system/qemu
system/qemu
1
0
Fork 0
mirror of https://gitlab.com/qemu-project/qemu synced 2024-07-23 19:34:41 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

tcg/aarch64: Use full load/store helpers in user-only mode

Browse source 
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 2023-04-02 21:01:53 +00:00
parent 30cc7a7e91
commit e9266ecd8f
1 changed files with 0 additions and 35 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
tcg/aarch64/tcg-target.c.inc
View file

@ -1595,7 +1595,6 @@ typedef struct {
TCGType index_ext;
} HostAddress;
#ifdef CONFIG_SOFTMMU
static const TCGLdstHelperParam ldst_helper_param = {
.ntmp = 1, .tmp = { TCG_REG_TMP }
};
@ -1628,40 +1627,6 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
tcg_out_goto(s, lb->raddr);
return true;
}
#else
static void tcg_out_adr(TCGContext *s, TCGReg rd, const void *target)
{
ptrdiff_t offset = tcg_pcrel_diff(s, target);
tcg_debug_assert(offset == sextract64(offset, 0, 21));
tcg_out_insn(s, 3406, ADR, rd, offset);
}
static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
{
if (!reloc_pc19(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}
tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_X1, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_X0, TCG_AREG0);
/* "Tail call" to the helper, with the return address back inline. */
tcg_out_adr(s, TCG_REG_LR, l->raddr);
tcg_out_goto_long(s, (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.