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Diffstat (limited to 'third_party/dynasm/dasm_x86.h')
-rw-r--r--third_party/dynasm/dasm_x86.h470
1 files changed, 0 insertions, 470 deletions
diff --git a/third_party/dynasm/dasm_x86.h b/third_party/dynasm/dasm_x86.h
deleted file mode 100644
index 7c6dcd3..0000000
--- a/third_party/dynasm/dasm_x86.h
+++ /dev/null
@@ -1,470 +0,0 @@
-/*
-** DynASM x86 encoding engine.
-** Copyright (C) 2005-2012 Mike Pall. All rights reserved.
-** Released under the MIT license. See dynasm.lua for full copyright notice.
-*/
-
-#include <stddef.h>
-#include <stdarg.h>
-#include <string.h>
-#include <stdlib.h>
-
-#define DASM_ARCH "x86"
-
-#ifndef DASM_EXTERN
-#define DASM_EXTERN(a,b,c,d) 0
-#endif
-
-/* Action definitions. DASM_STOP must be 255. */
-enum {
- DASM_DISP = 233,
- DASM_IMM_S, DASM_IMM_B, DASM_IMM_W, DASM_IMM_D, DASM_IMM_WB, DASM_IMM_DB,
- DASM_VREG, DASM_SPACE, DASM_SETLABEL, DASM_REL_A, DASM_REL_LG, DASM_REL_PC,
- DASM_IMM_LG, DASM_IMM_PC, DASM_LABEL_LG, DASM_LABEL_PC, DASM_ALIGN,
- DASM_EXTERN, DASM_ESC, DASM_MARK, DASM_SECTION, DASM_STOP
-};
-
-/* Maximum number of section buffer positions for a single dasm_put() call. */
-#define DASM_MAXSECPOS 25
-
-/* DynASM encoder status codes. Action list offset or number are or'ed in. */
-#define DASM_S_OK 0x00000000
-#define DASM_S_NOMEM 0x01000000
-#define DASM_S_PHASE 0x02000000
-#define DASM_S_MATCH_SEC 0x03000000
-#define DASM_S_RANGE_I 0x11000000
-#define DASM_S_RANGE_SEC 0x12000000
-#define DASM_S_RANGE_LG 0x13000000
-#define DASM_S_RANGE_PC 0x14000000
-#define DASM_S_RANGE_VREG 0x15000000
-#define DASM_S_UNDEF_L 0x21000000
-#define DASM_S_UNDEF_PC 0x22000000
-
-/* Macros to convert positions (8 bit section + 24 bit index). */
-#define DASM_POS2IDX(pos) ((pos)&0x00ffffff)
-#define DASM_POS2BIAS(pos) ((pos)&0xff000000)
-#define DASM_SEC2POS(sec) ((sec)<<24)
-#define DASM_POS2SEC(pos) ((pos)>>24)
-#define DASM_POS2PTR(D, pos) (D->sections[DASM_POS2SEC(pos)].rbuf + (pos))
-
-/* Action list type. */
-typedef const unsigned char *dasm_ActList;
-
-/* Per-section structure. */
-typedef struct dasm_Section {
- int *rbuf; /* Biased buffer pointer (negative section bias). */
- int *buf; /* True buffer pointer. */
- size_t bsize; /* Buffer size in bytes. */
- int pos; /* Biased buffer position. */
- int epos; /* End of biased buffer position - max single put. */
- int ofs; /* Byte offset into section. */
-} dasm_Section;
-
-/* Core structure holding the DynASM encoding state. */
-struct dasm_State {
- size_t psize; /* Allocated size of this structure. */
- dasm_ActList actionlist; /* Current actionlist pointer. */
- int *lglabels; /* Local/global chain/pos ptrs. */
- size_t lgsize;
- int *pclabels; /* PC label chains/pos ptrs. */
- size_t pcsize;
- void **globals; /* Array of globals (bias -10). */
- dasm_Section *section; /* Pointer to active section. */
- size_t codesize; /* Total size of all code sections. */
