diff options
Diffstat (limited to 'libgloss/sparc_leon/locore_svtdisp.S')
| -rw-r--r-- | libgloss/sparc_leon/locore_svtdisp.S | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/locore_svtdisp.S b/libgloss/sparc_leon/locore_svtdisp.S new file mode 100644 index 000000000..44400f234 --- /dev/null +++ b/libgloss/sparc_leon/locore_svtdisp.S @@ -0,0 +1,186 @@ +/* + * Copyright (c) 2011 Aeroflex Gaisler + * + * BSD license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + +/* The traptable has to be the first code in a boot PROM. */ + +#include <asm-leon/head.h> + +#define TRAP(H) mov %psr, %l0; sethi %hi(H), %l4; jmp %l4+%lo(H); nop; +#define TRAPL(H) mov %g0, %l0; sethi %hi(H), %l4; jmp %l4+%lo(H); nop; +#define TRAP_ENTRY(H) rd %psr, %l0; b H; rd %wim, %l3; nop; + +#define WIM_INIT 2 +#ifdef _SOFT_FLOAT +#define PSR_INIT 0x0e0 +#else +#define PSR_INIT 0x10e0 +#endif + +#define NUMREGWINDOWS 8 + +/* Unexcpected trap will halt the processor by forcing it to error state */ +#define BAD_TRAP ta 0; nop; nop; nop; + +/* Software trap. Treat as BAD_TRAP */ +#define SOFT_TRAP BAD_TRAP + +#define TT_MASK 0xff0 // trap type mask from tbr +#define TT_SHL 4 // shift to get a tbr value + + .seg "text" + + /* ------- */ + .weak _start_svt_weak + .set _start_svt_weak,_start_svt_disp + /* ------- */ + + .global _trap_table, cpuinit, _hardreset, _hardreset_svt + .global _fpdis_enable_svt,_fpdis_svt,_window_overflow_svt,_window_underflow_svt + .global _leonbare_irq_entry_svt,_irqcall_svt,_flush_windows_svt,_srmmu_fault_svt,_irqcall_disableirq_svt + .global start, _start_svt_real + +_start_svt_real: + nop + +_start_svt_disp: + rd %tbr, %l3 + rd %psr, %l0 + ! here,locals have been set up as follows: + ! %l0 = psr + ! %l1 = pc + ! %l2 = npc + ! %l3 = tbr + and %l3,TT_MASK,%l3 + srl %l3,TT_SHL,%l3 + +/* +struct get { + int start,end,func; +}; + +struct get table[3] = { + {0,1,..}, + {0,0,0}, +}; + +int gettrap(int nr){ + struct get *p = table; + while((p->start) || (p->end) || (p->func)) { + if (p->start <= nr && p->end >= nr) { + return p->func; + } + p++; + } + return 0; +} + +$sparc-elf-gcc -S gettrap.c -o test.S -O2 +*/ + +#define loc_o0 l3 +#define loc_o1 l4 +#define loc_o2 l5 +#define loc_o3 l6 + + sethi %hi(trap_table), %loc_o2 + or %loc_o2, %lo(trap_table), %loc_o2 + mov %loc_o0, %loc_o3 + ld [%loc_o2], %loc_o1 +.LL13: + cmp %loc_o1, %loc_o3 +.LL12: + bg,a .LL11 + add %loc_o2, 12, %loc_o2 + ld [%loc_o2+4], %loc_o0 + cmp %loc_o0, %loc_o3 + bge,a .LL1 + ld [%loc_o2+8], %loc_o0 + add %loc_o2, 12, %loc_o2 +.LL11: + ld [%loc_o2], %loc_o0 + orcc %loc_o0, 0, %loc_o1 + bne .LL12 + cmp %loc_o1, %loc_o3 + ld [%loc_o2+4], %loc_o0 + cmp %loc_o0, 0 + bne .LL12 + cmp %loc_o1, %loc_o3 + ld [%loc_o2+8], %loc_o0 + cmp %loc_o0, 0 + bne .LL12 + cmp %loc_o1, %loc_o3 + + !not in table + BAD_TRAP + +.LL1: + jmp %loc_o0 + nop + + + .global trap_table,svt_trap_table_ext,svt_trap_table_ext_end + .section ".rodata" + .align 4 +trap_table: + .long 0,0, _hardreset_svt + .long 1,1, _srmmu_fault_svt ! 01 instruction_access_exception (in mmu_asm.S) + .long 4,4 +#ifndef _SOFT_FLOAT + .long _fpdis_enable_svt ! 04 fp_disabled +#else + .long _fpdis_svt ! 04 fp_disabled +#endif +#ifndef _FLAT + .long 5, 5, _window_overflow_svt ! 05 window_overflow + .long 6, 6, _window_underflow_svt ! 06 window_underflow +#endif + .long 9,9, _srmmu_fault_svt ! 09 data_access_exception (in mmu_asm.S) + .long 0x11,0x1f, _leonbare_irq_entry_svt ! 11-1f interrupt level + .long 0x82,0x82, _irqcall_svt ! 82 +#ifndef _FLAT + .long 0x83,0x83, _flush_windows_svt ! 83 +#endif + .long 0x85,0x85, _irqcall_disableirq_svt ! 85 +svt_trap_table_ext: + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 + .long 0,0,0 +svt_trap_table_ext_end: + .long 0,0,0 + |