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riscv: fix relocs for global syms

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loads and stores to global symbols need to go via the
GOT (at least for weaks), otherwise -run doesn't work.
Ideally we'd generate GOT relocs (and loads) always and replace
them with PCREL relocs and adds during linking.
This commit is contained in:
Michael Matz 2019-07-22 02:01:04 +02:00
parent 69c77d1597
commit 06184aec53
1 changed files with 40 additions and 14 deletions
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54
riscv64-gen.c
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@ -145,7 +145,7 @@ ST_FUNC void load(int r, SValue *sv)
int bt = sv->type.t & VT_BTYPE;
int align, size = type_size(&sv->type, &align);
if (fr & VT_LVAL) {
int func3, opcode = 0x03;
int func3, opcode = 0x03, doload = 0;
if (is_freg(r)) {
assert(bt == VT_DOUBLE || bt == VT_FLOAT);
opcode = 0x07;
@ -176,12 +176,19 @@ ST_FUNC void load(int r, SValue *sv)
EI(opcode, func3, rr, ireg(v), fc); // l[bhwd][u] RR, 0(V)
} else if (v == VT_CONST && (fr & VT_SYM)) {
static Sym label;
int addend = 0, tempr;
if (1 || ((unsigned)fc + (1 << 11)) >> 12)
addend = fc, fc = 0;
greloca(cur_text_section, sv->sym, ind,
R_RISCV_PCREL_HI20, addend);
int tempr;
if (sv->sym->type.t & VT_STATIC) { // XXX do this per linker relax
greloca(cur_text_section, sv->sym, ind,
R_RISCV_PCREL_HI20, sv->c.i);
fc = 0;
sv->c.i = 0;
} else {
if (((unsigned)fc + (1 << 11)) >> 12)
tcc_error("unimp: large addend for global address");
greloca(cur_text_section, sv->sym, ind,
R_RISCV_GOT_HI20, 0);
doload = 1;
}
if (!label.v) {
label.v = tok_alloc(".L0 ", 4)->tok;
label.type.t = VT_VOID | VT_STATIC;
@ -192,6 +199,12 @@ ST_FUNC void load(int r, SValue *sv)
o(0x17 | (tempr << 7)); // auipc TR, 0 %pcrel_hi(sym)+addend
greloca(cur_text_section, &label, ind,
R_RISCV_PCREL_LO12_I, 0);
if (doload) {
EI(0x03, 3, tempr, tempr, 0); // ld TR, 0(TR)
if (fc)
EI(0x13, 0, tempr, tempr, fc << 20 >> 20); // addi TR, TR, FC
fc = 0;
}
EI(opcode, func3, rr, tempr, fc); // l[bhwd][u] RR, fc(TR)
} else if (v == VT_LLOCAL) {
int br = 8, tempr = is_ireg(r) ? rr : 5;
@ -361,13 +374,20 @@ ST_FUNC void store(int r, SValue *sv)
ptrreg, rr, fc); // s[bhwd] RR, fc(PTRREG)
} else if ((sv->r & ~VT_LVAL_TYPE) == (VT_CONST | VT_SYM | VT_LVAL)) {
static Sym label;
int tempr, addend = 0;
if (1 || ((unsigned)fc + (1 << 11)) >> 12)
addend = fc, fc = 0;
int tempr, doload = 0;
tempr = 5; // t0
greloca(cur_text_section, sv->sym, ind,
R_RISCV_PCREL_HI20, addend);
if (sv->sym->type.t & VT_STATIC) { // XXX do this per linker relax
greloca(cur_text_section, sv->sym, ind,
R_RISCV_PCREL_HI20, sv->c.i);
fc = 0;
sv->c.i = 0;
} else {
if (((unsigned)fc + (1 << 11)) >> 12)
tcc_error("unimp: large addend for global address");
greloca(cur_text_section, sv->sym, ind,
R_RISCV_GOT_HI20, 0);
doload = 1;
}
if (!label.v) {
label.v = tok_alloc(".L0 ", 4)->tok;
label.type.t = VT_VOID | VT_STATIC;
@ -376,7 +396,13 @@ ST_FUNC void store(int r, SValue *sv)
put_extern_sym(&label, cur_text_section, ind, 0);
o(0x17 | (tempr << 7)); // auipc TEMPR, 0 %pcrel_hi(sym)+addend
greloca(cur_text_section, &label, ind,
R_RISCV_PCREL_LO12_S, 0);
doload ? R_RISCV_PCREL_LO12_I : R_RISCV_PCREL_LO12_S, 0);
if (doload) {
EI(0x03, 3, tempr, tempr, 0); // ld TR, 0(TR)
if (fc)
EI(0x13, 0, tempr, tempr, fc << 20 >> 20); // addi TR, TR, FC
fc = 0;
}
if (is_freg(r))
ES(0x27, size == 4 ? 2 : 3, tempr, rr, fc); // fs[wd] RR, fc(TEMPR)
else