| /* |
| * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> |
| * Copyright (C) 2009 PetaLogix |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <asm/selfmod.h> |
| |
| #undef DEBUG |
| |
| #if __GNUC__ > 3 |
| #error GCC 4 unsupported SELFMOD. Please disable SELFMOD from menuconfig. |
| #endif |
| |
| #define OPCODE_IMM 0xB0000000 |
| #define OPCODE_LWI 0xE8000000 |
| #define OPCODE_LWI_MASK 0xEC000000 |
| #define OPCODE_RTSD 0xB60F0008 /* return from func: rtsd r15, 8 */ |
| #define OPCODE_ADDIK 0x30000000 |
| #define OPCODE_ADDIK_MASK 0xFC000000 |
| |
| #define IMM_BASE (OPCODE_IMM | (BARRIER_BASE_ADDR >> 16)) |
| #define LWI_BASE (OPCODE_LWI | (BARRIER_BASE_ADDR & 0x0000ff00)) |
| #define LWI_BASE_MASK (OPCODE_LWI_MASK | (BARRIER_BASE_ADDR & 0x0000ff00)) |
| #define ADDIK_BASE (OPCODE_ADDIK | (BARRIER_BASE_ADDR & 0x0000ff00)) |
| #define ADDIK_BASE_MASK (OPCODE_ADDIK_MASK | (BARRIER_BASE_ADDR & 0x0000ff00)) |
| |
| #define MODIFY_INSTR { \ |
| pr_debug("%s: curr instr, (%d):0x%x, next(%d):0x%x\n", \ |
| __func__, i, addr[i], i + 1, addr[i + 1]); \ |
| addr[i] = OPCODE_IMM + (base >> 16); \ |
| /* keep instruction opcode and add only last 16bits */ \ |
| addr[i + 1] = (addr[i + 1] & 0xffff00ff) + (base & 0xffff); \ |
| __invalidate_icache(addr[i]); \ |
| __invalidate_icache(addr[i + 1]); \ |
| pr_debug("%s: hack instr, (%d):0x%x, next(%d):0x%x\n", \ |
| __func__, i, addr[i], i + 1, addr[i + 1]); } |
| |
| /* NOTE |
| * self-modified part of code for improvement of interrupt controller |
| * save instruction in interrupt rutine |
| */ |
| void selfmod_function(const int *arr_fce, const unsigned int base) |
| { |
| unsigned int flags, i, j, *addr = NULL; |
| |
| local_irq_save(flags); |
| __disable_icache(); |
| |
| /* zero terminated array */ |
| for (j = 0; arr_fce[j] != 0; j++) { |
| /* get start address of function */ |
| addr = (unsigned int *) arr_fce[j]; |
| pr_debug("%s: func(%d) at 0x%x\n", |
| __func__, j, (unsigned int) addr); |
| for (i = 0; ; i++) { |
| pr_debug("%s: instruction code at %d: 0x%x\n", |
| __func__, i, addr[i]); |
| if (addr[i] == IMM_BASE) { |
| /* detecting of lwi (0xE8) or swi (0xF8) instr |
| * I can detect both opcode with one mask */ |
| if ((addr[i + 1] & LWI_BASE_MASK) == LWI_BASE) { |
| MODIFY_INSTR; |
| } else /* detection addik for ack */ |
| if ((addr[i + 1] & ADDIK_BASE_MASK) == |
| ADDIK_BASE) { |
| MODIFY_INSTR; |
| } |
| } else if (addr[i] == OPCODE_RTSD) { |
| /* return from function means end of function */ |
| pr_debug("%s: end of array %d\n", __func__, i); |
| break; |
| } |
| } |
| } |
| local_irq_restore(flags); |
| } /* end of self-modified code */ |
