1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2001-2005 Hewlett-Packard Co
3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
5 This file is part of libunwind.
7 Permission is hereby granted, free of charge, to any person obtaining
8 a copy of this software and associated documentation files (the
9 "Software"), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sublicense, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
15 The above copyright notice and this permission notice shall be
16 included in all copies or substantial portions of the Software.
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
30 linux_sigtramp (struct cursor
*c
, ia64_loc_t prev_cfm_loc
,
31 unw_word_t
*num_regsp
)
33 #if defined(UNW_LOCAL_ONLY) && !defined(__linux)
39 if ((ret
= ia64_get (c
, IA64_LOC_ADDR (c
->sp
+ 0x10
40 + LINUX_SIGFRAME_ARG2_OFF
, 0),
44 c
->sigcontext_addr
= sc_addr
;
46 if (!IA64_IS_REG_LOC (c
->loc
[IA64_REG_IP
])
47 && IA64_GET_ADDR (c
->loc
[IA64_REG_IP
]) == sc_addr
+ LINUX_SC_BR_OFF
+ 8)
49 /* Linux kernels before 2.4.19 and 2.5.10 had buggy
50 unwind info for sigtramp. Fix it up here. */
51 c
->loc
[IA64_REG_IP
] = IA64_LOC_ADDR (sc_addr
+ LINUX_SC_IP_OFF
, 0);
52 c
->cfm_loc
= IA64_LOC_ADDR (sc_addr
+ LINUX_SC_CFM_OFF
, 0);
55 /* do what can't be described by unwind directives: */
56 c
->loc
[IA64_REG_PFS
] = IA64_LOC_ADDR (sc_addr
+ LINUX_SC_AR_PFS_OFF
, 0);
57 c
->ec_loc
= prev_cfm_loc
;
58 *num_regsp
= c
->cfm
& 0x7f; /* size of frame */
64 linux_interrupt (struct cursor
*c
, ia64_loc_t prev_cfm_loc
,
65 unw_word_t
*num_regsp
, int marker
)
67 #if defined(UNW_LOCAL_ONLY) && !(defined(__linux) && defined(__KERNEL__))
70 unw_word_t sc_addr
, num_regs
;
73 sc_addr
= c
->sigcontext_addr
= c
->sp
+ 0x10;
75 if ((c
->pr
& (1UL << LINUX_PT_P_NONSYS
)) != 0)
76 num_regs
= c
->cfm
& 0x7f;
80 /* do what can't be described by unwind directives: */
81 if (marker
== ABI_MARKER_OLD_LINUX_INTERRUPT
)
82 pfs_loc
= IA64_LOC_ADDR (sc_addr
+ LINUX_OLD_PT_PFS_OFF
, 0);
84 pfs_loc
= IA64_LOC_ADDR (sc_addr
+ LINUX_PT_PFS_OFF
, 0);
85 c
->loc
[IA64_REG_PFS
] = pfs_loc
;
86 c
->ec_loc
= prev_cfm_loc
;
87 *num_regsp
= num_regs
; /* size of frame */
93 hpux_sigtramp (struct cursor
*c
, ia64_loc_t prev_cfm_loc
,
94 unw_word_t
*num_regsp
)
96 #if defined(UNW_LOCAL_ONLY) && !defined(__hpux)
99 unw_word_t sc_addr
, bsp
, bspstore
;
103 /* HP-UX passes the address of ucontext_t in r32: */
104 if ((ret
= ia64_get_stacked (c
, 32, &sc_loc
, NULL
)) < 0)
106 if ((ret
= ia64_get (c
, sc_loc
, &sc_addr
)) < 0)
109 c
->sigcontext_addr
= sc_addr
;
111 /* Now mark all (preserved) registers as coming from the
