Support demand paging via closures and seh
Reverts 12a79192ee
which exploits normal tcg mechanism
This uses a trampoline to pass extra data to seh handlers
This commit is contained in:
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7b4dc569cc
commit
3d5b2643f0
@ -399,6 +399,11 @@ struct uc_struct {
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struct TranslationBlock *last_tb; // The real last tb we executed.
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FlatView *empty_view; // Static function variable moved from flatviews_init
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#ifdef WIN32
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PVOID seh_handle;
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void* seh_closure;
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#endif
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};
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// Metadata stub for the variable-size cpu context used with uc_context_*()
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@ -6,11 +6,4 @@
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// #define CONFIG_INT128 1
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#define CONFIG_CMPXCHG128 1
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// #define CONFIG_ATOMIC64 1
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#define CONFIG_PLUGIN 1
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// QEMU by default allocates (and commits) 1GB memory on Windows, and multiple Unicorn instances will result in OOM error easily.
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// Unfortunately, Windows doesn't have a similar demand paging feature like mmap(), therefore a workaround is to use tcg regions mechanism.
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// Note most Unicorn hacks (and even QEMU!) relies on the assumption that the translation memory won't run out and thus it might result
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// in some unexpected errors. If that is case, define WIN32_QEMU_ALLOC_BUFFER to align with QEMU and Unicorn <= 2.0.1 behavior.
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//
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// #define WIN32_QEMU_ALLOC_BUFFER
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#define CONFIG_PLUGIN 1
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@ -869,35 +869,113 @@ static inline void *alloc_code_gen_buffer(struct uc_struct *uc)
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return buf;
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}
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#elif defined(_WIN32)
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#ifdef WIN32_QEMU_ALLOC_BUFFER
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static inline void *alloc_code_gen_buffer(struct uc_struct *uc)
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{
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TCGContext *tcg_ctx = uc->tcg_ctx;
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size_t size = tcg_ctx->code_gen_buffer_size;
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return VirtualAlloc(NULL, size, MEM_RESERVE | MEM_COMMIT,
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PAGE_EXECUTE_READWRITE);
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}
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#define COMMIT_COUNT (1024) // Commit 4MB per exception
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#define CLOSURE_SIZE (4096)
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#ifdef _WIN64
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static LONG code_gen_buffer_handler(PEXCEPTION_POINTERS ptr, struct uc_struct *uc)
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#else
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/*
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The first two DWORD or smaller arguments that are found in the argument list
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from left to right are passed in ECX and EDX registers; all other arguments
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are passed on the stack from right to left.
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*/
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static LONG __fastcall code_gen_buffer_handler(PEXCEPTION_POINTERS ptr, struct uc_struct* uc)
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#endif
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{
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PEXCEPTION_RECORD record = ptr->ExceptionRecord;
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if (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION) {
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uint8_t* base = (uint8_t*)(record->ExceptionInformation[1]);
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uint8_t* left = uc->tcg_ctx->initial_buffer;
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uint8_t* right = left + uc->tcg_ctx->initial_buffer_size;
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if (left && base >= left && base < right) {
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// It's our region
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uint8_t* base_end = base + COMMIT_COUNT * 4096;
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uint32_t size = COMMIT_COUNT * 4096;
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if (base_end >= right) {
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size = base_end - base;
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// whoops, we are almost run out of memory! Commit all instead
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}
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if (VirtualAlloc(base, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE)) {
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return EXCEPTION_CONTINUE_EXECUTION;
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} else {
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return EXCEPTION_CONTINUE_SEARCH;
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}
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}
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}
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return EXCEPTION_CONTINUE_SEARCH;
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}
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static inline void may_remove_handler(struct uc_struct *uc) {
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if (uc->seh_closure) {
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if (uc->seh_handle) {
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RemoveVectoredContinueHandler(uc->seh_handle);
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}
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VirtualFree(uc->seh_closure, 0, MEM_RELEASE);
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}
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}
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static inline void *alloc_code_gen_buffer(struct uc_struct *uc)
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{
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TCGContext *tcg_ctx = uc->tcg_ctx;
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size_t size = tcg_ctx->code_gen_buffer_size;
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uint8_t *closure, *data;
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void* handler = code_gen_buffer_handler;
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void* ptr = VirtualAlloc(NULL, size, MEM_RESERVE,
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PAGE_EXECUTE_READWRITE);
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may_remove_handler(uc);
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// for prolog init
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VirtualAlloc(ptr,
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uc->qemu_real_host_page_size * UC_TCG_REGION_PAGES_COUNT,
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MEM_COMMIT,
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PAGE_EXECUTE_READWRITE);
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return ptr;
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}
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// Naive trampoline implementation
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closure = VirtualAlloc(NULL, CLOSURE_SIZE, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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if (!closure) {
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return NULL;
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}
