901 lines
20 KiB
C++
901 lines
20 KiB
C++
// vim: set ts=8 sts=2 sw=2 tw=99 et:
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//
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// This file is part of SourcePawn.
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//
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// SourcePawn is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// SourcePawn is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with SourcePawn. If not, see <http://www.gnu.org/licenses/>.
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#include <limits.h>
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#include <string.h>
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#include "interpreter.h"
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#include "opcodes.h"
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#include "watchdog_timer.h"
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#include "environment.h"
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#define STACK_MARGIN 64
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using namespace sp;
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using namespace SourcePawn;
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static inline bool
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IsValidOffset(uint32_t cip)
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{
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return cip % 4 == 0;
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}
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static inline cell_t
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Read(const sp_plugin_t *plugin, cell_t offset)
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{
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return *reinterpret_cast<cell_t *>(plugin->memory + offset);
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}
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static inline void
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Write(const sp_plugin_t *plugin, cell_t offset, cell_t value)
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{
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*reinterpret_cast<cell_t *>(plugin->memory + offset) = value;
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}
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static inline cell_t *
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Jump(const sp_plugin_t *plugin, sp_context_t *ctx, cell_t target)
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{
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if (!IsValidOffset(target) || uint32_t(target) >= plugin->pcode_size)
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return NULL;
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return reinterpret_cast<cell_t *>(plugin->pcode + target);
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}
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static inline cell_t *
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JumpTarget(const sp_plugin_t *plugin, sp_context_t *ctx, cell_t *cip, bool cond, int *errp)
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{
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if (!cond)
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return cip + 1;
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cell_t target = *cip;
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if (!IsValidOffset(target) || uint32_t(target) >= plugin->pcode_size) {
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*errp = SP_ERROR_INVALID_INSTRUCTION;
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return NULL;
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}
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cell_t *next = reinterpret_cast<cell_t *>(plugin->pcode + target);
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if (next < cip && !Environment::get()->watchdog()->HandleInterrupt()) {
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*errp = SP_ERROR_TIMEOUT;
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return NULL;
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}
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return next;
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}
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static inline bool
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CheckAddress(const sp_plugin_t *plugin, sp_context_t *ctx, cell_t *stk, cell_t addr)
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{
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if (uint32_t(addr) >= plugin->mem_size)
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return false;
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if (addr < ctx->hp)
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return true;
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if (reinterpret_cast<cell_t *>(plugin->memory + addr) < stk)
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return false;
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return true;
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}
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static inline int
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GenerateArray(PluginRuntime *rt, sp_context_t *ctx, cell_t dims, cell_t *stk, bool autozero)
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{
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if (dims == 1) {
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uint32_t size = *stk;
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if (size == 0 || !ke::IsUint32MultiplySafe(size, 4))
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return SP_ERROR_ARRAY_TOO_BIG;
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*stk = ctx->hp;
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uint32_t bytes = size * 4;
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ctx->hp += bytes;
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if (uintptr_t(ctx->plugin->memory + ctx->hp) >= uintptr_t(stk))
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return SP_ERROR_HEAPLOW;
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if (int err = rt->GetBaseContext()->pushTracker(bytes))
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return err;
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if (autozero)
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memset(ctx->plugin->memory + ctx->hp, 0, bytes);
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return SP_ERROR_NONE;
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}
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if (int err = GenerateFullArray(rt, dims, stk, autozero))
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return err;
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return SP_ERROR_NONE;
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}
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int
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Interpret(PluginRuntime *rt, uint32_t aCodeStart, cell_t *rval)
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{
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const sp_plugin_t *plugin = rt->plugin();
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cell_t *code = reinterpret_cast<cell_t *>(plugin->pcode);
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cell_t *codeend = reinterpret_cast<cell_t *>(plugin->pcode + plugin->pcode_size);
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if (!IsValidOffset(aCodeStart) || aCodeStart > plugin->pcode_size)
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return SP_ERROR_INVALID_INSTRUCTION;
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PluginContext *cx = rt->GetBaseContext();
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sp_context_t *ctx = cx->GetCtx();
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int err = SP_ERROR_NONE;
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// Save the original frm. BaseContext won't, and if we error, we won't hit
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// the stack unwinding code.
