On Sun, Feb 20, 2000 at 11:19:40PM +0100, Carsten Jacobi wrote:
> The problem is, that EV4 machines seam to behave differently than
> EV5/6 during an illegal opcode or FP forced software handling trap.
Not as much as you think. The issue being that rounding modes
other than nearest are not implemented. So they invoke an illegal
opcode trap.
> +#ifdef CONFIG_ALPHA_EV4
> + if (alpha_fp_emul(regs.pc))
> + return;
> +#else
> /* 21264 (except pass 1) has precise exceptions. */
> if (alpha_fp_emul(regs.pc - 4))
> return;
> +#endif
This part of the patch is incorrect.
> - if (alpha_fp_emul(regs.pc - 4))
> + if (alpha_fp_emul(regs.pc))
> + {
> + /* Increment the PC so that the program in
> + user space continues */
> + regs.pc += 4;
> return;
But this one's right. Applied.
r~
-
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