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uc->seh_closure = closure;
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data = closure + CLOSURE_SIZE /2;
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#ifdef _WIN64
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closure[0] = 0x48; // REX.w
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closure[1] = 0xb8; // mov rax
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memcpy(closure + 2, &data, 8); // mov rax, &data
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// ; rax = &data
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// mov [rax], rdx ; save rdx
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// mov rdx, [rax+0x8] ; move uc pointer to 2nd arg
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// jmp [rax + 0x10] ; go to handler
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// mov rdx, [rax] ; restore rdx
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const char tramp[] = "\x48\x89\x10\x48\x8b\x50\x08\xff\x60\x10\x48\x8b\x10";
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memcpy(closure + 2 + 8, (void*)tramp, sizeof(tramp));
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memcpy(data + 0x8, (void*)&uc, 8);
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memcpy(data + 0x10, (void*)&handler, 8);
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#else
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closure[0] = 0xb8; // mov eax
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memcpy(closure + 1, &data, 4); // mov eax, &data
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// ; eax = &data
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// mov [eax], edx; save edx
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// mov [eax+0x4], ecx; save ecx
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// mov ecx, [esp+4]; get ptr to exception because of cdecl
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// mov edx, [eax+0x8]; get ptr to uc
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// jmp [eax + 0xC]; get ptr to our handler, it's fastcall so we don't clean stack
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// mov edx, [eax] ; restore edx
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// mov ecx, [eax+4] ; restore ecx
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const char tramp[] = "\x89\x10\x89\x48\x04\x8b\x4c\x24\x04\x8b\x50\x08\xff\x60\x0c\x8b\x10\x8b\x48\x04";
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memcpy(closure + 1 + 4, (void*)tramp, sizeof(tramp));
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memcpy(data + 0x8, (void*)&uc, 4);
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memcpy(data + 0xC, (void*)&handler, 4);
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#endif
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uc->seh_handle = AddVectoredExceptionHandler(0, (PVECTORED_EXCEPTION_HANDLER)closure);
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if (!uc->seh_handle) {
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VirtualFree(uc->seh_closure, 0, MEM_RELEASE);
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uc->seh_closure = NULL;
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return NULL;
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}
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return VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_EXECUTE_READWRITE);
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}
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void free_code_gen_buffer(struct uc_struct *uc)
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{
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TCGContext *tcg_ctx = uc->tcg_ctx;
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if (tcg_ctx->initial_buffer) {
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may_remove_handler(uc);
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VirtualFree(tcg_ctx->initial_buffer, 0, MEM_RELEASE);
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}
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}
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@ -28,6 +28,7 @@
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#include <winsock2.h>
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#include <windows.h>
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#include <winnt.h> // For vectorized handler
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#include <ws2tcpip.h>
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#if defined(_WIN64)
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@ -35,11 +35,6 @@
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#include "tcg-apple-jit.h"
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#include "qemu/int128.h"
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// Unicorn: Default region size for win32
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#if defined(_WIN32) && !defined(WIN32_QEMU_ALLOC_BUFFER)
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#define UC_TCG_REGION_PAGES_COUNT (128) // Note less pages may cause unexpected and subtle errors.
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#endif
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/* XXX: make safe guess about sizes */
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#define MAX_OP_PER_INSTR 266
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@ -23,8 +23,6 @@
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*/
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/* define it to use liveness analysis (better code) */
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#include "tcg/tcg.h"
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#include <stdio.h>
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#define USE_TCG_OPTIMIZATIONS
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#include "qemu/osdep.h"
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@ -408,13 +406,7 @@ static void tcg_region_assign(TCGContext *s, size_t curr_region)
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s->code_gen_buffer = start;
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s->code_gen_ptr = start;
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s->code_gen_buffer_size = (char *)end - (char *)start;
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#if defined(WIN32) && !defined(WIN32_QEMU_ALLOC_BUFFER)
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VirtualAlloc(
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s->code_gen_buffer,
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ROUND_UP(s->code_gen_buffer_size, s->uc->qemu_real_host_page_size),
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MEM_COMMIT,
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PAGE_EXECUTE_READWRITE);
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#endif
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memset(s->code_gen_buffer, 0x00, s->code_gen_buffer_size);
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s->code_gen_highwater = (char *)end - TCG_HIGHWATER;
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}
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@ -509,11 +501,7 @@ void tcg_region_init(TCGContext *tcg_ctx)
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size_t n_regions;
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size_t i;
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#if defined(WIN32) && !defined(WIN32_QEMU_ALLOC_BUFFER)
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n_regions = size / (tcg_ctx->uc->qemu_real_host_page_size * UC_TCG_REGION_PAGES_COUNT);
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#else
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n_regions = 1;
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#endif
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/* The first region will be 'aligned - buf' bytes larger than the others */
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aligned = (void *)QEMU_ALIGN_PTR_UP(buf, page_size);
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@ -551,10 +539,6 @@ void tcg_region_init(TCGContext *tcg_ctx)
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tcg_ctx->tree = g_tree_new(tb_tc_cmp);
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#if defined(WIN32) && !defined(WIN32_QEMU_ALLOC_BUFFER)
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// Allocate a region immediately, or the highwater is not set correctly.
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tcg_region_alloc(tcg_ctx);
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#endif
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}
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/*
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