- int maxsection; /* 0 <= sectionidx < maxsection. */
- int status; /* Status code. */
- dasm_Section sections[1]; /* All sections. Alloc-extended. */
-};
-
-/* The size of the core structure depends on the max. number of sections. */
-#define DASM_PSZ(ms) (sizeof(dasm_State)+(ms-1)*sizeof(dasm_Section))
-
-
-/* Initialize DynASM state. */
-void dasm_init(Dst_DECL, int maxsection)
-{
- dasm_State *D;
- size_t psz = 0;
- int i;
- Dst_REF = NULL;
- DASM_M_GROW(Dst, struct dasm_State, Dst_REF, psz, DASM_PSZ(maxsection));
- D = Dst_REF;
- D->psize = psz;
- D->lglabels = NULL;
- D->lgsize = 0;
- D->pclabels = NULL;
- D->pcsize = 0;
- D->globals = NULL;
- D->maxsection = maxsection;
- for (i = 0; i < maxsection; i++) {
- D->sections[i].buf = NULL; /* Need this for pass3. */
- D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i);
- D->sections[i].bsize = 0;
- D->sections[i].epos = 0; /* Wrong, but is recalculated after resize. */
- }
-}
-
-/* Free DynASM state. */
-void dasm_free(Dst_DECL)
-{
- dasm_State *D = Dst_REF;
- int i;
- for (i = 0; i < D->maxsection; i++)
- if (D->sections[i].buf)
- DASM_M_FREE(Dst, D->sections[i].buf, D->sections[i].bsize);
- if (D->pclabels) DASM_M_FREE(Dst, D->pclabels, D->pcsize);
- if (D->lglabels) DASM_M_FREE(Dst, D->lglabels, D->lgsize);
- DASM_M_FREE(Dst, D, D->psize);
-}
-
-/* Setup global label array. Must be called before dasm_setup(). */
-void dasm_setupglobal(Dst_DECL, void **gl, unsigned int maxgl)
-{
- dasm_State *D = Dst_REF;
- D->globals = gl - 10; /* Negative bias to compensate for locals. */
- DASM_M_GROW(Dst, int, D->lglabels, D->lgsize, (10+maxgl)*sizeof(int));
-}
-
-/* Grow PC label array. Can be called after dasm_setup(), too. */
-void dasm_growpc(Dst_DECL, unsigned int maxpc)
-{
- dasm_State *D = Dst_REF;
- size_t osz = D->pcsize;
- DASM_M_GROW(Dst, int, D->pclabels, D->pcsize, maxpc*sizeof(int));
- memset((void *)(((unsigned char *)D->pclabels)+osz), 0, D->pcsize-osz);
-}
-
-/* Setup encoder. */
-void dasm_setup(Dst_DECL, const void *actionlist)
-{
- dasm_State *D = Dst_REF;
- int i;
- D->actionlist = (dasm_ActList)actionlist;
- D->status = DASM_S_OK;
- D->section = &D->sections[0];
- memset((void *)D->lglabels, 0, D->lgsize);
- if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
- for (i = 0; i < D->maxsection; i++) {
- D->sections[i].pos = DASM_SEC2POS(i);
- D->sections[i].ofs = 0;
- }
-}
-
-
-#ifdef DASM_CHECKS
-#define CK(x, st) \
- do { if (!(x)) { \
- D->status = DASM_S_##st|(int)(p-D->actionlist-1); return; } } while (0)
-#define CKPL(kind, st) \
- do { if ((size_t)((char *)pl-(char *)D->kind##labels) >= D->kind##size) { \
- D->status=DASM_S_RANGE_##st|(int)(p-D->actionlist-1); return; } } while (0)
-#else
-#define CK(x, st) ((void)0)
-#define CKPL(kind, st) ((void)0)
-#endif
-
-/* Pass 1: Store actions and args, link branches/labels, estimate offsets. */
-void dasm_put(Dst_DECL, int start, ...)