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cell_t orig_frm = ctx->frm;
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cell_t pri = 0;
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cell_t alt = 0;
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cell_t *cip = code + (aCodeStart / 4);
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cell_t *stk = reinterpret_cast<cell_t *>(plugin->memory + ctx->sp);
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for (;;) {
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if (cip >= codeend) {
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err = SP_ERROR_INVALID_INSTRUCTION;
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goto error;
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}
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#if 0
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SpewOpcode(plugin, reinterpret_cast<cell_t *>(plugin->pcode + aCodeStart), cip);
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#endif
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OPCODE op = (OPCODE)*cip++;
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switch (op) {
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case OP_MOVE_PRI:
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pri = alt;
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break;
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case OP_MOVE_ALT:
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alt = pri;
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break;
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case OP_XCHG:
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{
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cell_t tmp = pri;
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pri = alt;
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alt = tmp;
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break;
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}
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case OP_ZERO:
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Write(plugin, *cip++, 0);
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break;
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case OP_ZERO_S:
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Write(plugin, ctx->frm + *cip++, 0);
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break;
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case OP_PUSH_PRI:
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*--stk = pri;
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break;
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case OP_PUSH_ALT:
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*--stk = alt;
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break;
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case OP_PUSH_C:
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case OP_PUSH2_C:
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case OP_PUSH3_C:
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case OP_PUSH4_C:
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case OP_PUSH5_C:
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{
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int n = 1;
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if (op >= OP_PUSH2_C)
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n = ((op - OP_PUSH2_C) / 4) + 2;
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int i = 1;
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do {
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*--stk = *cip++;
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} while (i++ < n);
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break;
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}
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case OP_PUSH_ADR:
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case OP_PUSH2_ADR:
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case OP_PUSH3_ADR:
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case OP_PUSH4_ADR:
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case OP_PUSH5_ADR:
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{
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int n = 1;
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if (op >= OP_PUSH2_ADR)
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n = ((op - OP_PUSH2_ADR) / 4) + 2;
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int i = 1;
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do {
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cell_t addr = ctx->frm + *cip++;
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*--stk = addr;
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} while (i++ < n);
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break;
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}
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case OP_PUSH_S:
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case OP_PUSH2_S:
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case OP_PUSH3_S:
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case OP_PUSH4_S:
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case OP_PUSH5_S:
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{
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int n = 1;
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if (op >= OP_PUSH2_S)
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n = ((op - OP_PUSH2_S) / 4) + 2;
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int i = 1;
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do {
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cell_t value = Read(plugin, ctx->frm + *cip++);
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*--stk = value;
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} while (i++ < n);
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break;
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}
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case OP_PUSH:
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case OP_PUSH2:
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case OP_PUSH3:
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case OP_PUSH4:
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case OP_PUSH5:
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{
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int n = 1;
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if (op >= OP_PUSH2)
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n = ((op - OP_PUSH2) / 4) + 2;
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int i = 1;
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do {
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cell_t value = Read(plugin, *cip++);
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*--stk = value;
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} while (i++ < n);
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break;
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}
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case OP_ZERO_PRI:
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pri = 0;
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break;
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case OP_ZERO_ALT:
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alt = 0;
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break;
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case OP_ADD:
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pri += alt;
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break;
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case OP_SUB:
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pri -= alt;
