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LibC+LibELF: Move getauxval and AT_* flags to sys/auxv.h

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This commit is contained in:
Idan Horowitz 2021-10-28 00:45:42 +03:00 committed by Andreas Kling
parent f22787dd39
commit f12da0af13
Notes: sideshowbarker 2024-07-18 01:49:17 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/f12da0af130
Pull-request: https://github.com/SerenityOS/serenity/pull/10664
6 changed files with 79 additions and 52 deletions
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1
Userland/Libraries/LibC/CMakeLists.txt
View file

@ -45,6 +45,7 @@ set(LIBC_SOURCES
strings.cpp
stubs.cpp
syslog.cpp
sys/auxv.cpp
sys/file.cpp
sys/mman.cpp
sys/prctl.cpp

13
Userland/Libraries/LibC/stdlib.cpp
View file

@ -180,19 +180,6 @@ inline int generate_unique_filename(char* pattern, Callback callback)
extern "C" {
long getauxval(long type)
{
errno = 0;
auxv_t* auxvp = (auxv_t*)__auxiliary_vector;
for (; auxvp->a_type != AT_NULL; ++auxvp) {
if (auxvp->a_type == type)
return auxvp->a_un.a_val;
}
errno = ENOENT;
return 0;
}
void exit(int status)
{
__cxa_finalize(nullptr);

2
Userland/Libraries/LibC/stdlib.h
View file

@ -98,6 +98,4 @@ int posix_openpt(int flags);
int grantpt(int fd);
int unlockpt(int fd);
long getauxval(long type);
__END_DECLS

25
Userland/Libraries/LibC/sys/auxv.cpp Normal file
View file

@ -0,0 +1,25 @@
/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <errno.h>
#include <sys/auxv.h>
#include <sys/internals.h>
extern "C" {
long getauxval(long type)
{
errno = 0;
auxv_t* auxvp = (auxv_t*)__auxiliary_vector;
for (; auxvp->a_type != AT_NULL; ++auxvp) {
if (auxvp->a_type == type)
return auxvp->a_un.a_val;
}
errno = ENOENT;
return 0;
}
}

52
Userland/Libraries/LibC/sys/auxv.h Normal file
View file

@ -0,0 +1,52 @@
/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <sys/cdefs.h>
__BEGIN_DECLS
#define AT_NULL 0 /* No length, last entry's a_type has this value */
#define AT_IGNORE 1 /* Entry has no meaning, a_un undefined */
#define AT_EXECFD 2 /* a_val contains a file descriptor of the main program image */
#define AT_PHDR 3 /* a_ptr contains pointer to program header table of main program image */
#define AT_PHENT 4 /* a_val holds size of program header table entries */
#define AT_PHNUM 5 /* a_val holds number of program header table entries */
#define AT_PAGESZ 6 /* a_val gives system page size in bytes */
#define AT_BASE 7 /* a_ptr holds base address that Loader was loaded into memory */
#define AT_FLAGS 8 /* a_val holds 1 bit flags. Undefined flags are 0 */
#define AT_ENTRY 9 /* a_ptr holds entry point of the main program */
#define AT_NOTELF 10 /* a_val non-zero if the program is not ELF */
#define AT_UID 11 /* a_val holds real user id of process */
#define AT_EUID 12 /* a_val holds effective user id of process */
#define AT_GID 13 /* a_val holds real group id of process */
#define AT_EGID 14 /* a_val holds effective group id of process */
#define AT_PLATFORM 15 /* a_val points to a string containing platform name */
#define AT_HWCAP 16 /* a_val contains bitmask of CPU features. Equivalent to CPUID 1.EDX*/
#define AT_CLKTCK 17 /* a_val contains frequence at which times() increments. (Re: Spec. What is times()?) */
#define AT_SECURE 23 /* a_val holds 1 if program in secure mode (e.g. suid). Otherwise 0 */
#define AT_BASE_PLATFORM 24 /* a_ptr points to a string identifying base platform name, which might be different from platform (e.g x86_64 when in i386 compat) */
#define AT_RANDOM 25 /* a_ptr points to 16 securely generated random bytes */
#define AT_HWCAP2 26 /* a_val holds extended hw feature mask. Currently 0 */
#define AT_EXECFN 31 /* a_ptr points to filename of executed program */
#define AT_EXE_BASE 32 /* a_ptr holds base address where main program was loaded into memory */
#define AT_EXE_SIZE 33 /* a_val holds the size of the main program in memory */
/* Auxiliary Vector types, from Intel386 ABI ver 1.0 section 2.3.3 */
typedef struct
{
long a_type; /* Note: Extended to long from int, for ease of compatibility w/64 bit */
union {
long a_val;
void* a_ptr;
void (*a_fnc)(); /* In spec, not used */
} a_un;
} auxv_t;
long getauxval(long type);
__END_DECLS

38
Userland/Libraries/LibELF/AuxiliaryVector.h
View file

@ -8,46 +8,10 @@
#include <AK/String.h>
#include <AK/Types.h>
/* Auxiliary Vector types, from Intel386 ABI ver 1.0 section 2.3.3 */
typedef struct
{
long a_type; /* Note: Extended to long from int, for ease of compatibility w/64 bit */
union {
long a_val;
void* a_ptr;
void (*a_fnc)(); /* In spec, not used */
} a_un;
} auxv_t;
#include <sys/auxv.h>
static_assert(sizeof(auxv_t) % sizeof(FlatPtr) == 0);
#define AT_NULL 0 /* No length, last entry's a_type has this value */
#define AT_IGNORE 1 /* Entry has no meaning, a_un undefined */
#define AT_EXECFD 2 /* a_val contains a file descriptor of the main program image */
#define AT_PHDR 3 /* a_ptr contains pointer to program header table of main program image */
#define AT_PHENT 4 /* a_val holds size of program header table entries */
#define AT_PHNUM 5 /* a_val holds number of program header table entries */
#define AT_PAGESZ 6 /* a_val gives system page size in bytes */
#define AT_BASE 7 /* a_ptr holds base address that Loader was loaded into memory */
#define AT_FLAGS 8 /* a_val holds 1 bit flags. Undefined flags are 0 */
#define AT_ENTRY 9 /* a_ptr holds entry point of the main program */
#define AT_NOTELF 10 /* a_val non-zero if the program is not ELF */
#define AT_UID 11 /* a_val holds real user id of process */
#define AT_EUID 12 /* a_val holds effective user id of process */
#define AT_GID 13 /* a_val holds real group id of process */
#define AT_EGID 14 /* a_val holds effective group id of process */
#define AT_PLATFORM 15 /* a_val points to a string containing platform name */
#define AT_HWCAP 16 /* a_val contains bitmask of CPU features. Equivalent to CPUID 1.EDX*/
#define AT_CLKTCK 17 /* a_val contains frequence at which times() increments. (Re: Spec. What is times()?) */
#define AT_SECURE 23 /* a_val holds 1 if program in secure mode (e.g. suid). Otherwise 0 */
#define AT_BASE_PLATFORM 24 /* a_ptr points to a string identifying base platform name, which might be different from platform (e.g x86_64 when in i386 compat) */
#define AT_RANDOM 25 /* a_ptr points to 16 securely generated random bytes */
#define AT_HWCAP2 26 /* a_val holds extended hw feature mask. Currently 0 */
#define AT_EXECFN 31 /* a_ptr points to filename of executed program */
#define AT_EXE_BASE 32 /* a_ptr holds base address where main program was loaded into memory */
#define AT_EXE_SIZE 33 /* a_val holds the size of the main program in memory */
namespace ELF {
struct AuxiliaryValue {