_regs (ar_bsp, -ndirty);
170 ia64_copy_rbs (context, bspstore, alt_bspstore, loadrs,
174 /* Don't touch the branch registers o.t. b0, b6 and b7.
175 The kernel doesn't pass the preserved branch registers
176 in the sigcontext but leaves them intact, so there's no
177 need to do anything with them here. */
179 unsigned long sof = sc->sc_cfm & 0x7f;
180 context->bsp = (unsigned long)
181 ia64_rse_skip_regs ((unsigned long *)(sc->sc_ar_bsp), -sof);
184 /* pfs_loc already set above. Without this pfs_loc would point
185 incorrectly to sc_cfm instead of sc_ar_pfs. */
186 fs->curr.reg[UNW_REG_PFS].where = UNW_WHERE_NONE;
189 #endif /* glibc-2.3 or better */