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break;
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case OP_SUB_ALT:
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pri = alt - pri;
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break;
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case OP_PROC:
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{
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*--stk = ctx->frm;
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*--stk = 0;
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ctx->frm = uintptr_t(stk) - uintptr_t(plugin->memory);
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break;
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}
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case OP_IDXADDR_B:
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pri <<= *cip++;
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pri += alt;
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break;
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case OP_SHL:
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pri <<= alt;
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break;
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case OP_SHR:
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pri = unsigned(pri) >> unsigned(alt);
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break;
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case OP_SSHR:
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pri >>= alt;
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break;
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case OP_SHL_C_PRI:
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pri <<= *cip++;
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break;
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case OP_SHL_C_ALT:
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alt <<= *cip++;
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break;
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case OP_SHR_C_PRI:
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pri >>= *cip++;
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break;
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case OP_SHR_C_ALT:
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alt >>= *cip++;
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break;
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case OP_SMUL:
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pri *= alt;
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break;
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case OP_NOT:
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pri = pri ? 0 : 1;
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break;
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case OP_NEG:
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pri = -pri;
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break;
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case OP_XOR:
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pri ^= alt;
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break;
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case OP_OR:
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pri |= alt;
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break;
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case OP_AND:
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pri &= alt;
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break;
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case OP_INVERT:
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pri = ~pri;
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break;
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case OP_ADD_C:
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pri += *cip++;
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break;
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case OP_SMUL_C:
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pri *= *cip++;
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break;
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case OP_EQ:
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pri = pri == alt;
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break;
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case OP_NEQ:
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pri = pri != alt;
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break;
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case OP_SLESS:
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pri = pri < alt;
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break;
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case OP_SLEQ:
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pri = pri <= alt;
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break;
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case OP_SGRTR:
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pri = pri > alt;
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break;
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case OP_SGEQ:
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pri = pri >= alt;
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break;
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case OP_EQ_C_PRI:
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pri = pri == *cip++;
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break;
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case OP_EQ_C_ALT:
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pri = alt == *cip++;
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break;
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case OP_INC_PRI:
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pri++;
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break;
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case OP_INC_ALT:
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alt++;
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break;
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case OP_INC:
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{
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cell_t offset = *cip++;
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Write(plugin, offset, Read(plugin, offset) + 1);
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break;
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}
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case OP_INC_S:
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{
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cell_t offset = *cip++;
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cell_t value = Read(plugin, ctx->frm + offset);
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Write(plugin, ctx->frm + offset, value + 1);
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break;
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}
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case OP_INC_I:
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if (!CheckAddress(plugin, ctx, stk, pri)) {
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err = SP_ERROR_MEMACCESS;
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goto error;
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}
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Write(plugin, pri, Read(plugin, pri) + 1);
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break;
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case OP_DEC_PRI:
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pri--;
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break;
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case OP_DEC_ALT:
