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-rw-r--r--05/tcc-0.9.27/arm64-link.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/05/tcc-0.9.27/arm64-link.c b/05/tcc-0.9.27/arm64-link.c
new file mode 100644
index 0000000..59322c5
--- /dev/null
+++ b/05/tcc-0.9.27/arm64-link.c
@@ -0,0 +1,256 @@
+#ifdef TARGET_DEFS_ONLY
+
+#define EM_TCC_TARGET EM_AARCH64
+
+#define R_DATA_32 R_AARCH64_ABS32
+#define R_DATA_PTR R_AARCH64_ABS64
+#define R_JMP_SLOT R_AARCH64_JUMP_SLOT
+#define R_GLOB_DAT R_AARCH64_GLOB_DAT
+#define R_COPY R_AARCH64_COPY
+#define R_RELATIVE R_AARCH64_RELATIVE
+
+#define R_NUM R_AARCH64_NUM
+
+#define ELF_START_ADDR 0x00400000
+#define ELF_PAGE_SIZE 0x1000
+
+#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_AARCH64_ABS32:
+ case R_AARCH64_ABS64:
+ case R_AARCH64_PREL32:
+ case R_AARCH64_MOVW_UABS_G0_NC:
+ case R_AARCH64_MOVW_UABS_G1_NC:
+ case R_AARCH64_MOVW_UABS_G2_NC:
+ case R_AARCH64_MOVW_UABS_G3:
+ case R_AARCH64_ADR_PREL_PG_HI21:
+ case R_AARCH64_ADD_ABS_LO12_NC:
+ case R_AARCH64_ADR_GOT_PAGE:
+ case R_AARCH64_LD64_GOT_LO12_NC:
+ case R_AARCH64_GLOB_DAT:
+ case R_AARCH64_COPY:
+ return 0;
+
+ case R_AARCH64_JUMP26:
+ case R_AARCH64_CALL26:
+ case R_AARCH64_JUMP_SLOT:
+ return 1;
+ }
+
+ tcc_error ("Unknown relocation type: %d", reloc_type);
+ return -1;
+}
+
+/* Returns an enumerator to describe whether 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_AARCH64_PREL32:
+ case R_AARCH64_MOVW_UABS_G0_NC:
+ case R_AARCH64_MOVW_UABS_G1_NC:
+ case R_AARCH64_MOVW_UABS_G2_NC:
+ case R_AARCH64_MOVW_UABS_G3:
+ case R_AARCH64_ADR_PREL_PG_HI21:
+ case R_AARCH64_ADD_ABS_LO12_NC:
+ case R_AARCH64_GLOB_DAT:
+ case R_AARCH64_JUMP_SLOT:
+ case R_AARCH64_COPY:
+ return NO_GOTPLT_ENTRY;
+
+ case R_AARCH64_ABS32:
+ case R_AARCH64_ABS64:
+ case R_AARCH64_JUMP26:
+ case R_AARCH64_CALL26:
+ return AUTO_GOTPLT_ENTRY;
+
+ case R_AARCH64_ADR_GOT_PAGE:
+ case R_AARCH64_LD64_GOT_LO12_NC:
+ 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;
+ unsigned plt_offset;
+
+ if (s1->output_type == TCC_OUTPUT_DLL)
+ tcc_error("DLLs unimplemented!");
+
+ if (plt->data_offset == 0) {
+ section_ptr_add(plt, 32);
+ }
+ plt_offset = plt->data_offset;
+
+ p = section_ptr_add(plt, 16);
+ write32le(p, got_offset);
+ write32le(p + 4, (uint64_t) got_offset >> 32);
+ 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) {
+ uint64_t plt = s1->plt->sh_addr;
+ uint64_t got = s1->got->sh_addr;
+ uint64_t off = (got >> 12) - (plt >> 12);
+ if ((off + ((uint32_t)1 << 20)) >> 21)
+ tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", off, got, plt);
+ write32le(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]!
+ write32le(p + 4, (0x90000010 | // adrp x16,...
+ (off & 0x1ffffc) << 3 | (off & 3) << 29));
+ write32le(p + 8, (0xf9400211 | // ldr x17,[x16,#...]
+ (got & 0xff8) << 7));
+ write32le(p + 12, (0x91000210 | // add x16,x16,#...
