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5l/6l/8l: add a DT_DEBUG dynamic tag to a dynamic ELF binary

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This requires making the .dynamic section writable, as the
dynamic linker will change the value of the DT_DEBUG tag at
runtime.  The DT_DEBUG tag is used by gdb to find all loaded
shared libraries.

R=rsc
CC=golang-dev
https://golang.org/cl/5189044
This commit is contained in:
Ian Lance Taylor 2011-10-04 21:25:11 -07:00
parent 0b534bc9c3
commit a55de2ba61
3 changed files with 8 additions and 3 deletions
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3
src/cmd/5l/asm.c
View File

@ -232,7 +232,7 @@ doelf(void)
/* define dynamic elf table */ /* define dynamic elf table */
s = lookup(".dynamic", 0); s = lookup(".dynamic", 0);
s->reachable = 1; s->reachable = 1;
s->type = SELFROSECT; s->type = SELFSECT; // writable
/* /*
* .dynamic table * .dynamic table
@ -251,6 +251,7 @@ doelf(void)
elfwritedynent(s, DT_PLTREL, DT_REL); elfwritedynent(s, DT_PLTREL, DT_REL);
elfwritedynentsymsize(s, DT_PLTRELSZ, lookup(".rel.plt", 0)); elfwritedynentsymsize(s, DT_PLTRELSZ, lookup(".rel.plt", 0));
elfwritedynentsym(s, DT_JMPREL, lookup(".rel.plt", 0)); elfwritedynentsym(s, DT_JMPREL, lookup(".rel.plt", 0));
elfwritedynent(s, DT_DEBUG, 0);
elfwritedynent(s, DT_NULL, 0); elfwritedynent(s, DT_NULL, 0);
} }
} }

4
src/cmd/6l/asm.c
View File

@ -649,7 +649,7 @@ doelf(void)
/* define dynamic elf table */ /* define dynamic elf table */
s = lookup(".dynamic", 0); s = lookup(".dynamic", 0);
s->reachable = 1; s->reachable = 1;
s->type = SELFROSECT; s->type = SELFSECT; // writable
/* /*
* .dynamic table * .dynamic table
@ -670,6 +670,8 @@ doelf(void)
elfwritedynentsymsize(s, DT_PLTRELSZ, lookup(".rela.plt", 0)); elfwritedynentsymsize(s, DT_PLTRELSZ, lookup(".rela.plt", 0));
elfwritedynentsym(s, DT_JMPREL, lookup(".rela.plt", 0)); elfwritedynentsym(s, DT_JMPREL, lookup(".rela.plt", 0));
elfwritedynent(s, DT_DEBUG, 0);
// Do not write DT_NULL. elfdynhash will finish it. // Do not write DT_NULL. elfdynhash will finish it.
} }
} }

4
src/cmd/8l/asm.c
View File

@ -607,7 +607,7 @@ doelf(void)
/* define dynamic elf table */ /* define dynamic elf table */
s = lookup(".dynamic", 0); s = lookup(".dynamic", 0);
s->reachable = 1; s->reachable = 1;
s->type = SELFROSECT; s->type = SELFSECT; // writable
/* /*
* .dynamic table * .dynamic table
@ -627,6 +627,8 @@ doelf(void)
elfwritedynentsymsize(s, DT_PLTRELSZ, lookup(".rel.plt", 0)); elfwritedynentsymsize(s, DT_PLTRELSZ, lookup(".rel.plt", 0));
elfwritedynentsym(s, DT_JMPREL, lookup(".rel.plt", 0)); elfwritedynentsym(s, DT_JMPREL, lookup(".rel.plt", 0));
elfwritedynent(s, DT_DEBUG, 0);
// Do not write DT_NULL. elfdynhash will finish it. // Do not write DT_NULL. elfdynhash will finish it.
} }
} }