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Re: [Qemu-devel] [PATCH 2/3] target-mips:enabling of 64 bit user mode an
From: |
Andreas Färber |
Subject: |
Re: [Qemu-devel] [PATCH 2/3] target-mips:enabling of 64 bit user mode and floating point operations MIPS_HFLAG_UX is included in env->hflags so that the address computation for LD instruction does not treated as 32 bit code see gen_op_addr_add() in translate.c |
Date: |
Fri, 09 Dec 2011 01:04:05 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111105 Thunderbird/8.0 |
Thanks for extending the commit description. Please see this for a
template though:
http://live.gnome.org/Git/CommitMessages
Looks like there's an empty line missing between subject and description
(and the space after "target-mips:").
Am 08.12.2011 06:25, schrieb address@hidden:
> From: Khansa Butt <address@hidden>
>
>
> Signed-off-by: Abdul Qadeer <address@hidden>
> ---
> target-mips/translate.c | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/target-mips/translate.c b/target-mips/translate.c
> index d5b1c76..452a63b 100644
> --- a/target-mips/translate.c
> +++ b/target-mips/translate.c
> @@ -12779,6 +12779,10 @@ void cpu_reset (CPUMIPSState *env)
> env->hflags |= MIPS_HFLAG_FPU;
> }
> #ifdef TARGET_MIPS64
> + env->hflags |= MIPS_HFLAG_UX;
So for those of us not knowing mips, it's defined as:
#define MIPS_HFLAG_UX 0x00200 /* 64-bit user mode */
The code above is inside CONFIG_USER_ONLY, so this looks right for n64
but not for n32 ABI.
If you put this into its own patch with a description of
---8<---
target-mips: Enable 64 bit user mode for n64
For user mode n64 ABI emulation, MIPS_HFLAG_UX is included in
env->hflags so that the address computation for LD instruction does not
get treated as 32 bit code, see gen_op_addr_add() in translate.c.
Signed-off-by: Abdul Qadeer <address@hidden>
Signed-off-by: (you)
---8<---
and make it depend on TARGET_ABI_MIPSN64 then I will happily add my
Acked-by.
> + /* if cpu has FPU, MIPS_HFLAG_F64 must be included in env->hflags
> + so that floating point operations can be emulated */
> + env->active_fpu.fcr0 = env->cpu_model->CP1_fcr0;
> if (env->active_fpu.fcr0 & (1 << FCR0_F64)) {
> env->hflags |= MIPS_HFLAG_F64;
> }
Nack. env->active_fpu.fcr0 gets initialized in translate_init.c based on
cpu_model->CR1_fcr0, where FCR0_F64 is set only for 24Kf, 34Kf,
MIPS64R2-generic. TARGET_ABI_MIPSN64 linux-user defaults to 20Kc. So it
seems to rather be an issue of using the right -cpu parameter or
changing the default for n64. [cc'ing Nathan, who introduced the if]
Andreas