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m68k: Implement backtrace on top of <unwind-link.h>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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@ -16,52 +16,18 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <libc-lock.h>
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#include <dlfcn.h>
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#include <execinfo.h>
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#include <stdlib.h>
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#include <unwind.h>
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#include <unwind-link.h>
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struct trace_arg
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{
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void **array;
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struct unwind_link *unwind_link;
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int cnt, size;
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void *lastfp, *lastsp;
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};
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#ifdef SHARED
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static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *);
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static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *);
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static _Unwind_Ptr (*unwind_getcfa) (struct _Unwind_Context *);
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static _Unwind_Ptr (*unwind_getgr) (struct _Unwind_Context *, int);
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static void *libgcc_handle;
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static void
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init (void)
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{
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libgcc_handle = __libc_dlopen ("libgcc_s.so.2");
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if (libgcc_handle == NULL)
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return;
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unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace");
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unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP");
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unwind_getcfa = __libc_dlsym (libgcc_handle, "_Unwind_GetCFA");
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unwind_getgr = __libc_dlsym (libgcc_handle, "_Unwind_GetGR");
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if (unwind_getip == NULL || unwind_getgr == NULL || unwind_getcfa == NULL)
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{
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unwind_backtrace = NULL;
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__libc_dlclose (libgcc_handle);
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libgcc_handle = NULL;
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}
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}
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#else
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# define unwind_backtrace _Unwind_Backtrace
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# define unwind_getip _Unwind_GetIP
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# define unwind_getcfa _Unwind_GetCFA
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# define unwind_getgr _Unwind_GetGR
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#endif
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static _Unwind_Reason_Code
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backtrace_helper (struct _Unwind_Context *ctx, void *a)
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{
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@ -70,13 +36,16 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
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/* We are first called with address in the __backtrace function.
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Skip it. */
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if (arg->cnt != -1)
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arg->array[arg->cnt] = (void *) unwind_getip (ctx);
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arg->array[arg->cnt]
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= (void *) UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetIP) (ctx);
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if (++arg->cnt == arg->size)
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return _URC_END_OF_STACK;
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/* %fp is DWARF2 register 14 on M68K. */
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arg->lastfp = (void *) unwind_getgr (ctx, 14);
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arg->lastsp = (void *) unwind_getcfa (ctx);
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arg->lastfp
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= (void *) UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetGR) (ctx, 14);
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arg->lastsp
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= (void *) UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetCFA) (ctx);
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return _URC_NO_REASON;
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}
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@ -110,20 +79,19 @@ struct layout
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int
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__backtrace (void **array, int size)
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{
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struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
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struct trace_arg arg =
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{
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.array = array,
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.unwind_link = __libc_unwind_link_get (),
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.size = size,
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.cnt = -1,
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};
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if (size <= 0)
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if (size <= 0 || arg.unwind_link == NULL)
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return 0;
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#ifdef SHARED
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__libc_once_define (static, once);
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__libc_once (once, init);
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if (unwind_backtrace == NULL)
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return 0;
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#endif
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unwind_backtrace (backtrace_helper, &arg);
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UNWIND_LINK_PTR (arg.unwind_link, _Unwind_Backtrace)
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(backtrace_helper, &arg);
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if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
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--arg.cnt;
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@ -146,17 +114,3 @@ __backtrace (void **array, int size)
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}
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weak_alias (__backtrace, backtrace)
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libc_hidden_def (__backtrace)
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#ifdef SHARED
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/* Free all resources if necessary. */
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libc_freeres_fn (free_mem)
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{
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unwind_backtrace = NULL;
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if (libgcc_handle != NULL)
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{
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__libc_dlclose (libgcc_handle);
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libgcc_handle = NULL;
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}
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}
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#endif
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