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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 | /* $Id: btfixup.c,v 1.7 1998/03/09 14:03:56 jj Exp $ * btfixup.c: Boot time code fixup and relocator, so that * we can get rid of most indirect calls to achieve single * image sun4c and srmmu kernel. * * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/init.h> #include <asm/btfixup.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/oplib.h> #include <asm/system.h> #define BTFIXUP_OPTIMIZE_NOP #define BTFIXUP_OPTIMIZE_OTHER extern char *srmmu_name; static char version[] __initdata = "Boot time fixup v1.6. 4/Mar/98 Jakub Jelinek (jj@ultra.linux.cz). Patching kernel for "; #ifdef CONFIG_SUN4 static char str_sun4c[] __initdata = "sun4\n"; #else static char str_sun4c[] __initdata = "sun4c\n"; #endif static char str_srmmu[] __initdata = "srmmu[%s]/"; static char str_iommu[] __initdata = "iommu\n"; static char str_iounit[] __initdata = "io-unit\n"; static int visited __initdata = 0; extern unsigned int ___btfixup_start[], ___btfixup_end[], __init_begin[], __init_end[], __init_text_end[]; extern unsigned int _stext[], _end[], __start___ksymtab[], __stop___ksymtab[]; static char wrong_f[] __initdata = "Trying to set f fixup %p to invalid function %08x\n"; static char wrong_b[] __initdata = "Trying to set b fixup %p to invalid function %08x\n"; static char wrong_s[] __initdata = "Trying to set s fixup %p to invalid value %08x\n"; static char wrong_h[] __initdata = "Trying to set h fixup %p to invalid value %08x\n"; static char wrong_a[] __initdata = "Trying to set a fixup %p to invalid value %08x\n"; static char wrong[] __initdata = "Wrong address for %c fixup %p\n"; static char insn_f[] __initdata = "Fixup f %p refers to weird instructions at %p[%08x,%08x]\n"; static char insn_b[] __initdata = "Fixup b %p doesn't refer to a SETHI at %p[%08x]\n"; static char insn_s[] __initdata = "Fixup s %p doesn't refer to an OR at %p[%08x]\n"; static char insn_h[] __initdata = "Fixup h %p doesn't refer to a SETHI at %p[%08x]\n"; static char insn_a[] __initdata = "Fixup a %p doesn't refer to a SETHI nor OR at %p[%08x]\n"; static char insn_i[] __initdata = "Fixup i %p doesn't refer to a valid instruction at %p[%08x]\n"; static char fca_und[] __initdata = "flush_cache_all undefined in btfixup()\n"; static char wrong_setaddr[] __initdata = "Garbled CALL/INT patch at %p[%08x,%08x,%08x]=%08x\n"; #ifdef BTFIXUP_OPTIMIZE_OTHER __initfunc(static void set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)) { if (!fmangled) *addr = value; else { unsigned int *q = (unsigned int *)q1; if (*addr == 0x01000000) { /* Noped */ *q = value; } else if (addr[-1] == *q) { /* Moved */ addr[-1] = value; *q = value; } else { prom_printf(wrong_setaddr, addr-1, addr[-1], *addr, *q, value); prom_halt(); } } } #else static __inline__ void set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value) { *addr = value; } #endif __initfunc(void btfixup(void)) { unsigned int *p, *q; int type, count; unsigned insn; unsigned *addr; int fmangled = 0; void (*flush_cacheall)(void); if (!visited) { visited++; printk(version); if (ARCH_SUN4C_SUN4) printk(str_sun4c); else { printk(str_srmmu, srmmu_name); if (sparc_cpu_model == sun4d) printk(str_iounit); else printk(str_iommu); } } for (p = ___btfixup_start; p < ___btfixup_end; ) { count = p[2]; q = p + 3; switch (type = *(unsigned char *)p) { case 'f': count = p[3]; q = p + 4; if (((p[0] & 1) || p[1]) && ((p[1] & 3) || (unsigned *)(p[1]) < _stext || (unsigned *)(p[1]) >= _end)) { prom_printf(wrong_f, p, p[1]); prom_halt(); } break; case 'b': if (p[1] < (unsigned long)__init_begin || p[1] >= (unsigned long)__init_text_end || (p[1] & 3)) { prom_printf(wrong_b, p, p[1]); prom_halt(); } break; case 's': if (p[1] + 0x1000 >= 0x2000) { prom_printf(wrong_s, p, p[1]); prom_halt(); } break; case 'h': if (p[1] & 0x3ff) { prom_printf(wrong_h, p, p[1]); prom_halt(); } break; case 'a': if (p[1] + 0x1000 >= 0x2000 && (p[1] & 0x3ff)) { prom_printf(wrong_a, p, p[1]); prom_halt(); } break; } if (p[0] & 1) { p[0] &= ~1; while (count) { fmangled = 0; addr = (unsigned *)*q; if (addr < _stext || addr >= _end) { prom_printf(wrong, type, p); prom_halt(); } insn = *addr; #ifdef BTFIXUP_OPTIMIZE_OTHER if (type != 'f' && q[1]) { insn = *(unsigned int *)q[1]; if (!insn || insn == 1) insn = *addr; else fmangled = 1; } #endif switch (type) { case 'f': /* CALL */ if (addr >= __start___ksymtab && addr < __stop___ksymtab) { *addr = p[1]; break; } else if (!q[1]) { if ((insn & 0xc1c00000) == 0x01000000) { /* SETHI */ *addr = (insn & 0xffc00000) | (p[1] >> 10); break; } else if ((insn & 0xc1f82000) == 0x80102000) { /* OR X, %LO(i), Y */ *addr = (insn & 0xffffe000) | (p[1] & 0x3ff); break; } else if ((insn & 0xc0000000) != 0x40000000) { /* !CALL */ bad_f: prom_printf(insn_f, p, addr, insn, addr[1]); prom_halt(); } } else if (q[1] != 1) addr[1] = q[1]; if (p[2] == BTFIXUPCALL_NORM) { norm_f: *addr = 0x40000000 | ((p[1] - (unsigned)addr) >> 2); q[1] = 0; break; } #ifndef BTFIXUP_OPTIMIZE_NOP goto norm_f; #else if (!