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alt--;
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break;
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case OP_DEC:
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{
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cell_t offset = *cip++;
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Write(plugin, offset, Read(plugin, offset) - 1);
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break;
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}
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case OP_DEC_S:
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{
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cell_t offset = *cip++;
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cell_t value = Read(plugin, ctx->frm + offset);
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Write(plugin, ctx->frm + offset, value - 1);
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break;
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}
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case OP_DEC_I:
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if (!CheckAddress(plugin, ctx, stk, pri)) {
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err = SP_ERROR_MEMACCESS;
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goto error;
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}
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Write(plugin, pri, Read(plugin, pri) - 1);
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break;
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case OP_LOAD_PRI:
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pri = Read(plugin, *cip++);
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break;
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case OP_LOAD_ALT:
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alt = Read(plugin, *cip++);
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break;
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case OP_LOAD_S_PRI:
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pri = Read(plugin, ctx->frm + *cip++);
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break;
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case OP_LOAD_S_ALT:
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alt = Read(plugin, ctx->frm + *cip++);
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break;
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case OP_LOAD_S_BOTH:
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pri = Read(plugin, ctx->frm + *cip++);
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alt = Read(plugin, ctx->frm + *cip++);
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break;
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case OP_LREF_S_PRI:
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{
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pri = Read(plugin, ctx->frm + *cip++);
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pri = Read(plugin, pri);
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break;
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}
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case OP_LREF_S_ALT:
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{
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alt = Read(plugin, ctx->frm + *cip++);
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alt = Read(plugin, alt);
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break;
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}
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case OP_CONST_PRI:
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pri = *cip++;
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break;
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case OP_CONST_ALT:
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alt = *cip++;
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break;
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case OP_ADDR_PRI:
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pri = ctx->frm + *cip++;
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break;
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case OP_ADDR_ALT:
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alt = ctx->frm + *cip++;
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break;
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case OP_STOR_PRI:
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Write(plugin, *cip++, pri);
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break;
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case OP_STOR_ALT:
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Write(plugin, *cip++, alt);
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break;
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case OP_STOR_S_PRI:
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Write(plugin, ctx->frm + *cip++, pri);
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break;
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case OP_STOR_S_ALT:
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Write(plugin, ctx->frm +*cip++, alt);
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break;
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case OP_IDXADDR:
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pri = alt + pri * 4;
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break;
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case OP_SREF_S_PRI:
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{
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cell_t offset = *cip++;
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cell_t addr = Read(plugin, ctx->frm + offset);
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Write(plugin, addr, pri);
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break;
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}
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case OP_SREF_S_ALT:
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{
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cell_t offset = *cip++;
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cell_t addr = Read(plugin, ctx->frm + offset);
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Write(plugin, addr, alt);
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break;
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}
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case OP_POP_PRI:
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pri = *stk++;
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break;
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case OP_POP_ALT:
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alt = *stk++;
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break;
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case OP_SWAP_PRI:
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case OP_SWAP_ALT:
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{
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cell_t reg = (op == OP_SREF_S_PRI) ? pri : alt;
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cell_t temp = *stk;
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*stk = reg;
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reg = temp;
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break;
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}
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case OP_LIDX:
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pri = alt + pri * 4;
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if (!CheckAddress(plugin, ctx, stk, pri)) {
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err = SP_ERROR_MEMACCESS;
