Re: [Qemu-devel] [PATCH stable] tci: Fix for AREG0 free mode

[Stefan Weil <sw@weilnetz.de>]

Am 18.09.2012 22:43, schrieb Stefan Weil:
> Support for helper functions with 5 arguments was missing
> in the code generator and in the interpreter.
>
> There is no need to pass the constant TCG_AREG0 from the
> code generator to the interpreter. Remove that code for
> the INDEX_op_qemu_st* opcodes.
>
> Signed-off-by: Stefan Weil<sw@weilnetz.de>
> ---
>
> This patch is also needed for stable-1.2.
>
> Regards
>
> Stefan Weil
>

Ping? Maybe my mail was misleading: the patch is needed
to get a working TCI for QEMU stable-1.2 _and_ for the latest QEMU.

This is a bug fix, so I expect that a pull request is not needed.

Thanks,

Stefan


>
>   tcg/tci/tcg-target.c |   10 +++++-----
>   tci.c                |   13 +++++++++----
>   2 files changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/tcg/tci/tcg-target.c b/tcg/tci/tcg-target.c
> index 3f4a24b..d272a90 100644
> --- a/tcg/tci/tcg-target.c
> +++ b/tcg/tci/tcg-target.c
> @@ -300,7 +300,7 @@ static const int tcg_target_reg_alloc_order[] = {
>   #endif
>   };
>
> -#if MAX_OPC_PARAM_IARGS != 4
> +#if MAX_OPC_PARAM_IARGS != 5
>   # error Fix needed, number of supported input arguments changed!
>   #endif
>
> @@ -309,16 +309,18 @@ static const int tcg_target_call_iarg_regs[] = {
>       TCG_REG_R1,
>       TCG_REG_R2,
>       TCG_REG_R3,
> -#if TCG_TARGET_REG_BITS == 32
> -    /* 32 bit hosts need 2 * MAX_OPC_PARAM_IARGS registers. */
>   #if 0 /* used for TCG_REG_CALL_STACK */
>       TCG_REG_R4,
>   #endif
>       TCG_REG_R5,
> +#if TCG_TARGET_REG_BITS == 32
> +    /* 32 bit hosts need 2 * MAX_OPC_PARAM_IARGS registers. */
>       TCG_REG_R6,
>       TCG_REG_R7,
>   #if TCG_TARGET_NB_REGS>= 16
>       TCG_REG_R8,
> +    TCG_REG_R9,
> +    TCG_REG_R10,
>   #else
>   # error Too few input registers available
>   #endif
> @@ -798,7 +800,6 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
>       case INDEX_op_qemu_st8:
>       case INDEX_op_qemu_st16:
>       case INDEX_op_qemu_st32:
> -        tcg_out_r(s, TCG_AREG0);
>           tcg_out_r(s, *args++);
>           tcg_out_r(s, *args++);
>   #if TARGET_LONG_BITS>  TCG_TARGET_REG_BITS
> @@ -809,7 +810,6 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
>   #endif
>           break;
>       case INDEX_op_qemu_st64:
> -        tcg_out_r(s, TCG_AREG0);
>           tcg_out_r(s, *args++);
>   #if TCG_TARGET_REG_BITS == 32
>           tcg_out_r(s, *args++);
> diff --git a/tci.c b/tci.c
> index ce8a988..a4f7b78 100644
> --- a/tci.c
> +++ b/tci.c
> @@ -36,17 +36,19 @@
>           tcg_abort(); \
>       } while (0)
>
> -#if MAX_OPC_PARAM_IARGS != 4
> +#if MAX_OPC_PARAM_IARGS != 5
>   # error Fix needed, number of supported input arguments changed!
>   #endif
>   #if TCG_TARGET_REG_BITS == 32
>   typedef uint64_t (*helper_function)(tcg_target_ulong, tcg_target_ulong,
>                                       tcg_target_ulong, tcg_target_ulong,
>                                       tcg_target_ulong, tcg_target_ulong,
> +                                    tcg_target_ulong, tcg_target_ulong,
>                                       tcg_target_ulong, tcg_target_ulong);
>   #else
>   typedef uint64_t (*helper_function)(tcg_target_ulong, tcg_target_ulong,
> -                                    tcg_target_ulong, tcg_target_ulong);
> +                                    tcg_target_ulong, tcg_target_ulong,
> +                                    tcg_target_ulong);
>   #endif
>
>   /* TCI can optionally use a global register variable for env. */
> @@ -489,14 +491,17 @@ tcg_target_ulong tcg_qemu_tb_exec(CPUArchState *cpustate, uint8_t *tb_ptr)
>                                             tci_read_reg(TCG_REG_R5),
>                                             tci_read_reg(TCG_REG_R6),
>                                             tci_read_reg(TCG_REG_R7),
> -                                          tci_read_reg(TCG_REG_R8));
> +                                          tci_read_reg(TCG_REG_R8),
> +                                          tci_read_reg(TCG_REG_R9),
> +                                          tci_read_reg(TCG_REG_R10));
>               tci_write_reg(TCG_REG_R0, tmp64);
>               tci_write_reg(TCG_REG_R1, tmp64>>  32);
>   #else
>               tmp64 = ((helper_function)t0)(tci_read_reg(TCG_REG_R0),
>                                             tci_read_reg(TCG_REG_R1),
>                                             tci_read_reg(TCG_REG_R2),
> -                                          tci_read_reg(TCG_REG_R3));
> +                                          tci_read_reg(TCG_REG_R3),
> +                                          tci_read_reg(TCG_REG_R5));
>               tci_write_reg(TCG_REG_R0, tmp64);
>   #endif
>               break;