New upstream version 0.9.27~git20161217.cd9514ab

1 files changed, 246 insertions, 0 deletions

diff --git a/x86_64-link.c b/x86_64-link.c
new file mode 100644
index 0000000..602a8ef
--- /dev/null
+++ b/x86_64-link.c
@@ -0,0 +1,246 @@
+#ifdef TARGET_DEFS_ONLY
+
+#define EM_TCC_TARGET EM_X86_64
+
+/* relocation type for 32 bit data relocation */
+#define R_DATA_32   R_X86_64_32S
+#define R_DATA_PTR  R_X86_64_64
+#define R_JMP_SLOT  R_X86_64_JUMP_SLOT
+#define R_GLOB_DAT  R_X86_64_GLOB_DAT
+#define R_COPY      R_X86_64_COPY
+
+#define R_NUM       R_X86_64_NUM
+
+#define ELF_START_ADDR 0x400000
+#define ELF_PAGE_SIZE  0x200000
+
+#define PCRELATIVE_DLLPLT 1
+#define RELOCATE_DLLPLT 1
+
+#else /* !TARGET_DEFS_ONLY */
+
+#include "tcc.h"
+
+/* Returns 1 for a code relocation, 0 for a data relocation. For unknown
+   relocations, returns -1. */
+int code_reloc (int reloc_type)
+{
+    switch (reloc_type) {
+        case R_X86_64_32:
+        case R_X86_64_32S:
+        case R_X86_64_64:
+        case R_X86_64_GOTPCREL:
+        case R_X86_64_GOTPCRELX:
+        case R_X86_64_REX_GOTPCRELX:
+        case R_X86_64_GOTTPOFF:
+        case R_X86_64_GOT32:
+        case R_X86_64_GLOB_DAT:
+        case R_X86_64_COPY:
+	case R_X86_64_RELATIVE:
+            return 0;
+
+        case R_X86_64_PC32:
+        case R_X86_64_PLT32:
+        case R_X86_64_JUMP_SLOT:
+            return 1;
+    }
+
+    tcc_error ("Unknown relocation type: %d", reloc_type);
+    return -1;
+}
+
+/* Returns an enumerator to describe wether and when the relocation needs a
+   GOT and/or PLT entry to be created. See tcc.h for a description of the
+   different values. */
+int gotplt_entry_type (int reloc_type)
+{
+    switch (reloc_type) {
+        case R_X86_64_GLOB_DAT:
+        case R_X86_64_JUMP_SLOT:
+        case R_X86_64_COPY:
+	case R_X86_64_RELATIVE:
+            return NO_GOTPLT_ENTRY;
+
+        case R_X86_64_32:
+        case R_X86_64_32S:
+        case R_X86_64_64:
+        case R_X86_64_PC32:
+            return AUTO_GOTPLT_ENTRY;
+
+        case R_X86_64_GOTTPOFF:
+            return BUILD_GOT_ONLY;
+
+        case R_X86_64_GOT32:
+        case R_X86_64_GOTPCREL:
+        case R_X86_64_GOTPCRELX:
+	case R_X86_64_REX_GOTPCRELX:
+        case R_X86_64_PLT32:
+            return ALWAYS_GOTPLT_ENTRY;
+    }
+
+    tcc_error ("Unknown relocation type: %d", reloc_type);
+    return -1;
+}
+
+ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr)
+{
+    Section *plt = s1->plt;
+    uint8_t *p;
+    int modrm;
+    unsigned plt_offset, relofs;
+
+    modrm = 0x25;
+
+    /* empty PLT: create PLT0 entry that pushes the library indentifier
+       (GOT + PTR_SIZE) and jumps to ld.so resolution routine
+       (GOT + 2 * PTR_SIZE) */
+    if (plt->data_offset == 0) {
+        p = section_ptr_add(plt, 16);
+        p[0] = 0xff; /* pushl got + PTR_SIZE */
+        p[1] = modrm + 0x10;
+        write32le(p + 2, PTR_SIZE);
+        p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
+        p[7] = modrm;
+        write32le(p + 8, PTR_SIZE * 2);
+    }
+    plt_offset = plt->data_offset;
+
+    /* The PLT slot refers to the relocation entry it needs via offset.
