From 9a7173bf69cc1e620f33e2d08550a70d31674a0f Mon Sep 17 00:00:00 2001
From: Shinichiro Hamaji <shinichiro.hamaji _at_ gmail.com>
Date: Fri, 17 Apr 2009 10:17:14 +0900
Subject: [PATCH] x86-64: Fix tcc -run. We need extra memory for PLT and GOT.

Size of the extra buffer is too large for now.
---
 tcc.c    | 31 ++++++++++++++++++++++---------
 tccelf.c |  8 +++++---
 2 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/tcc.c b/tcc.c
index acff2e4c..3a0f7257 100644
--- a/tcc.c
+++ b/tcc.c
@@ -545,6 +545,12 @@ struct TCCState {
 
     /* for tcc_relocate */
     int runtime_added;
+
+#ifdef TCC_TARGET_X86_64
+    /* write PLT and GOT here */
+    char *runtime_plt_and_got;
+    unsigned int runtime_plt_and_got_offset;
+#endif
 };
 
 /* The current value can be: */
@@ -1311,12 +1317,7 @@ Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags)
 
 static void free_section(Section *s)
 {
-#ifdef TCC_TARGET_X86_64
-    /* after tcc_relocate(), some sections share the data buffer.
-       let's check if the data is allocated not to free the shared buffers */
-    if (s->data_allocated)
-#endif
-        tcc_free(s->data);
+    tcc_free(s->data);
 }
 
 /* realloc section and set its content to zero */
@@ -10327,14 +10328,22 @@ int tcc_relocate(TCCState *s1, void *ptr)
         offset = (offset + length + 15) & ~15;
     }
 
+#ifdef TCC_TARGET_X86_64
+    s1->runtime_plt_and_got_offset = 0;
+    s1->runtime_plt_and_got = (char *)(mem + offset);
+    /* double the size of the buffer for got and plt entries
+       XXX: calculate exact size for them? */
+    offset *= 2;
+#endif
+
+    if (0 == mem)
+        return offset + 15;
+
     /* relocate symbols */
     relocate_syms(s1, 1);
     if (s1->nb_errors)
         return -1;
 
-    if (0 == mem)
-        return offset + 15;
-
     /* relocate each section */
     for(i = 1; i < s1->nb_sections; i++) {
         s = s1->sections[i];
@@ -10357,6 +10366,10 @@ int tcc_relocate(TCCState *s1, void *ptr)
         if (s->sh_flags & SHF_EXECINSTR)
             set_pages_executable(ptr, length);
     }
+#ifdef TCC_TARGET_X86_64
+    set_pages_executable(s1->runtime_plt_and_got,
+                         s1->runtime_plt_and_got_offset);
+#endif
     return 0;
 }
 
diff --git a/tccelf.c b/tccelf.c
index 6a26831b..11bb82c7 100644
--- a/tccelf.c
+++ b/tccelf.c
@@ -480,7 +480,8 @@ static void relocate_syms(TCCState *s1, int do_resolve)
 #define JMP_TABLE_ENTRY_SIZE 14
 static unsigned long add_jmp_table(TCCState *s1, unsigned long val)
 {
-    char *p = (char *)section_ptr_add(text_section, JMP_TABLE_ENTRY_SIZE);
+    char *p = s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset;
+    s1->runtime_plt_and_got_offset += JMP_TABLE_ENTRY_SIZE;
     /* jmp *0x0(%rip) */
     p[0] = 0xff;
     p[1] = 0x25;
@@ -491,8 +492,9 @@ static unsigned long add_jmp_table(TCCState *s1, unsigned long val)
 
 static unsigned long add_got_table(TCCState *s1, unsigned long val)
 {
-    unsigned long *p =
-        (unsigned long *)section_ptr_add(text_section, sizeof(void *));
+    unsigned long *p =(unsigned long *)(s1->runtime_plt_and_got +
+                                        s1->runtime_plt_and_got_offset);
+    s1->runtime_plt_and_got_offset += sizeof(void *);
     *p = val;
     return (unsigned long)p;
 }
-- 
2.11.4.GIT