diff options
| -rw-r--r-- | 04_dynld_nostd/dynld.c | 62 |
1 files changed, 23 insertions, 39 deletions
diff --git a/04_dynld_nostd/dynld.c b/04_dynld_nostd/dynld.c index 30e60d5..9b14590 100644 --- a/04_dynld_nostd/dynld.c +++ b/04_dynld_nostd/dynld.c @@ -9,10 +9,7 @@ #include <stdbool.h> #include <stdint.h> - -/// ---------------- -/// Global Constants -/// ---------------- +// {{{ Global constans enum { // Hard-coded page size. @@ -23,10 +20,8 @@ enum { MAX_NEEDED = 1, }; - -/// -------- -/// Execinfo -/// -------- +// }}} +// {{{ Execinfo typedef struct { uint64_t argc; // Number of commandline arguments. @@ -61,10 +56,8 @@ ExecInfo get_exec_info(const uint64_t* prctx) { return info; } - -/// --- -/// Dso -/// --- +// }}} +// {{{ Dso typedef struct { uint8_t* base; // Base address. @@ -204,10 +197,8 @@ const Elf64Rela* get_reloca(const Dso* dso, const uint64_t idx) { return (const Elf64Rela*)(dso->base + dso->dynamic[DT_RELA]) + idx; } - -/// ----------- -/// Init & Fini -/// ----------- +// }}} +// {{{ Init & Fini typedef void (*initfptr)(); @@ -239,10 +230,8 @@ static void fini(const Dso* dso) { } } - -/// ------------- -/// Symbol lookup -/// ------------- +// }}} +// {{{ Symbol lookup int strcmp(const char* s1, const char* s2) { while (*s1 == *s2 && *s1) { @@ -275,10 +264,8 @@ void* lookup_sym(const Dso* dso, const char* sym_name) { return 0; } - -/// ----------------------------- -/// Map Shared Library Dependency -/// ----------------------------- +// }}} +// {{{ Map Shared Library Dependency Dso map_dependency(const char* dependency) { // For simplicity we only search for SO dependencies in the current working dir. @@ -386,10 +373,8 @@ Dso map_dependency(const char* dependency) { return dso; } - -/// ------------------- -/// Resolve relocations -/// ------------------- +// }}} +// {{{ Resolve relocations struct LinkMap { const Dso* dso; // Pointer to Dso list object. @@ -466,10 +451,8 @@ static void resolve_relocs(const Dso* dso, const LinkMap* map) { } } - -/// ------------------------------ -/// Dynamic Linking (lazy resolve) -/// ------------------------------ +// }}} +// {{{ Dynamic Linking (lazy resolve) // Mark `dynresolve_entry` as `naked` because we want to fully control the // stack layout. @@ -496,10 +479,8 @@ __attribute__((used)) __attribute__((unused)) static void dynresolve(uint64_t go got1, reloc_idx); } - -/// --------- -/// Setup GOT -/// --------- +// }}} +// {{{ Setup GOT void setup_got(const Dso* dso) { // GOT entries {0, 1, 2} have special meaning for the dynamic link process. @@ -540,10 +521,9 @@ void setup_got(const Dso* dso) { } } +// }}} -/// ------------------------- -/// Dynamic Linker Entrypoint -/// ------------------------- +// {{{ Dynamic Linker Entrypoint void dl_entry(const uint64_t* prctx) { // Parse SystemV ABI block. @@ -608,3 +588,7 @@ void dl_entry(const uint64_t* prctx) { _exit(0); } + +// }}} + +// vim:fdm=marker |