113 c
->cfm_loc
= IA64_LOC_UC_REG (UNW_IA64_CFM
, sc_addr
);
114 c
->loc
[IA64_REG_PRI_UNAT_MEM
] = IA64_NULL_LOC
;
115 c
->loc
[IA64_REG_PSP
] = IA64_LOC_UC_REG (UNW_IA64_GR
+ 12, sc_addr
);
116 c
->loc
[IA64_REG_BSP
] = IA64_LOC_UC_REG (UNW_IA64_AR_BSP
, sc_addr
);
117 c
->loc
[IA64_REG_BSPSTORE
] = IA64_LOC_UC_REG (UNW_IA64_AR_BSPSTORE
, sc_addr
);
118 c
->loc
[IA64_REG_PFS
] = IA64_LOC_UC_REG (UNW_IA64_AR_PFS
, sc_addr
);
119 c
->loc
[IA64_REG_RNAT
] = IA64_LOC_UC_REG (UNW_IA64_AR_RNAT
, sc_addr
);
120 c
->loc
[IA64_REG_IP
] = IA64_LOC_UC_REG (UNW_IA64_IP
, sc_addr
);
121 c
->loc
[IA64_REG_R4
] = IA64_LOC_UC_REG (UNW_IA64_GR
+ 4, sc_addr
);
122 c
->loc
[IA64_REG_R5
] = IA64_LOC_UC_REG (UNW_IA64_GR
+ 5, sc_addr
);
123 c
->loc
[IA64_REG_R6
] = IA64_LOC_UC_REG (UNW_IA64_GR
+ 6, sc_addr
);
124 c
->loc
[IA64_REG_R7
] = IA64_LOC_UC_REG (UNW_IA64_GR
+ 7, sc_addr
);
125 c
->loc
[IA64_REG_NAT4
] = IA64_LOC_UC_REG (UNW_IA64_NAT
+ 4, sc_addr
);
126 c
->loc
[IA64_REG_NAT5
] = IA64_LOC_UC_REG (UNW_IA64_NAT
+ 5, sc_addr
);
127 c
->loc
[IA64_REG_NAT6
] = IA64_LOC_UC_REG (UNW_IA64_NAT
+ 6, sc_addr
);
128 c
->loc
[IA64_REG_NAT7
] = IA64_LOC_UC_REG (UNW_IA64_NAT
+ 7, sc_addr
);
129 c
->loc
[IA64_REG_UNAT
] = IA64_LOC_UC_REG (UNW_IA64_AR_UNAT
, sc_addr
);
130 c
->loc
[IA64_REG_PR
] = IA64_LOC_UC_REG (UNW_IA64_PR
, sc_addr
);
131 c
->loc
[IA64_REG_LC
] = IA64_LOC_UC_REG (UNW_IA64_AR_LC
, sc_addr
);
132 c
->loc
[IA64_REG_FPSR
] = IA64_LOC_UC_REG (UNW_IA64_AR_FPSR
, sc_addr
);
133 c
->loc
[IA64_REG_B1
] = IA64_LOC_UC_REG (UNW_IA64_BR
+ 1, sc_addr
);
134 c
->loc
[IA64_REG_B2
] = IA64_LOC_UC_REG (UNW_IA64_BR
+ 2, sc_addr
);
135 c
->loc
[IA64_REG_B3
] = IA64_LOC_UC_REG (UNW_IA64_BR
+ 3, sc_addr
);
136 c
->loc
[IA64_REG_B4
] = IA64_LOC_UC_REG (UNW_IA64_BR
+ 4, sc_addr
);
137 c
->loc
[IA64_REG_B5
] = IA64_LOC_UC_REG (UNW_IA64_BR
+ 5, sc_addr
);
138 c
->loc
[IA64_REG_F2
] = IA64_LOC_UC_REG (UNW_IA64_FR
+ 2, sc_addr
);
139 c
->loc
[IA64_REG_F3
] = IA64_LOC_UC_REG (UNW_IA64_FR
+ 3, sc_addr
);
140 c
->loc
[IA64_REG_F4
] = IA64_LOC_UC_REG (UNW_IA64_FR
+ 4, sc_addr
);
141 c
->loc
[IA64_REG_F5
] = IA64_LOC_UC_REG (UNW_IA64_FR
+ 5, sc_addr
);
142 for (i
= 0; i
< 16; ++i
)
143 c
->loc
[IA64_REG_F16
+ i
] = IA64_LOC_UC_REG (UNW_IA64_FR
+ 16 + i
, sc_addr
);
145 c
->pi
.flags
|= UNW_PI_FLAG_IA64_RBS_SWITCH
;
147 /* update the CFM cache: */
148 if ((ret
= ia64_get (c
, c
->cfm_loc
, &c
->cfm
)) < 0)
150 /* update the PSP cache: */
151 if ((ret
= ia64_get (c
, c
->loc
[IA64_REG_PSP
], &c
->psp
)) < 0)
154 if ((ret
= ia64_get (c
, c
->loc
[IA64_REG_BSP
], &bsp
)) < 0
155 || (ret
