[pk,fesvr] improved proxykernel build system

Now uses a modified MCPPBS.  Add --host=riscv to configure path.

Front-end server now just searches PATH for riscv-pk, so just install the pk
to somewhere in your path.

1 files changed, 129 insertions, 0 deletions

diff --git a/pk/syscall.c b/pk/syscall.c
new file mode 100644
index 0000000..f14c2e4
--- /dev/null
+++ b/pk/syscall.c
@@ -0,0 +1,129 @@
+#include <machine/syscall.h>
+#include <string.h>
+#include <errno.h>
+#include "pk.h"
+#include "file.h"
+#include "frontend.h"
+
+typedef sysret_t (*syscall_t)(long,long,long,long,long);
+
+void sys_exit(int code)
+{
+  frontend_syscall(SYS_exit,code,0,0,0);
+  panic("exit didn't exit!");
+}
+
+sysret_t sys_read(int fd, char* buf, size_t n)
+{
+  sysret_t r = {-1,EBADF};
+  file_t* f = file_get(fd);
+  if(!f)
+    return r;
+
+  return file_read(f,buf,n);
+}
+
+sysret_t sys_write(int fd, const char* buf, size_t n)
+{
+  sysret_t r = {-1,EBADF};
+  file_t* f = file_get(fd);
+  if(!f)
+    return r;
+
+  return file_write(f,buf,n);
+}
+
+sysret_t sys_open(const char* name, size_t len, int flags, int mode)
+{
+  sysret_t ret = file_open(name, len, flags, mode);
+  if(ret.result == -1)
+    return ret;
+
+  if((ret.result = file_dup((file_t*)ret.result)) == -1)
+    ret.err = ENOMEM;
+
+  return ret;
+}
+
+sysret_t sys_close(int fd)
+{
+  return (sysret_t){fd_close(fd),EBADF};
+}
+
+sysret_t sys_fstat(int fd, void* st)
+{
+  sysret_t r = {-1,EBADF};
+  file_t* f = file_get(fd);
+  if(!f)
+    return r;
+
+  return file_stat(f,st);
+}
+
+sysret_t sys_lseek(int fd, size_t ptr, int dir)
+{
+  sysret_t r = {-1,EBADF};
+  file_t* f = file_get(fd);
+  if(!f)
+    return r;
+
+  return file_lseek(f,ptr,dir);
+}
+
+sysret_t sys_stat(const char* name, size_t len, void* st)
+{
+  return frontend_syscall(SYS_stat,(long)name,len,(long)st,0);
+}
+
+sysret_t sys_lstat(const char* name, size_t len, void* st)
+{
+  return frontend_syscall(SYS_lstat,(long)name,len,(long)st,0);
+}
+
+sysret_t sys_link(const char* old_name, size_t old_len,
+                  const char* new_name, size_t new_len)
+{
+  return frontend_syscall(SYS_link,(long)old_name,old_len,
+                                   (long)new_name,new_len);
+}
+
+sysret_t sys_unlink(const char* name, size_t len)
+{
+  return frontend_syscall(SYS_unlink,(long)name,len,0,0);
+}
+
+void handle_syscall(trapframe_t* tf)
+{
+  const static void* syscall_table[] = {
+    [SYS_exit] = sys_exit,
+    [SYS_read] = sys_read,
+    [SYS_write] = sys_write,
+    [SYS_open] = sys_open,
+    [SYS_close] = sys_close,
+    [SYS_fstat] = sys_fstat,
+    [SYS_lseek] = sys_lseek,
+    [SYS_stat] = sys_stat,
+    [SYS_lstat] = sys_lstat,
+    [SYS_link] = sys_link,
+    [SYS_unlink] = sys_unlink,
+  };
+
+  syscall_t p;
+  unsigned long n = tf->gpr[2];
+  if(n >= sizeof(syscall_table)/sizeof(void*) || !syscall_table[n])
+  {
+    dump_tf(tf);
+    panic("bad syscall #%ld!",n);
+  }
+  else
+    p = (syscall_t)syscall_table[n];
+
+  sysret_t ret = p(tf->gpr[4],tf->gpr[5],tf->gpr[6],tf->gpr[7],n);
+  tf->gpr[2] = ret.result;
+  tf->gpr[3] = ret.result == -1 ? ret.err : 0;
+
+  //printk("syscall %d (%x,%x,%x,%x) from %x == %d\n",n,tf->gpr[4],tf->gpr[5],tf->gpr[6],tf->gpr[7],tf->gpr[31],tf->gpr[2]);
+
+  tf->epc += 4;
+  pop_tf(tf);
+}