-{
- va_list ap;
- dasm_State *D = Dst_REF;
- dasm_ActList p = D->actionlist + start;
- dasm_Section *sec = D->section;
- int pos = sec->pos, ofs = sec->ofs, mrm = 4;
- int *b;
-
- if (pos >= sec->epos) {
- DASM_M_GROW(Dst, int, sec->buf, sec->bsize,
- sec->bsize + 2*DASM_MAXSECPOS*sizeof(int));
- sec->rbuf = sec->buf - DASM_POS2BIAS(pos);
- sec->epos = (int)sec->bsize/sizeof(int) - DASM_MAXSECPOS+DASM_POS2BIAS(pos);
- }
-
- b = sec->rbuf;
- b[pos++] = start;
-
- va_start(ap, start);
- while (1) {
- int action = *p++;
- if (action < DASM_DISP) {
- ofs++;
- } else if (action <= DASM_REL_A) {
- int n = va_arg(ap, int);
- b[pos++] = n;
- switch (action) {
- case DASM_DISP:
- if (n == 0) { if ((mrm&7) == 4) mrm = p[-2]; if ((mrm&7) != 5) break; }
- case DASM_IMM_DB: if (((n+128)&-256) == 0) goto ob;
- case DASM_REL_A: /* Assumes ptrdiff_t is int. !x64 */
- case DASM_IMM_D: ofs += 4; break;
- case DASM_IMM_S: CK(((n+128)&-256) == 0, RANGE_I); goto ob;
- case DASM_IMM_B: CK((n&-256) == 0, RANGE_I); ob: ofs++; break;
- case DASM_IMM_WB: if (((n+128)&-256) == 0) goto ob;
- case DASM_IMM_W: CK((n&-65536) == 0, RANGE_I); ofs += 2; break;
- case DASM_SPACE: p++; ofs += n; break;
- case DASM_SETLABEL: b[pos-2] = -0x40000000; break; /* Neg. label ofs. */
- case DASM_VREG: CK((n&-8) == 0 && (n != 4 || (*p&1) == 0), RANGE_VREG);
- if (*p++ == 1 && *p == DASM_DISP) mrm = n; continue;
- }
- mrm = 4;
- } else {
- int *pl, n;
- switch (action) {
- case DASM_REL_LG:
- case DASM_IMM_LG:
- n = *p++; pl = D->lglabels + n;
- if (n <= 246) { CKPL(lg, LG); goto putrel; } /* Bkwd rel or global. */
- pl -= 246; n = *pl;
- if (n < 0) n = 0; /* Start new chain for fwd rel if label exists. */
- goto linkrel;
- case DASM_REL_PC:
- case DASM_IMM_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC);
- putrel:
- n = *pl;
- if (n < 0) { /* Label exists. Get label pos and store it. */
- b[pos] = -n;
- } else {
- linkrel:
- b[pos] = n; /* Else link to rel chain, anchored at label. */
- *pl = pos;
- }
- pos++;
- ofs += 4; /* Maximum offset needed. */
- if (action == DASM_REL_LG || action == DASM_REL_PC)
- b[pos++] = ofs; /* Store pass1 offset estimate. */
- break;
- case DASM_LABEL_LG: pl = D->lglabels + *p++; CKPL(lg, LG); goto putlabel;
- case DASM_LABEL_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC);
- putlabel:
- n = *pl; /* n > 0: Collapse rel chain and replace with label pos. */
- while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = pos; }
- *pl = -pos; /* Label exists now. */
- b[pos++] = ofs; /* Store pass1 offset estimate. */
- break;
- case DASM_ALIGN:
- ofs += *p++; /* Maximum alignment needed (arg is 2**n-1). */
- b[pos++] = ofs; /* Store pass1 offset estimate. */
- break;
- case DASM_EXTERN: p += 2; ofs += 4; break;
- case DASM_ESC: p++; ofs++; break;
- case DASM_MARK: mrm = p[-2]; break;
- case DASM_SECTION:
- n = *p; CK(n < D->maxsection, RANGE_SEC); D->section = &D->sections[n];
- case DASM_STOP: goto stop;
- }
- }
- }
-stop:
- va_end(ap);
- sec->pos = pos;
- sec->ofs = ofs;
-}
-#undef CK
-
-/* Pass 2: Link sections, shrink branches/aligns, fix label offsets. */
-int dasm_link(Dst_DECL, size_t *szp)
-{
- dasm_State *D = Dst_REF;
- int secnum;
- int ofs = 0;
-
-#ifdef DASM_CHECKS
- *szp = 0;
- if (D->status != DASM_S_OK) return D->status;
- {
- int pc;
- for (pc = 0; pc*sizeof(int) < D->pcsize; pc++)
- if (D->pclabels[pc] > 0) return DASM_S_UNDEF_PC|pc;
- }
-#endif
-
- { /* Handle globals not defined in this translation unit. */
- int idx;
- for (idx = 10; idx*sizeof(int) < D->lgsize; idx++) {
- int n = D->lglabels[idx];
- /* Undefined label: Collapse rel chain and replace with marker (< 0). */
