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kernel: hook new system calls to userland

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Matheus
2023-09-07 15:48:04 -03:00
parent 712aa9fbc0
commit 1520bb4e01
3 changed files with 69 additions and 10 deletions
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patches/mlibc/jinx-working-patch.patch
+57 -6
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@@ -58,6 +58,41 @@ index 3474615..e034881 100644
}
char **backtrace_symbols(void *const *, int) {
diff --git mlibc-clean/options/posix/generic/unistd-stubs.cpp mlibc-workdir/options/posix/generic/unistd-stubs.cpp
index 79feb9a..c32ef5a 100644
--- mlibc-clean/options/posix/generic/unistd-stubs.cpp
+++ mlibc-workdir/options/posix/generic/unistd-stubs.cpp
@@ -547,9 +547,15 @@ ssize_t readlink(const char *__restrict path, char *__restrict buffer, size_t ma
return length;
}
-ssize_t readlinkat(int, const char *__restrict, char *__restrict, size_t) {
- __ensure(!"Not implemented");
- __builtin_unreachable();
+ssize_t readlinkat(int dirfd, const char *__restrict path, char *__restrict buf, size_t bufsiz) {
+ ssize_t num_read;
+
+ MLIBC_CHECK_OR_ENOSYS(mlibc::sys_readlinkat, -1);
+ if(int e = mlibc::sys_readlinkat(dirfd, path, buf, bufsiz, &num_read); e) {
+ errno = e;
+ return -1;
+ }
+ return num_read;
}
int rmdir(const char *path) {
diff --git mlibc-clean/options/posix/include/mlibc/posix-sysdeps.hpp mlibc-workdir/options/posix/include/mlibc/posix-sysdeps.hpp
index 7e06153..390e179 100644
--- mlibc-clean/options/posix/include/mlibc/posix-sysdeps.hpp
+++ mlibc-workdir/options/posix/include/mlibc/posix-sysdeps.hpp
@@ -70,6 +70,7 @@ int sys_close(int fd);
[[gnu::weak]] int sys_statvfs(const char *path, struct statvfs *out);
[[gnu::weak]] int sys_fstatvfs(int fd, struct statvfs *out);
[[gnu::weak]] int sys_readlink(const char *path, void *buffer, size_t max_size, ssize_t *length);
+[[gnu::weak]] int sys_readlinkat(int dirfd, const char *path, void *buffer, size_t max_size, ssize_t *length);
[[gnu::weak]] int sys_rmdir(const char *path);
[[gnu::weak]] int sys_ftruncate(int fd, size_t size);
[[gnu::weak]] int sys_fallocate(int fd, off_t offset, size_t size);
diff --git mlibc-workdir/sysdeps/astral/crt-x86_64/crt0.S mlibc-workdir/sysdeps/astral/crt-x86_64/crt0.S
new file mode 100644
index 0000000..0a0a4a0
@@ -135,10 +170,10 @@ index 0000000..e5b087a
+
diff --git mlibc-workdir/sysdeps/astral/generic/generic.cpp mlibc-workdir/sysdeps/astral/generic/generic.cpp
new file mode 100644
index 0000000..26d9be2
index 0000000..310a6df
--- /dev/null
+++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
@@ -0,0 +1,487 @@
@@ -0,0 +1,501 @@
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+#include <mlibc/all-sysdeps.hpp>
@@ -257,6 +292,16 @@ index 0000000..26d9be2
+ return 0;
+ }
+
+ int sys_utimensat(int dirfd, const char *pathname, const struct timespec times[2], int flags) {
+ long ret;
+ return syscall(SYSCALL_UTIMENSAT, &ret, dirfd, (uint64_t)pathname, (uint64_t)times, flags);
+ }
+
+ int sys_fchownat(int dirfd, const char *pathname, uid_t owner, gid_t group, int flags) {
+ long ret;
+ return syscall(SYSCALL_FCHOWNAT, &ret, dirfd, (uint64_t)pathname, owner, group, flags);
+ }
+
+ int sys_mount(const char *source, const char *target, const char *fstype, unsigned long flags, const void *data) {
+ long ret;
+ return syscall(SYSCALL_MOUNT, &ret, (uint64_t)source, (uint64_t)target, (uint64_t)fstype, flags, (uint64_t)data);
@@ -371,13 +416,17 @@ index 0000000..26d9be2
+ return sys_fchmodat(AT_FDCWD, pathname, mode, 0);
+ }
+
+ int sys_readlink(const char *path, void *buffer, size_t max_size, ssize_t *length) {
+ int sys_readlinkat(int dirfd, const char *path, void *buffer, size_t max_size, ssize_t *length) {
+ long ret;
+ long error = syscall(SYSCALL_READLINKAT, &ret, AT_FDCWD, (uint64_t)path, (uint64_t)buffer, max_size);
+ long error = syscall(SYSCALL_READLINKAT, &ret, dirfd, (uint64_t)path, (uint64_t)buffer, max_size);
+ *length = ret;
+ return error;
+ }
+
+ int sys_readlink(const char *path, void *buffer, size_t max_size, ssize_t *length) {
+ return sys_readlinkat(AT_FDCWD, path, buffer, max_size, length);
+ }
+
+ static int dolink(int oldfd, const char *oldpath, int newfd, const char *newpath, int flags, int type) {
+ long ret;
+ return syscall(SYSCALL_LINKAT, &ret, oldfd, (uint64_t)oldpath, newfd, (uint64_t)newpath, flags, type);
@@ -645,10 +694,10 @@ index 0000000..990eca0
+#endif
diff --git mlibc-workdir/sysdeps/astral/include/astral/syscall.h mlibc-workdir/sysdeps/astral/include/astral/syscall.h
new file mode 100644
index 0000000..2fda766
index 0000000..71460b3
--- /dev/null
+++ mlibc-workdir/sysdeps/astral/include/astral/syscall.h
@@ -0,0 +1,61 @@
@@ -0,0 +1,63 @@
+#ifndef _SYSCALL_H_INCLUDE
+#define _SYSCALL_H_INCLUDE
+
@@ -690,6 +739,8 @@ index 0000000..2fda766
+#define SYSCALL_NANOSLEEP 35
+#define SYSCALL_FTRUNCATE 36
+#define SYSCALL_MOUNT 37
+#define SYSCALL_FCHOWNAT 38
+#define SYSCALL_UTIMENSAT 39
+
+#include <stddef.h>
+#include <stdint.h>