= ia64_get (c
, c
->loc
[IA64_REG_BSPSTORE
], &bspstore
)) < 0)
158 /* Dirty partition got spilled into the ucontext_t structure
159 itself. We'll need to access it via uc_access(3). */
160 rbs_switch (c
, bsp
, bspstore
, IA64_LOC_UC_ADDR (bsp
| 0x1f8, 0));
162 c
->ec_loc
= prev_cfm_loc
;
171 check_rbs_switch (struct cursor
*c
)
173 unw_word_t saved_bsp
, saved_bspstore
, loadrs
, ndirty
;
177 if (c
->pi
.flags
& UNW_PI_FLAG_IA64_RBS_SWITCH
)
179 /* Got ourselves a frame that has saved ar.bspstore, ar.bsp,
180 and ar.rnat, so we're all set for rbs-switching: */
181 if ((ret
= ia64_get (c
, c
->loc
[IA64_REG_BSP
], &saved_bsp
)) < 0
182 || (ret
= ia64_get (c
, c
->loc
[IA64_REG_BSPSTORE
], &saved_bspstore
)))
185 else if ((c
->abi_marker
== ABI_MARKER_LINUX_SIGTRAMP
186 || c
->abi_marker
== ABI_MARKER_OLD_LINUX_SIGTRAMP
)
187 && !IA64_IS_REG_LOC (c
->loc
[IA64_REG_BSP
])
188 && (IA64_GET_ADDR (c
->loc
[IA64_REG_BSP
])
189 == c
->sigcontext_addr
+ LINUX_SC_AR_BSP_OFF
))
191 /* When Linux delivers a signal on an alternate stack, it
192 does things a bit differently from what the unwind
193 conventions allow us to describe: instead of saving
194 ar.rnat, ar.bsp, and ar.bspstore, it saves the former two
195 plus the "loadrs" value. Because of this, we need to
196 detect & record a potential rbs-area switch
199 /* If ar.bsp has been saved already AND the current bsp is
200 not equal to the saved value, then we know for sure that
201 we're past the point where the backing store has been
202 switched (and before the point where it's restored). */
203 if ((ret
= ia64_get (c
, IA64_LOC_ADDR (c
->sigcontext_addr
204 + LINUX_SC_AR_BSP_OFF
, 0),
206 || (ret
= ia64_get (c
, IA64_LOC_ADDR (c
->sigcontext_addr
207 + LINUX_SC_LOADRS_OFF
, 0),
211 ndirty
= rse_num_regs (c
->bsp
- loadrs
, c
->bsp
);
212 saved_bspstore
= rse_skip_regs (saved_bsp
, -ndirty
);
215 if (saved_bsp
== c
->bsp
)
218 return rbs_switch (c
, saved_bsp
, saved_bspstore
, c
->loc
[IA64_REG_RNAT
]);
222 update_frame_state (struct cursor
*c
)
224 unw_word_t prev_ip
, prev_sp
, prev_bsp
, ip
, num_regs
;
225 ia64_loc_t prev_cfm_loc
;
228 prev_cfm_loc
= c
->cfm_loc
;
233 /* Update the IP cache (do this first: if we reach the end of the
234 frame-chain, the rest of the info may not be valid/useful
236 ret
= ia64_get (c
, c
->loc
[IA64_REG_IP
], &ip
);
243 /* don't let obviously bad addresses pollute the cache */
244 Debug (1, "rejecting bad ip=0x%lx\n", (long) c
->ip
);
245 return -UNW_EINVALIDIP
;
248 c
->cfm_loc
= c
->loc
[IA64_REG_PFS
];
249 /* update the CFM cache: */
250 ret
= ia64_get (c
, c
->cfm_loc
, &c
->cfm
);