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goto error;
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}
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pri = Read(plugin, pri);
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break;
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case OP_LIDX_B:
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{
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cell_t val = *cip++;
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pri = alt + (pri << val);
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if (!CheckAddress(plugin, ctx, stk, pri)) {
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err = SP_ERROR_MEMACCESS;
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goto error;
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}
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pri = Read(plugin, pri);
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break;
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}
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case OP_CONST:
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{
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cell_t offset = *cip++;
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cell_t value = *cip++;
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Write(plugin, offset, value);
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break;
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}
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case OP_CONST_S:
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{
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cell_t offset = *cip++;
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cell_t value = *cip++;
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Write(plugin, ctx->frm + offset, value);
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break;
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}
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case OP_LOAD_I:
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if (!CheckAddress(plugin, ctx, stk, pri)) {
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err = SP_ERROR_MEMACCESS;
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goto error;
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}
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pri = Read(plugin, pri);
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break;
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case OP_STOR_I:
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if (!CheckAddress(plugin, ctx, stk, alt)) {
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err = SP_ERROR_MEMACCESS;
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goto error;
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}
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Write(plugin, alt, pri);
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break;
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case OP_SDIV:
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case OP_SDIV_ALT:
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{
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cell_t dividend = (op == OP_SDIV) ? pri : alt;
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cell_t divisor = (op == OP_SDIV) ? alt : pri;
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if (divisor == 0) {
|
|
err = SP_ERROR_DIVIDE_BY_ZERO;
|
|
goto error;
|
|
}
|
|
if (dividend == INT_MIN && divisor == -1) {
|
|
err = SP_ERROR_INTEGER_OVERFLOW;
|
|
goto error;
|
|
}
|
|
pri = dividend / divisor;
|
|
alt = dividend % divisor;
|
|
break;
|
|
}
|
|
|
|
case OP_LODB_I:
|
|
{
|
|
cell_t val = *cip++;
|
|
if (!CheckAddress(plugin, ctx, stk, pri)) {
|
|
err = SP_ERROR_MEMACCESS;
|
|
goto error;
|
|
}
|
|
pri = Read(plugin, pri);
|
|
if (val == 1)
|
|
pri &= 0xff;
|
|
else if (val == 2)
|
|
pri &= 0xffff;
|
|
break;
|
|
}
|
|
|
|
case OP_STRB_I:
|
|
{
|
|
cell_t val = *cip++;
|
|
if (!CheckAddress(plugin, ctx, stk, alt)) {
|
|
err = SP_ERROR_MEMACCESS;
|
|
goto error;
|
|
}
|
|
if (val == 1)
|
|
*reinterpret_cast<int8_t *>(plugin->memory + alt) = pri;
|
|
else if (val == 2)
|
|
*reinterpret_cast<int16_t *>(plugin->memory + alt) = pri;
|
|
else if (val == 4)
|
|
*reinterpret_cast<int32_t *>(plugin->memory + alt) = pri;
|
|
break;
|
|
}
|
|
|
|
case OP_RETN:
|
|
{
|
|
stk++;
|
|
ctx->frm = *stk++;
|
|
stk += *stk + 1;
|
|
*rval = pri;
|
|
err = SP_ERROR_NONE;
|
|
goto done;
|
|
}
|
|
|
|
case OP_MOVS:
|
|
{
|
|
uint8_t *src = plugin->memory + pri;
|
|
uint8_t *dest = plugin->memory + alt;
|
|
memcpy(dest, src, *cip++);
|
|
break;
|
|
}
|
|
|
|
case OP_FILL:
|
|
{
|
|
uint8_t *dest = plugin->memory + alt;
|
|
memset(dest, pri, *cip++);
|
|
break;
|
|
}
|
|
|
|
case OP_STRADJUST_PRI:
|
|
pri += 4;
|
|
pri >>= 2;
|
|
break;
|
|
|
|
case OP_STACK:
|
|
{
|
|
cell_t amount = *cip++;
|
|
if (!IsValidOffset(amount)) {
|
|
err = SP_ERROR_INVALID_INSTRUCTION;
|
|
goto error;
|
|
}
|
|
|
|
stk += amount / 4;
|
|
if (amount > 0) {
|
|
if (uintptr_t(stk) >= uintptr_t(plugin->memory + plugin->mem_size)) {
|
|
err = SP_ERROR_STACKMIN;
|
|
goto error;
|
|
}
|
|
} else {
|
|
if (uintptr_t(stk) < uintptr_t(plugin->memory + ctx->hp + STACK_MARGIN)) {
|
|
err = SP_ERROR_STACKLOW;
|
|
goto error;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OP_HEAP:
|
|
{
|
|
cell_t amount = *cip++;
|
|
|
|
alt = ctx->hp;
|
|
ctx->hp += amount;
|
|
|
|
if (amount > 0) {
|
|
if (uintptr_t(plugin->memory + ctx->hp) > uintptr_t(stk)) {
|
|
err = SP_ERROR_HEAPLOW;
|
|
goto error;
|
|
}
|
|
} else {
|
|
if (uint32_t(ctx->hp) < plugin->data_size) {
|
|
err = SP_ERROR_HEAPMIN;
|
|
goto error;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OP_JUMP:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, true, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
|
|
case OP_JZER:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri == 0, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
case OP_JNZ:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri != 0, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
|
|
case OP_JEQ:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri == alt, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
case OP_JNEQ:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri != alt, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
case OP_JSLESS:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri < alt, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
case OP_JSLEQ:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri <= alt, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
case OP_JSGRTR:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri > alt, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
case OP_JSGEQ:
|
|
if ((cip = JumpTarget(plugin, ctx, cip, pri >= alt, &err)) == NULL)
|
|
goto error;
|
|
break;
|
|
|
|
case OP_TRACKER_PUSH_C:
|
|
{
|
|
cell_t amount = *cip++;
|
|
int error = cx->pushTracker(amount * 4);
|
|
if (error != SP_ERROR_NONE) {
|
|
err = error;
|
|
goto error;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OP_TRACKER_POP_SETHEAP:
|
|
{
|
|
int error = cx->popTrackerAndSetHeap();
|
|
if (error != SP_ERROR_NONE) {
|
|
err = error;
|
|
goto error;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OP_BREAK:
|
|
ctx->cip = uintptr_t(cip - 1) - uintptr_t(plugin->pcode);
|
|
break;
|
|
|
|
case OP_BOUNDS:
|
|
{
|
|
cell_t value = *cip++;
|
|
if (uint32_t(pri) > uint32_t(value)) {
|
|
err = SP_ERROR_ARRAY_BOUNDS;
|
|
goto error;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OP_CALL:
|
|
{
|
|
cell_t offset = *cip++;
|
|
|
|
if (!IsValidOffset(offset) || uint32_t(offset) >= plugin->pcode_size) {
|
|
err = SP_ERROR_INSTRUCTION_PARAM;
|
|
goto error;
|
|
}
|
|
|
|
// For debugging.
