/* * %CopyrightBegin% * * Copyright Ericsson AB 2003-2009. All Rights Reserved. * * The contents of this file are subject to the Erlang Public License, * Version 1.1, (the "License"); you may not use this file except in * compliance with the License. You should have received a copy of the * Erlang Public License along with this software. If not, it can be * retrieved online at http://www.erlang.org/. * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See * the License for the specific language governing rights and limitations * under the License. * * %CopyrightEnd% */ /* $Id$ */ #include <stddef.h> /* offsetof() */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "global.h" #include <sys/mman.h> #include "hipe_arch.h" #include "hipe_native_bif.h" /* nbif_callemu() */ #undef F_TIMO #undef THE_NON_VALUE #undef ERL_FUN_SIZE #include "hipe_literals.h" void hipe_patch_load_fe(Uint32 *address, Uint32 value) { /* address points to a disp32 or imm32 operand */ *address = value; } int hipe_patch_insn(void *address, Uint32 value, Eterm type) { switch (type) { case am_closure: case am_constant: case am_atom: case am_c_const: break; case am_x86_abs_pcrel: value += (Uint)address; break; default: return -1; } *(Uint32*)address = value; return 0; } int hipe_patch_call(void *callAddress, void *destAddress, void *trampoline) { Uint rel32; if (trampoline) return -1; rel32 = (Uint)destAddress - (Uint)callAddress - 4; *(Uint32*)callAddress = rel32; hipe_flush_icache_word(callAddress); return 0; } /* * Memory allocator for executable code. * * This is required on x86 because some combinations * of Linux kernels and CPU generations default to * non-executable memory mappings, causing ordinary * malloc() memory to be non-executable. */ static unsigned int code_bytes; static char *code_next; #if 0 /* change to non-zero to get allocation statistics at exit() */ static unsigned int total_mapped, nr_joins, nr_splits, total_alloc, nr_allocs, nr_large, total_lost; static unsigned int atexit_done; static void alloc_code_stats(void) { printf("\r\nalloc_code_stats: %u bytes mapped, %u joins, %u splits, %u bytes allocated, %u average alloc, %u large allocs, %u bytes lost\r\n", total_mapped, nr_joins, nr_splits, total_alloc, nr_allocs ? total_alloc/nr_allocs : 0, nr_large, total_lost); } static void atexit_alloc_code_stats(void) { if (!atexit_done) { atexit_done = 1; (void)atexit(alloc_code_stats); } } #define ALLOC_CODE_STATS(X) do{X;}while(0) #else #define ALLOC_CODE_STATS(X) do{}while(0) #endif /* FreeBSD 6.1 and Darwin breakage */ #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON) #define MAP_ANONYMOUS MAP_ANON #endif static void morecore(unsigned int alloc_bytes) { unsigned int map_bytes; char *map_hint, *map_start; /* Page-align the amount to allocate. */ map_bytes = (alloc_bytes + 4095) & ~4095; /* Round up small allocations. */ if (map_bytes < 1024*1024) map_bytes = 1024*1024; else ALLOC_CODE_STATS(++nr_large); /* Create a new memory mapping, ensuring it is executable and in the low 2GB of the address space. Also attempt to make it adjacent to the previous mapping. */ map_hint = code_next + code_bytes; if ((unsigned long)map_hint & 4095) abort(); map_start = mmap(map_hint, map_bytes, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS #ifdef __x86_64__ |MAP_32BIT #endif , -1, 0); if (map_start == MAP_FAILED) { perror("mmap"); abort(); } ALLOC_CODE_STATS(total_mapped += map_bytes); /* Merge adjacent mappings, so the trailing portion of the previous mapping isn't lost. In practice this is quite successful. */ if (map_start == map_hint) { ALLOC_CODE_STATS(++nr_joins); code_bytes += map_bytes; } else { ALLOC_CODE_STATS(++nr_splits); ALLOC_CODE_STATS(total_lost += code_bytes); code_next = map_start; code_bytes = map_bytes; } ALLOC_CODE_STATS(atexit_alloc_code_stats()); } static void *alloc_code(unsigned int alloc_bytes) { void *res; /* Align function entries. */ alloc_bytes = (alloc_bytes + 3) & ~3; if (code_bytes < alloc_bytes) morecore(alloc_bytes); ALLOC_CODE_STATS(++nr_allocs); ALLOC_CODE_STATS(total_alloc += alloc_bytes); res = code_next; code_next += alloc_bytes; code_bytes -= alloc_bytes; return res; } void *hipe_alloc_code(Uint nrbytes, Eterm callees, Eterm *trampolines, Process *p) { if (is_not_nil(callees)) return NULL; *trampolines = NIL; return alloc_code(nrbytes); } /* called from hipe_bif0.c:hipe_bifs_make_native_stub_2() and hipe_bif0.c:hipe_make_stub() */ void *hipe_make_native_stub(void *beamAddress, unsigned int beamArity) { /* * This creates a native code stub with the following contents: * * movl $Address, P_BEAM_IP(%ebp) * movb $Arity, P_ARITY(%ebp) * jmp callemu * * The stub has variable size, depending on whether the P_BEAM_IP * and P_ARITY offsets fit in 8-bit signed displacements or not. * The rel32 offset in the final jmp depends on its actual location, * which also depends on the size of the previous instructions. * Arity is stored with a movb because (a) Bj�rn tells me arities * are <= 255, and (b) a movb is smaller and faster than a movl. */ unsigned int codeSize; unsigned char *code, *codep; unsigned int callEmuOffset; codeSize = /* 16, 19, or 22 bytes */ 16 + /* 16 when both offsets are 8-bit */ (P_BEAM_IP >= 128 ? 3 : 0) + (P_ARITY >= 128 ? 3 : 0); codep = code = alloc_code(codeSize); /* movl $beamAddress, P_BEAM_IP(%ebp); 3 or 6 bytes, plus 4 */ codep[0] = 0xc7; #if P_BEAM_IP >= 128 codep[1] = 0x85; /* disp32[EBP] */ codep[2] = P_BEAM_IP & 0xFF; codep[3] = (P_BEAM_IP >> 8) & 0xFF; codep[4] = (P_BEAM_IP >> 16) & 0xFF; codep[5] = (P_BEAM_IP >> 24) & 0xFF; codep += 6; #else codep[1] = 0x45; /* disp8[EBP] */ codep[2] = P_BEAM_IP; codep += 3; #endif codep[0] = ((unsigned int)beamAddress) & 0xFF; codep[1] = ((unsigned int)beamAddress >> 8) & 0xFF; codep[2] = ((unsigned int)beamAddress >> 16) & 0xFF; codep[3] = ((unsigned int)beamAddress >> 24) & 0xFF; codep += 4; /* movb $beamArity, P_ARITY(%ebp); 3 or 6 bytes */ codep[0] = 0xc6; #if P_ARITY >= 128 codep[1] = 0x85; /* disp32[EBP] */ codep[2] = P_ARITY & 0xFF; codep[3] = (P_ARITY >> 8) & 0xFF; codep[4] = (P_ARITY >> 16) & 0xFF; codep[5] = (P_ARITY >> 24) & 0xFF; codep += 6; #else codep[1] = 0x45; /* disp8[EBP] */ codep[2] = P_ARITY; codep += 3; #endif codep[0] = beamArity; codep += 1; /* jmp callemu; 5 bytes */ callEmuOffset = (unsigned char*)nbif_callemu - (code + codeSize); codep[0] = 0xe9; codep[1] = callEmuOffset & 0xFF; codep[2] = (callEmuOffset >> 8) & 0xFF; codep[3] = (callEmuOffset >> 16) & 0xFF; codep[4] = (callEmuOffset >> 24) & 0xFF; codep += 5; ASSERT(codep == code + codeSize); /* I-cache flush? */ return code; } void hipe_arch_print_pcb(struct hipe_process_state *p) { #define U(n,x) \ printf(" % 4d | %s | 0x%08x | |\r\n", offsetof(struct hipe_process_state,x), n, (unsigned)p->x) U("ncsp ", ncsp); U("narity ", narity); #undef U }