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Re: [Qemu-devel] [RFC] target/mips: Initial support for MIPS R5900
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [RFC] target/mips: Initial support for MIPS R5900 |
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Date: |
Wed, 1 Aug 2018 09:54:48 -0400 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 08/01/2018 09:39 AM, Fredrik Noring wrote:
> Can QEMU be instructed to emulate
> the FPU only for Linux user space programs as opposed to hardware emulation?
Yes, that can be done. I would suggest something like
/*
* Hardware traps to the operating system for emulation.
* For user-only, qemu is the operating system, so we
* emulate the trap and emulate by simply emulating the
* instruction directly.
*/
#ifdef CONFIG_USER_ONLY
# define CP0C1_FP_USER_ONLY (1 << CP0C1_FP)
#else
# define CP0C1_FP_USER_ONLY 0
#endif
and include that in your initialization of CP0_Config1.
r~