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dynamic executables (PIE)

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Allows to create dynamic executables, using the code path
for TCC_OUTPUT_DLL but add an .interp header (plus a FLAGS_1
entry in the dynamic section to make 'readelf' say "PIE")

Introduces TCC_OUTPUT_DYN as alias for TCC_OUTPUT_DLL.
There is no runtime option,  only one to configure:

    ./configure --config-pie

100 insertions(+), 76 deletions(-)
This commit is contained in:
grischka
2022-05-28 21:00:40 +02:00
parent e460f7dbb2
commit ebaa5c81f4
13 changed files with 100 additions and 76 deletions
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18
libtcc.c
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@@ -862,6 +862,10 @@ LIBTCCAPI void tcc_delete(TCCState *s1)
LIBTCCAPI int tcc_set_output_type(TCCState *s, int output_type)
{
#ifdef CONFIG_TCC_PIE
if (output_type == TCC_OUTPUT_EXE)
output_type |= TCC_OUTPUT_DYN;
#endif
s->output_type = output_type;
if (!s->nostdinc) {
@@ -869,6 +873,10 @@ LIBTCCAPI int tcc_set_output_type(TCCState *s, int output_type)
/* -isystem paths have already been handled */
tcc_add_sysinclude_path(s, CONFIG_TCC_SYSINCLUDEPATHS);
}
if (output_type == TCC_OUTPUT_PREPROCESS)
return 0;
#ifdef CONFIG_TCC_BCHECK
if (s->do_bounds_check) {
/* if bound checking, then add corresponding sections */
@@ -905,13 +913,13 @@ LIBTCCAPI int tcc_set_output_type(TCCState *s, int output_type)
#else
/* paths for crt objects */
tcc_split_path(s, &s->crt_paths, &s->nb_crt_paths, CONFIG_TCC_CRTPREFIX);
/* add libc crt1/crti objects */
if ((output_type == TCC_OUTPUT_EXE || output_type == TCC_OUTPUT_DLL) &&
!s->nostdlib) {
if (output_type != TCC_OUTPUT_MEMORY && !s->nostdlib) {
#if TARGETOS_OpenBSD
if (output_type != TCC_OUTPUT_DLL)
tcc_add_crt(s, "crt0.o");
if (output_type == TCC_OUTPUT_DLL)
if (output_type & TCC_OUTPUT_DYN)
tcc_add_crt(s, "crtbeginS.o");
else
tcc_add_crt(s, "crtbegin.o");
@@ -921,7 +929,7 @@ LIBTCCAPI int tcc_set_output_type(TCCState *s, int output_type)
tcc_add_crt(s, "crti.o");
if (s->static_link)
tcc_add_crt(s, "crtbeginT.o");
else if (output_type == TCC_OUTPUT_DLL)
else if (output_type & TCC_OUTPUT_DYN)
tcc_add_crt(s, "crtbeginS.o");
else
tcc_add_crt(s, "crtbegin.o");
@@ -931,7 +939,7 @@ LIBTCCAPI int tcc_set_output_type(TCCState *s, int output_type)
tcc_add_crt(s, "crti.o");
if (s->static_link)
tcc_add_crt(s, "crtbeginT.o");
else if (output_type == TCC_OUTPUT_DLL)
else if (output_type & TCC_OUTPUT_DYN)
tcc_add_crt(s, "crtbeginS.o");
else
tcc_add_crt(s, "crtbegin.o");