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386-darwin.dylib decompressor chains to user .init_address

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This commit is contained in:
John Reiser 2009-05-20 07:10:14 -07:00
parent 7d38f0e234
commit d7ed2412f6
4 changed files with 2356 additions and 2346 deletions
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9
src/p_mach.cpp
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@ -68,7 +68,8 @@ PackMachBase<T>::PackMachBase(InputFile *f, unsigned cputype, unsigned filetype,
unsigned flavor, unsigned count, unsigned size) :
super(f), my_cputype(cputype), my_filetype(filetype), my_thread_flavor(flavor),
my_thread_state_word_count(count), my_thread_command_size(size),
n_segment(0), rawmseg(NULL), msegcmd(NULL), o_routines_cmd(0)
n_segment(0), rawmseg(NULL), msegcmd(NULL), o_routines_cmd(0),
prev_init_address(0)
{
MachClass::compileTimeAssertions();
bele = N_BELE_CTP::getRTP((const BeLePolicy*) NULL);
@ -570,7 +571,10 @@ void PackDylibI386::pack3(OutputFile *fo, Filter &ft) // append loader
unsigned const zero = 0;
unsigned len = fo->getBytesWritten();
fo->write(&zero, 3& (0u-len));
len += (3& (0u-len)) + 3*sizeof(disp);
len += (3& (0u-len)) + 4*sizeof(disp);
disp = prev_init_address;
fo->write(&disp, sizeof(disp)); // user .init_address
disp = sizeof(mhdro) + mhdro.sizeofcmds + sizeof(l_info) + sizeof(p_info);
fo->write(&disp, sizeof(disp)); // src offset(compressed __TEXT)
@ -915,6 +919,7 @@ bool PackMachBase<T>::canPack()
if (((Mach_segment_command const *)ptr)->cmd ==
Mach_segment_command::LC_ROUTINES) {
o_routines_cmd = (char *)ptr - (char *)rawmseg;
prev_init_address = ((Mach_routines_command const *)ptr)->init_address;
}
ptr += (unsigned) ((Mach_segment_command *)ptr)->cmdsize;
}

1
src/p_mach.h
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@ -501,6 +501,7 @@ protected:
Mach_segment_command *rawmseg; // as input, with sections
Mach_segment_command *msegcmd; // LC_SEGMENT first, without sections
unsigned o_routines_cmd; // file offset to LC_ROUINTES
unsigned prev_init_address;
Mach_header mhdri;
Mach_header mhdro;

4688
src/stub/i386-darwin.dylib-entry.h
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File diff suppressed because it is too large Load Diff

4
src/stub/src/i386-darwin.dylib-entry.S
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@ -36,6 +36,7 @@
/*************************************************************************
// We have been CALLed as a subroutine from dyld; C-language rules apply.
// -4*4+_start: .long offset(user_init_function)
// -3*4+_start: .long offset(&b_info of compressed Mach_headers)
// -2*4+_start: .long length(compressed __TEXT)
// -1*4+_start: .long total_length # of preceding bytes in file
@ -44,6 +45,7 @@
section LEXEC000
_start: .globl _start
//// int3 # for debug only
push eax # space for &user_init_function
pusha
call main // push address of decompress subroutine
decompress:
@ -172,7 +174,9 @@ dy_reloc:
// Copy compressed __TEXT.
push edi # remember start of compressed __TEXT
mov edx,ebx # &total_length
mov eax,[-3*4+ebx] # offset(user_init_function)
sub edx,[ebx] # runtime base address
add eax,edx; mov [(1+2+8)*4 + esp],eax # relocate &user_init_function
mov esi,[-2*4 + ebx]; add esi,edx
mov ecx,[-1*4 + ebx]
rep movsb