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tcg/ppc: Allow a 32-bit offset to the constant pool 

We recently relaxed the limit of the number of opcodes that can
appear in a TranslationBlock.  In certain cases this has resulted
in relocation overflow.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-01-10 07:31:46 +00:00
parent 4a64e0fd68
commit 030ffe39dd
1 changed files with 39 additions and 28 deletions
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67
tcg/ppc/tcg-target.inc.c
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@ -222,33 +222,6 @@ static inline void tcg_out_bc_noaddr(TCGContext *s, int insn)
tcg_out32(s, insn | retrans);
}
static void patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
tcg_insn_unit *target;
tcg_insn_unit old;
value += addend;
target = (tcg_insn_unit *)value;
switch (type) {
case R_PPC_REL14:
reloc_pc14(code_ptr, target);
break;
case R_PPC_REL24:
reloc_pc24(code_ptr, target);
break;
case R_PPC_ADDR16:
assert(value == (int16_t)value);
old = *code_ptr;
old = deposit32(old, 0, 16, value);
*code_ptr = old;
break;
default:
tcg_abort();
}
}
/* parse target specific constraints */
static const char *target_parse_constraint(TCGArgConstraint *ct,
const char *ct_str, TCGType type)
@ -552,6 +525,43 @@ static const uint32_t tcg_to_isel[] = {
[TCG_COND_GTU] = ISEL | BC_(7, CR_GT),
};
static void patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
tcg_insn_unit *target;
tcg_insn_unit old;
value += addend;
target = (tcg_insn_unit *)value;
switch (type) {
case R_PPC_REL14:
reloc_pc14(code_ptr, target);
break;
case R_PPC_REL24:
reloc_pc24(code_ptr, target);
break;
case R_PPC_ADDR16:
/* We are abusing this relocation type. This points to a pair
of insns, addis + load. If the displacement is small, we
can nop out the addis. */
if (value == (int16_t)value) {
code_ptr[0] = NOP;
old = deposit32(code_ptr[1], 0, 16, value);
code_ptr[1] = deposit32(old, 16, 5, TCG_REG_TB);
} else {
int16_t lo = value;
int hi = value - lo;
assert(hi + lo == value);
code_ptr[0] = deposit32(code_ptr[0], 0, 16, hi >> 16);
code_ptr[1] = deposit32(code_ptr[1], 0, 16, lo);
}
break;
default:
g_assert_not_reached();
}
}
static void tcg_out_mem_long(TCGContext *s, int opi, int opx, TCGReg rt,
TCGReg base, tcg_target_long offset);
@ -690,7 +700,8 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
if (!in_prologue && USE_REG_TB) {
new_pool_label(s, arg, R_PPC_ADDR16, s->code_ptr,
-(intptr_t)s->code_gen_ptr);
tcg_out32(s, LD | TAI(ret, TCG_REG_TB, 0));
tcg_out32(s, ADDIS | TAI(ret, TCG_REG_TB, 0));
tcg_out32(s, LD | TAI(ret, ret, 0));
return;
}