Re: [PATCH 21/24] bsd-user/arm/target_arch_signal.h: arm get_mcontext

[Kyle Evans]

On Tue, Oct 19, 2021 at 11:45 AM Warner Losh <imp@bsdimp.com> wrote:
>
> Get the machine context from the CPU state.
>
> Signed-off-by: Stacey Son <sson@FreeBSD.org>
> Signed-off-by: Klye Evans <kevans@FreeBSD.org>
> Signed-off-by: Warner Losh <imp@bsdimp.com>
> ---
>  bsd-user/arm/target_arch_signal.h | 38 +++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>
> diff --git a/bsd-user/arm/target_arch_signal.h 
> b/bsd-user/arm/target_arch_signal.h
> index b421c2522c..302fdc2846 100644
> --- a/bsd-user/arm/target_arch_signal.h
> +++ b/bsd-user/arm/target_arch_signal.h
> @@ -163,4 +163,42 @@ set_sigtramp_args(CPUARMState *regs, int sig, struct 
> target_sigframe *frame,
>      return 0;
>  }
>
> +/*
> + * Compare to arm/arm/machdep.c get_mcontext()
> + * Assumes that the memory is locked if mcp points to user memory.
> + */
> +static inline abi_long get_mcontext(CPUARMState *regs, target_mcontext_t 
> *mcp,
> +        int flags)
> +{
> +    int err = 0;
> +    uint32_t *gr = mcp->__gregs;
> +
> +    gr[TARGET_REG_CPSR] = tswap32(cpsr_read(regs));
> +    if (flags & TARGET_MC_GET_CLEAR_RET) {
> +        gr[TARGET_REG_R0] = 0;
> +        gr[TARGET_REG_CPSR] &= ~CPSR_C;
> +    } else {
> +        gr[TARGET_REG_R0] = tswap32(regs->regs[0]);
> +    }
> +
> +    gr[TARGET_REG_R1] = tswap32(regs->regs[1]);
> +    gr[TARGET_REG_R2] = tswap32(regs->regs[2]);
> +    gr[TARGET_REG_R3] = tswap32(regs->regs[3]);
> +    gr[TARGET_REG_R4] = tswap32(regs->regs[4]);
> +    gr[TARGET_REG_R5] = tswap32(regs->regs[5]);
> +    gr[TARGET_REG_R6] = tswap32(regs->regs[6]);
> +    gr[TARGET_REG_R7] = tswap32(regs->regs[7]);
> +    gr[TARGET_REG_R8] = tswap32(regs->regs[8]);
> +    gr[TARGET_REG_R9] = tswap32(regs->regs[9]);
> +    gr[TARGET_REG_R10] = tswap32(regs->regs[10]);
> +    gr[TARGET_REG_R11] = tswap32(regs->regs[11]);
> +    gr[TARGET_REG_R12] = tswap32(regs->regs[12]);
> +
> +    gr[TARGET_REG_SP] = tswap32(regs->regs[13]);
> +    gr[TARGET_REG_LR] = tswap32(regs->regs[14]);
> +    gr[TARGET_REG_PC] = tswap32(regs->regs[15]);
> +
> +    return err;
> +}
> +
>  #endif /* !_TARGET_ARCH_SIGNAL_H_ */
> --
> 2.32.0
>

Reviewed-by: Kyle Evans <kevans@FreeBSD.org>