254 /* Normally, AR.EC is stored in the CFM save-location. That
255 save-location contains the full function-state as defined by
256 AR.PFS. However, interruptions only save the frame-marker, not
257 any other info in CFM. Instead, AR.EC gets saved on the first
258 call by the interruption-handler. Thus, interruption-related
259 frames need to track the _previous_ CFM save-location since
260 that's were AR.EC is saved. We support this by setting ec_loc to
261 cfm_loc by default and giving frames marked with an ABI-marker
262 the chance to override this value with prev_cfm_loc. */
263 c
->ec_loc
= c
->cfm_loc
;
266 if (unlikely (c
->abi_marker
))
268 c
->last_abi_marker
= c
->abi_marker
;
269 switch (ia64_get_abi_marker (c
))
271 case ABI_MARKER_LINUX_SIGTRAMP
:
272 case ABI_MARKER_OLD_LINUX_SIGTRAMP
:
273 ia64_set_abi (c
, ABI_LINUX
);
274 if ((ret
= linux_sigtramp (c
, prev_cfm_loc
, &num_regs
)) < 0)
278 case ABI_MARKER_OLD_LINUX_INTERRUPT
:
279 case ABI_MARKER_LINUX_INTERRUPT
:
280 ia64_set_abi (c
, ABI_LINUX
);
281 if ((ret
= linux_interrupt (c
, prev_cfm_loc
, &num_regs
,
286 case ABI_MARKER_HP_UX_SIGTRAMP
:
287 ia64_set_abi (c
, ABI_HPUX
);
288 if ((ret
= hpux_sigtramp (c
, prev_cfm_loc
, &num_regs
)) < 0)
293 Debug (1, "unknown ABI marker: ABI=%u, context=%u\n",
294 c
->abi_marker
>> 8, c
->abi_marker
& 0xff);
297 Debug (12, "sigcontext_addr=%lx (ret=%d)\n",
298 (unsigned long) c
->sigcontext_addr
, ret
);
300 c
->sigcontext_off
= c
->sigcontext_addr
- c
->sp
;
302 /* update the IP cache: */
303 if ((ret
= ia64_get (c
, c
->loc
[IA64_REG_IP
], &ip
)) < 0)
307 /* end of frame-chain reached */
311 num_regs
= (c
->cfm
>> 7) & 0x7f; /* size of locals */
313 if (!IA64_IS_NULL_LOC (c
->loc
[IA64_REG_BSP
]))
315 ret
= check_rbs_switch (c
);
320 c
->bsp
= rse_skip_regs (c
->bsp
, -num_regs
);
325 if (c
->ip
== prev_ip
&& c
->sp
== prev_sp
&& c
->bsp
== prev_bsp
)
327 Dprintf ("%s: ip, sp, and bsp unchanged; stopping here (ip=0x%lx)\n",
328 __FUNCTION__
, (long) ip
);
329 return -UNW_EBADFRAME
;
332 /* as we unwind, the saved ar.unat becomes the primary unat: */
333 c
->loc
[IA64_REG_PRI_UNAT_MEM
] = c
->loc
[IA64_REG_UNAT
];
335 /* restore the predicates: */
336 ret
= ia64_get (c
, c
->loc
[IA64_REG_PR
], &c
->pr
);
346 unw_step (unw_cursor_t
*cursor
)
348 struct cursor
*c
= (struct cursor
*) cursor
;
351 Debug (1, "(cursor=%p, ip=0x%016lx)\n", c
, (unsigned long) c
->ip
);
353 if ((ret
= ia64_find_save_locs (c
)) >= 0
354 && (ret
= update_frame_state (c
)) >= 0)
355 ret
= (c
->ip
== 0) ? 0 : 1;
357 Debug (2, "returning %d (ip=0x%016lx)\n", ret
, (unsigned long) c
->ip
);