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tcg/loongarch64: Support raising sigbus for user-only

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Signed-off-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220106134238.3936163-1-git@xen0n.name>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
WANG Xuerui 2022-01-06 21:42:38 +08:00 committed by Richard Henderson
parent fe1bee3a0a
commit 6f78c7b082
2 changed files with 69 additions and 4 deletions
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71
tcg/loongarch64/tcg-target.c.inc
View file

@ -29,6 +29,8 @@
* THE SOFTWARE.
*/
#include "../tcg-ldst.c.inc"
#ifdef CONFIG_DEBUG_TCG
static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
"zero",
@ -642,8 +644,6 @@ static bool tcg_out_sti(TCGContext *s, TCGType type, TCGArg val,
*/
#if defined(CONFIG_SOFTMMU)
#include "../tcg-ldst.c.inc"
/*
* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* MemOpIdx oi, uintptr_t ra)
@ -825,6 +825,61 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
return tcg_out_goto(s, l->raddr);
}
#else
/*
* Alignment helpers for user-mode emulation
*/
static void tcg_out_test_alignment(TCGContext *s, bool is_ld, TCGReg addr_reg,
unsigned a_bits)
{
TCGLabelQemuLdst *l = new_ldst_label(s);
l->is_ld = is_ld;
l->addrlo_reg = addr_reg;
/*
* Without micro-architecture details, we don't know which of bstrpick or
* andi is faster, so use bstrpick as it's not constrained by imm field
* width. (Not to say alignments >= 2^12 are going to happen any time
* soon, though)
*/
tcg_out_opc_bstrpick_d(s, TCG_REG_TMP1, addr_reg, 0, a_bits - 1);
l->label_ptr[0] = s->code_ptr;
tcg_out_opc_bne(s, TCG_REG_TMP1, TCG_REG_ZERO, 0);
l->raddr = tcg_splitwx_to_rx(s->code_ptr);
}
static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
{
/* resolve label address */
if (!reloc_br_sk16(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}
tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_A1, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_A0, TCG_AREG0);
/* tail call, with the return address back inline. */
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_RA, (uintptr_t)l->raddr);
tcg_out_call_int(s, (const void *)(l->is_ld ? helper_unaligned_ld
: helper_unaligned_st), true);
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 */
/*
@ -887,6 +942,8 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, TCGType type)
MemOp opc;
#if defined(CONFIG_SOFTMMU)
tcg_insn_unit *label_ptr[1];
#else
unsigned a_bits;
#endif
TCGReg base;
@ -903,6 +960,10 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, TCGType type)
data_regl, addr_regl,
s->code_ptr, label_ptr);
#else
a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, true, addr_regl, a_bits);
}
base = tcg_out_zext_addr_if_32_bit(s, addr_regl, TCG_REG_TMP0);
TCGReg guest_base_reg = USE_GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_ZERO;
tcg_out_qemu_ld_indexed(s, data_regl, base, guest_base_reg, opc, type);
@ -941,6 +1002,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args)
MemOp opc;
#if defined(CONFIG_SOFTMMU)
tcg_insn_unit *label_ptr[1];
#else
unsigned a_bits;
#endif
TCGReg base;
@ -958,6 +1021,10 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args)
data_regl, addr_regl,
s->code_ptr, label_ptr);
#else
a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, false, addr_regl, a_bits);
}
base = tcg_out_zext_addr_if_32_bit(s, addr_regl, TCG_REG_TMP0);
TCGReg guest_base_reg = USE_GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_ZERO;
tcg_out_qemu_st_indexed(s, data_regl, base, guest_base_reg, opc);

2
tcg/loongarch64/tcg-target.h
View file

@ -171,9 +171,7 @@ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
#define TCG_TARGET_DEFAULT_MO (0)
#ifdef CONFIG_SOFTMMU
#define TCG_TARGET_NEED_LDST_LABELS
#endif
#define TCG_TARGET_HAS_MEMORY_BSWAP 0