diff options
| -rw-r--r-- | tcg/aarch64/tcg-target.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c index 01ae610cd7..0ed10a9741 100644 --- a/tcg/aarch64/tcg-target.c +++ b/tcg/aarch64/tcg-target.c @@ -56,6 +56,11 @@ static const int tcg_target_call_oarg_regs[1] = { #define TCG_REG_TMP TCG_REG_X30 #ifndef CONFIG_SOFTMMU +/* Note that XZR cannot be encoded in the address base register slot, + as that actaully encodes SP. So if we need to zero-extend the guest + address, via the address index register slot, we need to load even + a zero guest base into a register. */ +#define USE_GUEST_BASE (guest_base != 0 || TARGET_LONG_BITS == 32) #define TCG_REG_GUEST_BASE TCG_REG_X28 #endif @@ -1224,9 +1229,13 @@ static void tcg_out_qemu_ld(TCGContext *s, TCGReg data_reg, TCGReg addr_reg, add_qemu_ldst_label(s, true, oi, ext, data_reg, addr_reg, s->code_ptr, label_ptr); #else /* !CONFIG_SOFTMMU */ - tcg_out_qemu_ld_direct(s, memop, ext, data_reg, - guest_base ? TCG_REG_GUEST_BASE : TCG_REG_XZR, - otype, addr_reg); + if (USE_GUEST_BASE) { + tcg_out_qemu_ld_direct(s, memop, ext, data_reg, + TCG_REG_GUEST_BASE, otype, addr_reg); + } else { + tcg_out_qemu_ld_direct(s, memop, ext, data_reg, + addr_reg, TCG_TYPE_I64, TCG_REG_XZR); + } #endif /* CONFIG_SOFTMMU */ } @@ -1245,9 +1254,13 @@ static void tcg_out_qemu_st(TCGContext *s, TCGReg data_reg, TCGReg addr_reg, add_qemu_ldst_label(s, false, oi, (memop & MO_SIZE)== MO_64, data_reg, addr_reg, s->code_ptr, label_ptr); #else /* !CONFIG_SOFTMMU */ - tcg_out_qemu_st_direct(s, memop, data_reg, - guest_base ? TCG_REG_GUEST_BASE : TCG_REG_XZR, - otype, addr_reg); + if (USE_GUEST_BASE) { + tcg_out_qemu_st_direct(s, memop, data_reg, + TCG_REG_GUEST_BASE, otype, addr_reg); + } else { + tcg_out_qemu_st_direct(s, memop, data_reg, + addr_reg, TCG_TYPE_I64, TCG_REG_XZR); + } #endif /* CONFIG_SOFTMMU */ } @@ -1806,7 +1819,7 @@ static void tcg_target_qemu_prologue(TCGContext *s) CPU_TEMP_BUF_NLONGS * sizeof(long)); #if !defined(CONFIG_SOFTMMU) - if (guest_base) { + if (USE_GUEST_BASE) { tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_GUEST_BASE, guest_base); tcg_regset_set_reg(s->reserved_regs, TCG_REG_GUEST_BASE); } |