🆕 运行文件系统中的二进制程序

user/libs/libsystem/Makefile

@@ -0,0 +1,8 @@
+all: libsystem
+# echo $(shell pwd)
+
+
+libsystem: syscall.o
+
+syscall.o: syscall.c
+	gcc $(CFLAGS) -c syscall.c  -o syscall.o

user/libs/libsystem/syscall.c

@@ -0,0 +1,20 @@
+#include "syscall.h"
+
+long syscall_invoke(uint64_t syscall_id, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7)
+{
+    long err_code;
+    __asm__ __volatile__(
+        "movq %2, %%r8 \n\t"
+        "movq %3, %%r9 \n\t"
+        "movq %4, %%r10 \n\t"
+        "movq %5, %%r11 \n\t"
+        "movq %6, %%r12 \n\t"
+        "movq %7, %%r13 \n\t"
+        "movq %8, %%r14 \n\t"
+        "movq %9, %%r15 \n\t"
+        "int $0x80   \n\t"
+        : "=a"(err_code)
+        : "a"(syscall_id), "m"(arg0), "m"(arg1), "m"(arg2), "m"(arg3), "m"(arg4), "m"(arg5), "m"(arg6), "m"(arg7)
+        : "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
+    return err_code;
+}

user/libs/libsystem/syscall.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdint.h>
+
+// 系统调用号
+#define SYS_NOT_EXISTS 0
+#define SYS_PUT_STRING 1
+#define SYS_OPEN 2
+#define SYS_CLOSE 3
+#define SYS_READ 4
+#define SYS_WRITE 5
+#define SYS_LSEEK 6
+#define SYS_FORK 7
+#define SYS_VFORK 8
+
+/**
+ * @brief 用户态系统调用函数
+ *
+ * @param syscall_id
+ * @param arg0
+ * @param arg1
+ * @param arg2
+ * @param arg3
+ * @param arg4
+ * @param arg5
+ * @param arg6
+ * @param arg7
+ * @return long
+ */
+long syscall_invoke(uint64_t syscall_id, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7);