Do section relocation in architecture backend

2016-11-12 23:16:06 +08:00
parent 60374d01ae
commit cb273fdad8
9 changed files with 552 additions and 490 deletions
--- a/c67-link.c
+++ b/c67-link.c
@ -0,0 +1,35 @@
+#include "tcc.h"
+#define HAVE_SECTION_RELOC
+
+void relocate_init(Section *sr) {}
+
+void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
+{
+    switch(type) {
+        case R_C60_32:
+            *(int *)ptr += val;
+            break;
+        case R_C60LO16:
+            {
+                uint32_t orig;
+
+                /* put the low 16 bits of the absolute address add to what is
+                   already there */
+                orig  =   ((*(int *)(ptr  )) >> 7) & 0xffff;
+                orig |=  (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16;
+
+                /* patch both at once - assumes always in pairs Low - High */
+                *(int *) ptr    = (*(int *) ptr    & (~(0xffff << 7)) ) |
+                                   (((val+orig)      & 0xffff) << 7);
+                *(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) |
+                                  ((((val+orig)>>16) & 0xffff) << 7);
+            }
+            break;
+        case R_C60HI16:
+            break;
+        default:
+            fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
+                    type, (unsigned) addr, ptr, (unsigned) val);
+            break;
+    }
+}