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6l, 8l: fix Mach-O binaries with many dynamic libraries

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R=ken2
CC=golang-dev
https://golang.org/cl/4529084
This commit is contained in:
Russ Cox 2011-05-24 19:50:13 -04:00
parent 0b209b36b6
commit d2b2b3f4a8
4 changed files with 24 additions and 5 deletions
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2
src/cmd/6l/obj.c
View File

@ -177,7 +177,7 @@ main(int argc, char *argv[])
*/
tlsoffset = 0x8a0;
machoinit();
HEADR = MACHORESERVE;
HEADR = INITIAL_MACHO_HEADR;
if(INITRND == -1)
INITRND = 4096;
if(INITTEXT == -1)

2
src/cmd/8l/obj.c
View File

@ -218,7 +218,7 @@ main(int argc, char *argv[])
*/
tlsoffset = 0x468;
machoinit();
HEADR = MACHORESERVE;
HEADR = INITIAL_MACHO_HEADR;
if(INITTEXT == -1)
INITTEXT = 4096+HEADR;
if(INITDAT == -1)

23
src/cmd/ld/macho.c
View File

@ -17,6 +17,14 @@ static MachoSeg seg[16];
static MachoDebug xdebug[16];
static int nload, mload, nseg, ndebug, nsect;
// Amount of space left for adding load commands
// that refer to dynamic libraries. Because these have
// to go in the Mach-O header, we can't just pick a
// "big enough" header size. The initial header is
// one page, the non-dynamic library stuff takes
// up about 1300 bytes; we overestimate that as 2k.
static int load_budget = INITIAL_MACHO_HEADR - 2*1024;
void
machoinit(void)
{
@ -267,6 +275,17 @@ domacho(void)
void
machoadddynlib(char *lib)
{
// Will need to store the library name rounded up
// and 24 bytes of header metadata. If not enough
// space, grab another page of initial space at the
// beginning of the output file.
load_budget -= (strlen(lib)+7)/8*8 + 24;
if(load_budget < 0) {
HEADR += 4096;
INITTEXT += 4096;
load_budget += 4096;
}
if(ndylib%32 == 0) {
dylib = realloc(dylib, (ndylib+32)*sizeof dylib[0]);
if(dylib == nil) {
@ -463,8 +482,8 @@ asmbmacho(void)
}
a = machowrite();
if(a > MACHORESERVE)
diag("MACHORESERVE too small: %d > %d", a, MACHORESERVE);
if(a > HEADR)
diag("HEADR too small: %d > %d", a, HEADR);
}
vlong

2
src/cmd/ld/macho.h
View File

@ -63,7 +63,7 @@ void machoinit(void);
* for Header, PHeaders, and SHeaders.
* May waste some.
*/
#define MACHORESERVE 3*1024
#define INITIAL_MACHO_HEADR 4*1024
enum {
MACHO_CPU_AMD64 = (1<<24)|7,