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arm64: Fix -run

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With -run the call instruction and a defined function can be
far away, if the function is defined in the executable itself,
not in the to be compiled code.  So we always need PLT slots
for -run, not just for undefined symbols.
This commit is contained in:
Michael Matz 2016-10-14 17:32:10 +02:00
parent 7600b03f35
commit 682ecc1745
2 changed files with 12 additions and 22 deletions
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12
arm64-gen.c
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@ -592,23 +592,11 @@ ST_FUNC void store(int r, SValue *sv)
static void arm64_gen_bl_or_b(int b)
{
// Currently TCC's linker does not generate a PLT when TCC is invoked
// with "-run". This means functions can be out of range if we try to
// call them in the usual way. Until the linker is fixed, work around
// this by using R_AARCH64_MOVW_UABS_G* relocations; see arm64_sym.
int avoid_call26 = 1;
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
assert(!b && (vtop->r & VT_SYM));
if (avoid_call26) {
arm64_sym(30, vtop->sym, 0);
o(0xd63f03c0); // blr x30
}
else {
greloc(cur_text_section, vtop->sym, ind, R_AARCH64_CALL26);
o(0x94000000); // bl .
}
}
else
o(0xd61f0000 | (uint32_t)!b << 21 | intr(gv(RC_R30)) << 5); // br/blr
}

6
tccelf.c
View File

@ -826,7 +826,8 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
case R_AARCH64_CALL26:
/* This check must match the one in build_got_entries, testing
if we really need a PLT slot. */
if (sym->st_shndx == SHN_UNDEF)
if (sym->st_shndx == SHN_UNDEF ||
s1->output_type == TCC_OUTPUT_MEMORY)
/* We've put the PLT slot offset into r_addend when generating
it, and that's what we must use as relocation value (adjusted
by section offset of course). */
@ -1427,7 +1428,8 @@ ST_FUNC void build_got_entries(TCCState *s1)
build_got(s1);
sym_index = ELFW(R_SYM)(rel->r_info);
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
if (sym->st_shndx == SHN_UNDEF) {
if (sym->st_shndx == SHN_UNDEF ||
s1->output_type == TCC_OUTPUT_MEMORY) {
unsigned long ofs;
reloc_type = R_AARCH64_JUMP_SLOT;
ofs = put_got_entry(s1, reloc_type, sym->st_size,