+ (got & 0xfff) << 10));
+ write32le(p + 16, 0xd61f0220); // br x17
+ write32le(p + 20, 0xd503201f); // nop
+ write32le(p + 24, 0xd503201f); // nop
+ write32le(p + 28, 0xd503201f); // nop
+ p += 32;
+ while (p < p_end) {
+ uint64_t pc = plt + (p - s1->plt->data);
+ uint64_t addr = got + read64le(p);
+ uint64_t off = (addr >> 12) - (pc >> 12);
+ if ((off + ((uint32_t)1 << 20)) >> 21)
+ tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", off, addr, pc);
+ write32le(p, (0x90000010 | // adrp x16,...
+ (off & 0x1ffffc) << 3 | (off & 3) << 29));
+ write32le(p + 4, (0xf9400211 | // ldr x17,[x16,#...]
+ (addr & 0xff8) << 7));
+ write32le(p + 8, (0x91000210 | // add x16,x16,#...
+ (addr & 0xfff) << 10));
+ write32le(p + 12, 0xd61f0220); // br x17
+ p += 16;
+ }
+ }
+}
+
+void relocate_init(Section *sr) {}
+
+void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val)
+{
+ int sym_index = ELFW(R_SYM)(rel->r_info);
+#ifdef DEBUG_RELOC
+ ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
+#endif
+
+ switch(type) {
+ case R_AARCH64_ABS64:
+ write64le(ptr, val);
+ return;
+ case R_AARCH64_ABS32:
+ write32le(ptr, val);
+ return;
+ case R_AARCH64_PREL32:
+ write32le(ptr, val - addr);
+ return;
+ case R_AARCH64_MOVW_UABS_G0_NC:
+ write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
+ (val & 0xffff) << 5));
+ return;
+ case R_AARCH64_MOVW_UABS_G1_NC:
+ write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
+ (val >> 16 & 0xffff) << 5));
+ return;
+ case R_AARCH64_MOVW_UABS_G2_NC:
+ write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
+ (val >> 32 & 0xffff) << 5));
+ return;
+ case R_AARCH64_MOVW_UABS_G3:
+ write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
+ (val >> 48 & 0xffff) << 5));
+ return;
+ case R_AARCH64_ADR_PREL_PG_HI21: {
+ uint64_t off = (val >> 12) - (addr >> 12);
+ if ((off + ((uint64_t)1 << 20)) >> 21)
+ tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
+ write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
+ (off & 0x1ffffc) << 3 | (off & 3) << 29));
+ return;
+ }
+ case R_AARCH64_ADD_ABS_LO12_NC:
+ write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
+ (val & 0xfff) << 10));
+ return;
+ case R_AARCH64_JUMP26:
+ case R_AARCH64_CALL26:
+#ifdef DEBUG_RELOC
+ printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
+ (char *) symtab_section->link->data + sym->st_name);
+#endif
+ if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
+ tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed"
+ " (val=%lx, addr=%lx)", val, addr);
+ write32le(ptr, (0x14000000 |
+ (uint32_t)(type == R_AARCH64_CALL26) << 31 |
+ ((val - addr) >> 2 & 0x3ffffff)));
+ return;
+ case R_AARCH64_ADR_GOT_PAGE: {
+ uint64_t off =
+ (((s1->got->sh_addr +
+ s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
+ if ((off + ((uint64_t)1 << 20)) >> 21)
+ tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
+ write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
+ (off & 0x1ffffc) << 3 | (off & 3) << 29));
+ return;
+ }
+ case R_AARCH64_LD64_GOT_LO12_NC:
+ write32le(ptr,
+ ((read32le(ptr) & 0xfff803ff) |
+ ((s1->got->sh_addr +
+ s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
+ return;
+ case R_AARCH64_COPY:
+ return;
+ case R_AARCH64_GLOB_DAT:
+ case R_AARCH64_JUMP_SLOT:
+ /* They don't need addend */
+#ifdef DEBUG_RELOC
+ printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
+ val - rel->r_addend,
+ (char *) symtab_section->link->data + sym->st_name);
+#endif
+ write64le(ptr, val - rel->r_addend);
+ return;
+ case R_AARCH64_RELATIVE:
+#ifdef TCC_TARGET_PE
+ add32le(ptr, val - s1->pe_imagebase);
+#endif
+ /* do nothing */
+ return;
+ default:
+ fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
+ type, (unsigned)addr, ptr, (unsigned)val);
+ return;
+ }
+}
+
+#endif /* !TARGET_DEFS_ONLY */
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