diff options
Diffstat (limited to 'qemu/roms/openbios/arch/sparc32/wuf.S')
| -rw-r--r-- | qemu/roms/openbios/arch/sparc32/wuf.S | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/qemu/roms/openbios/arch/sparc32/wuf.S b/qemu/roms/openbios/arch/sparc32/wuf.S deleted file mode 100644 index 853fc7322..000000000 --- a/qemu/roms/openbios/arch/sparc32/wuf.S +++ /dev/null @@ -1,154 +0,0 @@ -/* - * Window fill (underflow) trap, based on code from Sparclinux. - * - * Copyright (C) 1995 David S. Miller - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, - * MA 02110-1301, USA. - */ - -// #include <psr.h> -// #include <asi.h> - -/* Reg_window offsets */ -#define RW_L0 0x00 -#define RW_L1 0x04 -#define RW_L2 0x08 -#define RW_L3 0x0c -#define RW_L4 0x10 -#define RW_L5 0x14 -#define RW_L6 0x18 -#define RW_L7 0x1c -#define RW_I0 0x20 -#define RW_I1 0x24 -#define RW_I2 0x28 -#define RW_I3 0x2c -#define RW_I4 0x30 -#define RW_I5 0x34 -#define RW_I6 0x38 -#define RW_I7 0x3c - -/* Load a register window from the area beginning at %reg. */ -#define LOAD_WINDOW(reg) \ - ldd [%reg + RW_L0], %l0; \ - ldd [%reg + RW_L2], %l2; \ - ldd [%reg + RW_L4], %l4; \ - ldd [%reg + RW_L6], %l6; \ - ldd [%reg + RW_I0], %i0; \ - ldd [%reg + RW_I2], %i2; \ - ldd [%reg + RW_I4], %i4; \ - ldd [%reg + RW_I6], %i6; - -#define WRITE_PAUSE nop; nop; nop; /* Have to do this after %wim/%psr chg */ - -/* Just like the overflow handler we define macros for registers - * with fixed meanings in this routine. - */ -#define t_psr l0 -#define t_pc l1 -#define t_npc l2 -#define t_wim l3 -/* Don't touch the above registers or else you die horribly... */ - -/* Now macros for the available scratch registers in this routine. */ -#define twin_tmp1 l4 -#define twin_tmp2 l5 - - .text - .align 4 - - /* The trap entry point has executed the following: - * - * rd %psr, %l0 - * rd %wim, %l3 - * b fill_window_entry - * andcc %l0, PSR_PS, %g0 - */ - - /* To get an idea of what has just happened to cause this - * trap take a look at this diagram: - * - * 1 2 3 4 <-- Window number - * ---------- - * T O W I <-- Symbolic name - * - * O == the window that execution was in when - * the restore was attempted - * - * T == the trap itself has save'd us into this - * window - * - * W == this window is the one which is now invalid - * and must be made valid plus loaded from the - * stack - * - * I == this window will be the invalid one when we - * are done and return from trap if successful - */ - - /* BEGINNING OF PATCH INSTRUCTIONS */ - - /* On 7-window Sparc the boot code patches fnwin_patch1 - * with the following instruction. - */ - .globl fnwin_patch1_7win, fnwin_patch2_7win -fnwin_patch1_7win: srl %t_wim, 6, %twin_tmp2 -fnwin_patch2_7win: and %twin_tmp1, 0x7f, %twin_tmp1 - /* END OF PATCH INSTRUCTIONS */ - - - .globl fill_window_entry, fnwin_patch1, fnwin_patch2 -fill_window_entry: - /* LOCATION: Window 'T' */ - - /* Compute what the new %wim is going to be if we retrieve - * the proper window off of the stack. - */ - sll %t_wim, 1, %twin_tmp1 -fnwin_patch1: srl %t_wim, 7, %twin_tmp2 - or %twin_tmp1, %twin_tmp2, %twin_tmp1 -fnwin_patch2: and %twin_tmp1, 0xff, %twin_tmp1 - - wr %twin_tmp1, 0x0, %wim /* Make window 'I' invalid */ - - restore %g0, %g0, %g0 /* Restore to window 'O' */ - - /* Trapped from kernel, we trust that the kernel does not - * 'over restore' sorta speak and just grab the window - * from the stack and return. Easy enough. - */ - /* LOCATION: Window 'O' */ - - restore %g0, %g0, %g0 - WRITE_PAUSE - - /* LOCATION: Window 'W' */ - - LOAD_WINDOW(sp) /* Load it up */ - - /* Spin the wheel... */ - save %g0, %g0, %g0 - save %g0, %g0, %g0 - /* I'd like to buy a vowel please... */ - - /* LOCATION: Window 'T' */ - - /* Now preserve the condition codes in %psr, pause, and - * return from trap. This is the simplest case of all. - */ - wr %t_psr, 0x0, %psr - WRITE_PAUSE - - jmp %t_pc - rett %t_npc |