2e85579c34
Changed it so that when the linker generates error messages, they are scribbled away into a buffer that dlfcn and friends can read from. Since the error messages are generetad with snprintf, and snprintf MAY call malloc during some code paths, we now link against a version of libc that does not contain malloc/free/realloc/calloc. We then define malloc and friends in the dynamic loader, and make them abort() if they are ever called. Signed-off-by: Dima Zavin <dima@android.com>
142 lines
5.3 KiB
C
142 lines
5.3 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _LINKER_DEBUG_H_
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#define _LINKER_DEBUG_H_
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#include <stdio.h>
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/* WARNING: For linker debugging only.. Be careful not to leave any of
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* this on when submitting back to repository */
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#define LINKER_DEBUG 0
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#define TRACE_DEBUG 0
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#define DO_TRACE_LOOKUP 0
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#define DO_TRACE_RELO 0
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#define TIMING 0
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#define STATS 0
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#define COUNT_PAGES 0
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/*********************************************************************
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* You shouldn't need to modify anything below unless you are adding
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* more debugging information.
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*
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* To enable/disable specific debug options, change the defines above
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*********************************************************************/
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/*********************************************************************/
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#undef TRUE
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#undef FALSE
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#define TRUE 1
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#define FALSE 0
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/* Only use printf() during debugging. We have seen occasional memory
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* corruption when the linker uses printf().
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*/
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#if LINKER_DEBUG
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extern int debug_verbosity;
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#warning "*** LINKER IS USING printf(); DO NOT CHECK THIS IN ***"
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#define _PRINTVF(v,f,x...) \
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do { \
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(debug_verbosity > (v)) && (printf(x), ((f) && fflush(stdout))); \
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} while (0)
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#else /* !LINKER_DEBUG */
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#define _PRINTVF(v,f,x...) do {} while(0)
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#endif /* LINKER_DEBUG */
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#define PRINT(x...) _PRINTVF(-1, FALSE, x)
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#define INFO(x...) _PRINTVF(0, TRUE, x)
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#define TRACE(x...) _PRINTVF(1, TRUE, x)
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#define WARN(fmt,args...) \
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_PRINTVF(-1, TRUE, "%s:%d| WARNING: " fmt, __FILE__, __LINE__, ## args)
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#define ERROR(fmt,args...) \
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_PRINTVF(-1, TRUE, "%s:%d| ERROR: " fmt, __FILE__, __LINE__, ## args)
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#if TRACE_DEBUG
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#define DEBUG(x...) _PRINTVF(2, TRUE, "DEBUG: " x)
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#else /* !TRACE_DEBUG */
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#define DEBUG(x...) do {} while (0)
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#endif /* TRACE_DEBUG */
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#if LINKER_DEBUG
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#define TRACE_TYPE(t,x...) do { if (DO_TRACE_##t) { TRACE(x); } } while (0)
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#else /* !LINKER_DEBUG */
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#define TRACE_TYPE(t,x...) do {} while (0)
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#endif /* LINKER_DEBUG */
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#if STATS
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#define RELOC_ABSOLUTE 0
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#define RELOC_RELATIVE 1
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#define RELOC_COPY 2
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#define RELOC_SYMBOL 3
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#define NUM_RELOC_STATS 4
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struct _link_stats {
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int reloc[NUM_RELOC_STATS];
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};
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extern struct _link_stats linker_stats;
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#define COUNT_RELOC(type) \
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do { if (type >= 0 && type < NUM_RELOC_STATS) { \
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linker_stats.reloc[type] += 1; \
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} else { \
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PRINT("Unknown reloc stat requested\n"); \
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} \
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} while(0)
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#else /* !STATS */
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#define COUNT_RELOC(type) do {} while(0)
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#endif /* STATS */
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#if TIMING
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#undef WARN
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#define WARN(x...) do {} while (0)
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#endif /* TIMING */
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#if COUNT_PAGES
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extern unsigned bitmask[];
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#define MARK(offset) do { \
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bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \
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} while(0)
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#else
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#define MARK(x) do {} while (0)
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#endif
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#define DEBUG_DUMP_PHDR(phdr, name, pid) do { \
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DEBUG("%5d %s (phdr = 0x%08x)\n", (pid), (name), (unsigned)(phdr)); \
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DEBUG("\t\tphdr->offset = 0x%08x\n", (unsigned)((phdr)->p_offset)); \
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DEBUG("\t\tphdr->p_vaddr = 0x%08x\n", (unsigned)((phdr)->p_vaddr)); \
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DEBUG("\t\tphdr->p_paddr = 0x%08x\n", (unsigned)((phdr)->p_paddr)); \
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DEBUG("\t\tphdr->p_filesz = 0x%08x\n", (unsigned)((phdr)->p_filesz)); \
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DEBUG("\t\tphdr->p_memsz = 0x%08x\n", (unsigned)((phdr)->p_memsz)); \
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DEBUG("\t\tphdr->p_flags = 0x%08x\n", (unsigned)((phdr)->p_flags)); \
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DEBUG("\t\tphdr->p_align = 0x%08x\n", (unsigned)((phdr)->p_align)); \
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} while (0)
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#endif /* _LINKER_DEBUG_H_ */
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