+       The reloc entry is created below, so its offset is the current
+       data_offset */
+    relofs = s1->got->reloc ? s1->got->reloc->data_offset : 0;
+
+    /* Jump to GOT entry where ld.so initially put the address of ip + 4 */
+    p = section_ptr_add(plt, 16);
+    p[0] = 0xff; /* jmp *(got + x) */
+    p[1] = modrm;
+    write32le(p + 2, got_offset);
+    p[6] = 0x68; /* push $xxx */
+    /* On x86-64, the relocation is referred to by _index_ */
+    write32le(p + 7, relofs / sizeof (ElfW_Rel));
+    p[11] = 0xe9; /* jmp plt_start */
+    write32le(p + 12, -(plt->data_offset));
+    return plt_offset;
+}
+
+/* relocate the PLT: compute addresses and offsets in the PLT now that final
+   address for PLT and GOT are known (see fill_program_header) */
+ST_FUNC void relocate_plt(TCCState *s1)
+{
+    uint8_t *p, *p_end;
+
+    if (!s1->plt)
+      return;
+
+    p = s1->plt->data;
+    p_end = p + s1->plt->data_offset;
+
+    if (p < p_end) {
+        int x = s1->got->sh_addr - s1->plt->sh_addr - 6;
+        add32le(p + 2, x);
+        add32le(p + 8, x - 6);
+        p += 16;
+        while (p < p_end) {
+            add32le(p + 2, x + s1->plt->data - p);
+            p += 16;
+        }
+    }
+}
+
+static ElfW_Rel *qrel; /* ptr to next reloc entry reused */
+
+void relocate_init(Section *sr)
+{
+    qrel = (ElfW_Rel *) sr->data;
+}
+
+void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
+{
+    int sym_index, esym_index;
+
+    sym_index = ELFW(R_SYM)(rel->r_info);
+
+    switch (type) {
+        case R_X86_64_64:
+            if (s1->output_type == TCC_OUTPUT_DLL) {
+                esym_index = s1->sym_attrs[sym_index].dyn_index;
+                qrel->r_offset = rel->r_offset;
+                if (esym_index) {
+                    qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64);
+		    qrel->r_addend = rel->r_addend;
+                    qrel++;
+                    break;
+                } else {
+		    qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
+		    qrel->r_addend = read64le(ptr) + val;
+                    qrel++;
+                }
+            }
+            add64le(ptr, val);
+            break;
+        case R_X86_64_32:
+        case R_X86_64_32S:
+            if (s1->output_type == TCC_OUTPUT_DLL) {
+                /* XXX: this logic may depend on TCC's codegen
+                   now TCC uses R_X86_64_32 even for a 64bit pointer */
+                qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
+                /* Use sign extension! */
+                qrel->r_addend = (int)read32le(ptr) + val;
+                qrel++;
+            }
+            add32le(ptr, val);
+            break;
+
+        case R_X86_64_PC32:
+            if (s1->output_type == TCC_OUTPUT_DLL) {
+                /* DLL relocation */
+                esym_index = s1->sym_attrs[sym_index].dyn_index;
+                if (esym_index) {
+                    qrel->r_offset = rel->r_offset;
+                    qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
+                    /* Use sign extension! */
+                    qrel->r_addend = (int)read32le(ptr) + rel->r_addend;
+                    qrel++;
+                    break;
+                }
+            }
+            goto plt32pc32;
+
+        case R_X86_64_PLT32:
+	    /* fallthrough: val already holds the PLT slot address */
+
+	plt32pc32:
+	{
+            long long diff;
+            diff = (long long)val - addr;
+            if (diff < -2147483648LL || diff > 2147483647LL) {
+                tcc_error("internal error: relocation failed");
+            }
+            add32le(ptr, diff);
+        }
+            break;
+        case R_X86_64_GLOB_DAT:
+        case R_X86_64_JUMP_SLOT:
+            /* They don't need addend */
+            write64le(ptr, val - rel->r_addend);
+            break;
+        case R_X86_64_GOTPCREL:
+	case R_X86_64_GOTPCRELX:
+	case R_X86_64_REX_GOTPCRELX:
+            add32le(ptr, s1->got->sh_addr - addr +
+                         s1->sym_attrs[sym_index].got_offset - 4);
+            break;
+        case R_X86_64_GOTTPOFF:
+            add32le(ptr, val - s1->got->sh_addr);
+            break;
+        case R_X86_64_GOT32:
+            /* we load the got offset */
+            add32le(ptr, s1->sym_attrs[sym_index].got_offset);
+            break;
+        case R_X86_64_RELATIVE:
+            /* do nothing */
+            break;
+    }
+}
+
+#endif /* !TARGET_DEFS_ONLY */