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tcg/s390: fix ld/st with CONFIG_TCG_PASS_AREG0

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The load/store slow path has been broken in e141ab52d:
- We need to move 4 registers for store functions and 3 registers for
  load functions and not the reverse.
- According to the s390x calling convention the arguments of a function
  should be zero extended. This means that the register shift should be
  done with TCG_TYPE_I64 to ensure the higher word is correctly zero
  extended when needed.

I am aware that CONFIG_TCG_PASS_AREG0 is being removed and thus that
this patch can be improved, but doing so means it can also be applied to
the 1.1 and 1.2 stable branches.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aurelien Jarno 2012-09-08 03:45:43 +00:00 committed by Alexander Graf
parent 19b0516fb4
commit 6845df48ce
1 changed files with 7 additions and 7 deletions
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14
tcg/s390/tcg-target.c
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@ -1509,11 +1509,13 @@ static void tcg_prepare_qemu_ldst(TCGContext* s, TCGReg data_reg,
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_R4, mem_index);
#ifdef CONFIG_TCG_PASS_AREG0
/* XXX/FIXME: suboptimal */
tcg_out_mov(s, TCG_TYPE_I32, tcg_target_call_iarg_regs[2],
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[3],
tcg_target_call_iarg_regs[2]);
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[2],
tcg_target_call_iarg_regs[1]);
tcg_out_mov(s, TCG_TYPE_TL, tcg_target_call_iarg_regs[1],
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[1],
tcg_target_call_iarg_regs[0]);
tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0],
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[0],
TCG_AREG0);
#endif
tgen_calli(s, (tcg_target_ulong)qemu_st_helpers[s_bits]);
@ -1521,13 +1523,11 @@ static void tcg_prepare_qemu_ldst(TCGContext* s, TCGReg data_reg,
tcg_out_movi(s, TCG_TYPE_I32, arg1, mem_index);
#ifdef CONFIG_TCG_PASS_AREG0
/* XXX/FIXME: suboptimal */
tcg_out_mov(s, TCG_TYPE_I32, tcg_target_call_iarg_regs[3],
tcg_target_call_iarg_regs[2]);
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[2],
tcg_target_call_iarg_regs[1]);
tcg_out_mov(s, TCG_TYPE_TL, tcg_target_call_iarg_regs[1],
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[1],
tcg_target_call_iarg_regs[0]);
tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0],
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[0],
TCG_AREG0);
#endif
tgen_calli(s, (tcg_target_ulong)qemu_ld_helpers[s_bits]);