basic ELF output

1 files changed, 46 insertions, 7 deletions

diff --git a/obj.c b/obj.c
index 78aab14..68d183f 100644
--- a/obj.c
+++ b/obj.c
@@ -1,27 +1,66 @@
 #include "obj.h"
 #include "common.h"
+#include "ir.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+void elfinit(void);
+void elfaddsym(const char *, int info, enum section, uvlong value, uvlong size);
+void elfreloc(const char *sym, enum relockind, enum section, uint off, vlong addend);
+void elffini(struct wbuf *);
 
 struct objfile objout;
 
+enum { NTEXT = 4<<20 /* 4MiB */ };
+
 void
 objini(const char *file)
 {
-   enum { NTEXT = 4<<20 /* 4MiB */ };
    assert(!objout.file);
    objout.file = file;
    objout.code = objout.textbegin = mapzeros(NTEXT);
    objout.textend = objout.textbegin + NTEXT;
+
+   switch (mctarg->objkind) {
+   case OBJELF: elfinit(); break;
+   }
+}
+
+void
+objdeffunc(const char *nam, bool globl, uint off, uint siz)
+{
+   switch (mctarg->objkind) {
+   case OBJELF:
+      elfaddsym(nam, /*STT_LOCAL/GLOBAL*/globl << 4 | /*STT_FUNC*/2, Stext, off, siz);
+      break;
+   }
+}
+
+void
+objreloc(const char *sym, enum relockind reloc, enum section section, uint off, vlong addend)
+{
+   switch (mctarg->objkind) {
+   case OBJELF:
+      elfreloc(sym, reloc, section, off, addend);
+      break;
+   }
 }
 
 void
 objfini(void)
 {
-   void *popen(char *, char *), pclose(void *);
-   long fwrite(void *, size_t, size_t, void *);
-   void *cmd = popen("ndisasm -b64 -", "w");
-   ioflush(&bstderr); ioflush(&bstdout);
-   fwrite(objout.textbegin, 1, objout.code - objout.textbegin, cmd);
-   pclose(cmd);
+   static char buf[1<<10];
+   struct wbuf out = FDBUF(buf, sizeof buf, open(objout.file, O_WRONLY | O_CREAT | O_TRUNC, 0666));
+   if (out.fd < 0) fatal(NULL, "could not open %'s for writing: %s", objout.file, strerror(errno));
+
+   switch (mctarg->objkind) {
+   case OBJELF: elffini(&out); break;
+   }
+
+   munmap(objout.textbegin, NTEXT);
+   ioflush(&out);
+   close(out.fd);
 }
 
 /* vim:set ts=3 sw=3 expandtab: */