(addr[1] & 0x80000000)) { if ((addr[1] & 0xc1c00000) != 0x01000000) /* !SETHI */ goto bad_f; /* CALL, Bicc, FBfcc, CBccc are weird in delay slot, aren't they? */ } else { if ((addr[1] & 0x01800000) == 0x01800000) { if ((addr[1] & 0x01f80000) == 0x01e80000) { /* RESTORE */ goto norm_f; /* It is dangerous to patch that */ } goto bad_f; } if ((addr[1] & 0xffffe003) == 0x9e03e000) { /* ADD %O7, XX, %o7 */ int displac = (addr[1] << 19); displac = (displac >> 21) + 2; *addr = (0x10800000) + (displac & 0x3fffff); q[1] = addr[1]; addr[1] = p[2]; break; } if ((addr[1] & 0x201f) == 0x200f || (addr[1] & 0x7c000) == 0x3c000) goto norm_f; /* Someone is playing bad tricks with us: rs1 or rs2 is o7 */ if ((addr[1] & 0x3e000000) == 0x1e000000) goto norm_f; /* rd is %o7. We'd better take care. */ } if (p[2] == BTFIXUPCALL_NOP) { *addr = 0x01000000; q[1] = 1; break; } #ifndef BTFIXUP_OPTIMIZE_OTHER goto norm_f; #else if (addr[1] == 0x01000000) { /* NOP in the delay slot */ q[1] = addr[1]; *addr = p[2]; break; } if ((addr[1] & 0xc0000000) != 0xc0000000) { /* Not a memory operation */ if ((addr[1] & 0x30000000) == 0x10000000) { /* Ok, non-memory op with rd %oX */ if ((addr[1] & 0x3e000000) == 0x1c000000) goto bad_f; /* Aiee. Someone is playing strange %sp tricks */ if ((addr[1] & 0x3e000000) > 0x12000000 || ((addr[1] & 0x3e000000) == 0x12000000 && p[2] != BTFIXUPCALL_STO1O0 && p[2] != BTFIXUPCALL_SWAPO0O1) || ((p[2] & 0xffffe000) == BTFIXUPCALL_RETINT(0))) { /* Nobody uses the result. We can nop it out. */ *addr = p[2]; q[1] = addr[1]; addr[1] = 0x01000000; break; } if ((addr[1] & 0xf1ffffe0) == 0x90100000) { /* MOV %reg, %Ox */ if ((addr[1] & 0x3e000000) == 0x10000000 && (p[2] & 0x7c000) == 0x20000) { /* Ok, it is call xx; mov reg, %o0 and call optimizes to doing something on %o0. Patch the patch. */ *addr = (p[2] & ~0x7c000) | ((addr[1] & 0x1f) << 14); q[1] = addr[1]; addr[1] = 0x01000000; break; } if ((addr[1] & 0x3e000000) == 0x12000000 && p[2] == BTFIXUPCALL_STO1O0) { *addr = (p[2] & ~0x3e000000) | ((addr[1] & 0x1f) << 25); q[1] = addr[1]; addr[1] = 0x01000000; break; } } } } *addr = addr[1]; q[1] = addr[1]; addr[1] = p[2]; break; #endif /* BTFIXUP_OPTIMIZE_OTHER */ #endif /* BTFIXUP_OPTIMIZE_NOP */ case 'b': /* BLACKBOX */ /* Has to be sethi i, xx */ if ((insn & 0xc1c00000) != 0x01000000) { prom_printf(insn_b, p, addr, insn); prom_halt(); } else { void (*do_fixup)(unsigned *); do_fixup = (void (*)(unsigned *))p[1]; do_fixup(addr); } break; case 's': /* SIMM13 */ /* Has to be or %g0, i, xx */ if ((insn & 0xc1ffe000) != 0x80102000) { prom_printf(insn_s, p, addr, insn); prom_halt(); } set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x1fff)); break; case 'h': /* SETHI */ /* Has to be sethi i, xx */ if ((insn & 0xc1c00000) != 0x01000000) { prom_printf(insn_h, p, addr, insn); prom_halt(); } set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10)); break; case 'a': /* HALF */ /* Has to be sethi i, xx or or %g0, i, xx */ if ((insn & 0xc1c00000) != 0x01000000 && (insn & 0xc1ffe000) != 0x80102000) { prom_printf(insn_a, p, addr, insn); prom_halt(); } if (p[1] & 0x3ff) set_addr(addr, q[1], fmangled, (insn & 0x3e000000) | 0x80102000 | (p[1] & 0x1fff)); else set_addr(addr, q[1], fmangled, (insn & 0x3e000000) | 0x01000000 | (p[1] >> 10)); break; case 'i': /* INT */ if ((insn & 0xc1c00000) == 0x01000000) /* %HI */ set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10)); else if ((insn & 0x80002000) == 0x80002000 && (insn & 0x01800000) != 0x01800000) /* %LO */ set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x3ff)); else { prom_printf(insn_i, p, addr, insn); prom_halt(); } break; } count -= 2; q += 2; } } else p = q + count; } #ifdef __SMP__ flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(local_flush_cache_all); #else flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(flush_cache_all); #endif if (!flush_cacheall) { prom_printf(fca_und); prom_halt(); } (*flush_cacheall)(); } |