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tcg/s390x: Use full load/store helpers in user-only mode

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Instead of using helper_unaligned_{ld,st}, use the full load/store helpers.
This will allow the fast path to increase alignment to implement atomicity
while not immediately raising an alignment exception.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-04-24 14:11:35 +01:00
parent 30feb7ee43
commit 3df73c7e39
1 changed files with 0 additions and 29 deletions
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29
tcg/s390x/tcg-target.c.inc
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@ -1679,7 +1679,6 @@ static void tcg_out_qemu_st_direct(TCGContext *s, MemOp opc, TCGReg data,
}
}
#if defined(CONFIG_SOFTMMU)
static const TCGLdstHelperParam ldst_helper_param = {
.ntmp = 1, .tmp = { TCG_TMP0 }
};
@ -1716,34 +1715,6 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
tgen_gotoi(s, S390_CC_ALWAYS, lb->raddr);
return true;
}
#else
static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
{
if (!patch_reloc(l->label_ptr[0], R_390_PC16DBL,
(intptr_t)tcg_splitwx_to_rx(s->code_ptr), 2)) {
return false;
}
tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_R3, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_R2, TCG_AREG0);
/* "Tail call" to the helper, with the return address back inline. */
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R14, (uintptr_t)l->raddr);
tgen_gotoi(s, S390_CC_ALWAYS, (const void *)(l->is_ld ? helper_unaligned_ld
: helper_unaligned_st));
return true;
}
static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
return tcg_out_fail_alignment(s, l);
}
static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
return tcg_out_fail_alignment(s, l);
}
#endif /* CONFIG_SOFTMMU */
/*
* For softmmu, perform the TLB load and compare.