kernel: munmap syscall

kernel-src/arch/x86-64/syscall.asm

@@ -14,6 +14,7 @@ extern syscall_fork
 extern syscall_execve
 extern syscall_exit
 extern syscall_waitpid
+extern syscall_munmap
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -30,7 +31,8 @@ dq syscall_fork
 dq syscall_execve
 dq syscall_exit
 dq syscall_waitpid
-syscallcount equ 15
+dq syscall_munmap
+syscallcount equ 16
 section .text
 global arch_syscall_entry
 ; on entry:

kernel-src/sys/syscalls/munmap.c

@@ -0,0 +1,27 @@
+#include <kernel/syscalls.h>
+#include <kernel/vmm.h>
+#include <errno.h>
+
+syscallret_t syscall_munmap(context_t *ctx, void *addr, size_t length) {
+	syscallret_t ret = {
+		.ret = -1,
+		.errno = 0
+	};
+
+	if (addr > USERSPACE_END) {
+		ret.errno = EFAULT;
+		return ret;
+	}
+
+	if (length == 0 || length % PAGE_SIZE > 0) {
+		ret.errno = EINVAL;
+		return ret;
+	}
+
+	vmm_unmap(addr, length / PAGE_SIZE, 0);
+
+	ret.ret = 0;
+	ret.errno = 0;
+
+	return ret;
+}

patches/mlibc/jinx-working-patch.patch

@@ -133,7 +133,7 @@ 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..afd1ebc
+index 0000000..601407e
 --- /dev/null
 +++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
 @@ -0,0 +1,193 @@
@@ -314,8 +314,8 @@ index 0000000..afd1ebc
 +	}
 +
 +	int sys_vm_unmap(void *pointer, size_t size) {
-+		// TODO UNSTUB
-+		return ENOSYS;
++		long ret;
++		return syscall(SYSCALL_MUNMAP, &ret, (uintptr_t)pointer, size);
 +	}
 +	
 +	int sys_isatty(int fd) {
@@ -349,10 +349,10 @@ 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..43c4367
+index 0000000..1562c23
 --- /dev/null
 +++ mlibc-workdir/sysdeps/astral/include/astral/syscall.h
-@@ -0,0 +1,38 @@
+@@ -0,0 +1,39 @@
 +#ifndef _SYSCALL_H_INCLUDE
 +#define _SYSCALL_H_INCLUDE
 +
@@ -371,6 +371,7 @@ index 0000000..43c4367
 +#define SYSCALL_EXECVE 12
 +#define SYSCALL_EXIT 13
 +#define SYSCALL_WAITPID 14
++#define SYSCALL_MUNMAP 15
 +
 +#include <stddef.h>
 +#include <stdint.h>