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Bug 904646 - Skip NULLs when traversing envp/auxv pointers to let GDB work on Android 4.3; r=glandium

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This commit is contained in:
Jim Chen 2013-08-14 12:54:33 -04:00
parent 57871baf8f
commit 6a7879204c
1 changed files with 6 additions and 0 deletions
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6
mozglue/linker/ElfLoader.cpp
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@ -541,6 +541,7 @@ ElfLoader::DebuggerHelper::DebuggerHelper(): dbg(NULL)
* ...
* envp[n] (likewise)
* NULL
* ... (more NULLs on some platforms such as Android 4.3)
* auxv[0] (first ELF auxiliary vector)
* auxv[1] (second ELF auxiliary vector)
* ...
@ -587,6 +588,11 @@ ElfLoader::DebuggerHelper::DebuggerHelper(): dbg(NULL)
/* Finally, scan forward to find the last environment variable pointer and
* thus the first auxiliary vector. */
while (*scan++);
/* Some platforms have more NULLs here, so skip them if we encounter them */
while (!*scan)
scan++;
AuxVector *auxv = reinterpret_cast<AuxVector *>(scan);
/* The two values of interest in the auxiliary vectors are AT_PHDR and