|
|
uintptr_t rcip = uintptr_t(cip - 2) - uintptr_t(plugin->pcode);
|
|
if (!cx->pushReturnCip(rcip)) {
|
|
err = SP_ERROR_STACKLOW;
|
|
goto error;
|
|
}
|
|
ctx->cip = offset;
|
|
ctx->sp = uintptr_t(stk) - uintptr_t(plugin->memory);
|
|
|
|
int err = Interpret(rt, offset, &pri);
|
|
|
|
stk = reinterpret_cast<cell_t *>(plugin->memory + ctx->sp);
|
|
ctx->cip = rcip;
|
|
cx->popReturnCip();
|
|
|
|
if (err != SP_ERROR_NONE)
|
|
goto error;
|
|
break;
|
|
}
|
|
|
|
case OP_GENARRAY:
|
|
case OP_GENARRAY_Z:
|
|
{
|
|
cell_t val = *cip++;
|
|
if ((err = GenerateArray(rt, ctx, val, stk, op == OP_GENARRAY_Z)) != SP_ERROR_NONE)
|
|
goto error;
|
|
|
|
stk += (val - 1) * 4;
|
|
break;
|
|
}
|
|
|
|
case OP_SYSREQ_C:
|
|
case OP_SYSREQ_N:
|
|
{
|
|
uint32_t native_index = *cip++;
|
|
|
|
if (native_index >= plugin->num_natives) {
|
|
err = SP_ERROR_INSTRUCTION_PARAM;
|
|
goto error;
|
|
}
|
|
|
|
uint32_t num_params;
|
|
if (op == OP_SYSREQ_N) {
|
|
num_params = *cip++;
|
|
*--stk = num_params;
|
|
}
|
|
|
|
ctx->sp = uintptr_t(stk) - uintptr_t(plugin->memory);
|
|
pri = cx->invokeNative(native_index, stk);
|
|
if (cx->GetLastNativeError() != SP_ERROR_NONE) {
|
|
err = cx->GetLastNativeError();
|
|
goto error;
|
|
}
|
|
|
|
if (op == OP_SYSREQ_N)
|
|
stk += num_params + 1;
|
|
break;
|
|
}
|
|
|
|
case OP_SWITCH:
|
|
{
|
|
cell_t offset = *cip++;
|
|
cell_t *table = reinterpret_cast<cell_t *>(plugin->pcode + offset + sizeof(cell_t));
|
|
|
|
size_t ncases = *table++;
|
|
cell_t target = *table++; // default case
|
|
|
|
for (size_t i = 0; i < ncases; i++) {
|
|
if (table[i * 2] == pri) {
|
|
target = table[i * 2 + 1];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((cip = Jump(plugin, ctx, target)) == NULL) {
|
|
err = SP_ERROR_INVALID_INSTRUCTION;
|
|
goto error;
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
{
|
|
err = SP_ERROR_INVALID_INSTRUCTION;
|
|
goto error;
|
|
}
|
|
} // switch
|
|
}
|
|
|
|
done:
|
|
assert(orig_frm == ctx->frm);
|
|
ctx->sp = uintptr_t(stk) - uintptr_t(plugin->memory);
|
|
return err;
|
|
|
|
error:
|
|
ctx->frm = orig_frm;
|
|
goto done;
|
|
}
|
|
|