- while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = -idx; }
- }
- }
-
- /* Combine all code sections. No support for data sections (yet). */
- for (secnum = 0; secnum < D->maxsection; secnum++) {
- dasm_Section *sec = D->sections + secnum;
- int *b = sec->rbuf;
- int pos = DASM_SEC2POS(secnum);
- int lastpos = sec->pos;
-
- while (pos != lastpos) {
- dasm_ActList p = D->actionlist + b[pos++];
- while (1) {
- int op, action = *p++;
- switch (action) {
- case DASM_REL_LG: p++; op = p[-3]; goto rel_pc;
- case DASM_REL_PC: op = p[-2]; rel_pc: {
- int shrink = op == 0xe9 ? 3 : ((op&0xf0) == 0x80 ? 4 : 0);
- if (shrink) { /* Shrinkable branch opcode? */
- int lofs, lpos = b[pos];
- if (lpos < 0) goto noshrink; /* Ext global? */
- lofs = *DASM_POS2PTR(D, lpos);
- if (lpos > pos) { /* Fwd label: add cumulative section offsets. */
- int i;
- for (i = secnum; i < DASM_POS2SEC(lpos); i++)
- lofs += D->sections[i].ofs;
- } else {
- lofs -= ofs; /* Bkwd label: unfix offset. */
- }
- lofs -= b[pos+1]; /* Short branch ok? */
- if (lofs >= -128-shrink && lofs <= 127) ofs -= shrink; /* Yes. */
- else { noshrink: shrink = 0; } /* No, cannot shrink op. */
- }
- b[pos+1] = shrink;
- pos += 2;
- break;
- }
- case DASM_SPACE: case DASM_IMM_LG: case DASM_VREG: p++;
- case DASM_DISP: case DASM_IMM_S: case DASM_IMM_B: case DASM_IMM_W:
- case DASM_IMM_D: case DASM_IMM_WB: case DASM_IMM_DB:
- case DASM_SETLABEL: case DASM_REL_A: case DASM_IMM_PC: pos++; break;
- case DASM_LABEL_LG: p++;
- case DASM_LABEL_PC: b[pos++] += ofs; break; /* Fix label offset. */
- case DASM_ALIGN: ofs -= (b[pos++]+ofs)&*p++; break; /* Adjust ofs. */
- case DASM_EXTERN: p += 2; break;
- case DASM_ESC: p++; break;
- case DASM_MARK: break;
- case DASM_SECTION: case DASM_STOP: goto stop;
- }
- }
- stop: (void)0;
- }
- ofs += sec->ofs; /* Next section starts right after current section. */
- }
-
- D->codesize = ofs; /* Total size of all code sections */
- *szp = ofs;
- return DASM_S_OK;
-}
-
-#define dasmb(x) *cp++ = (unsigned char)(x)
-#ifndef DASM_ALIGNED_WRITES
-#define dasmw(x) \
- do { *((unsigned short *)cp) = (unsigned short)(x); cp+=2; } while (0)
-#define dasmd(x) \
- do { *((unsigned int *)cp) = (unsigned int)(x); cp+=4; } while (0)
-#else
-#define dasmw(x) do { dasmb(x); dasmb((x)>>8); } while (0)
-#define dasmd(x) do { dasmw(x); dasmw((x)>>16); } while (0)
-#endif
-
-/* Pass 3: Encode sections. */
-int dasm_encode(Dst_DECL, void *buffer)
-{
- dasm_State *D = Dst_REF;
- unsigned char *base = (unsigned char *)buffer;
- unsigned char *cp = base;
- int secnum;
-
- /* Encode all code sections. No support for data sections (yet). */
- for (secnum = 0; secnum < D->maxsection; secnum++) {
- dasm_Section *sec = D->sections + secnum;
- int *b = sec->buf;
- int *endb = sec->rbuf + sec->pos;
-
- while (b != endb) {
- dasm_ActList p = D->actionlist + *b++;
- unsigned char *mark = NULL;
- while (1) {
- int action = *p++;
- int n = (action >= DASM_DISP && action <= DASM_ALIGN) ? *b++ : 0;
- switch (action) {
- case DASM_DISP: if (!mark) mark = cp; {
- unsigned char *mm = mark;
- if (*p != DASM_IMM_DB && *p != DASM_IMM_WB) mark = NULL;
- if (n == 0) { int mrm = mm[-1]&7; if (mrm == 4) mrm = mm[0]&7;
- if (mrm != 5) { mm[-1] -= 0x80; break; } }
- if (((n+128) & -256) != 0) goto wd; else mm[-1] -= 0x40;
- }
- case DASM_IMM_S: case DASM_IMM_B: wb: dasmb(n); break;
- case DASM_IMM_DB: if (((n+128)&-256) == 0) {
- db: if (!mark) mark = cp; mark[-2] += 2; mark = NULL; goto wb;
- } else mark = NULL;
- case DASM_IMM_D: wd: dasmd(n); break;
- case DASM_IMM_WB: if (((n+128)&-256) == 0) goto db; else mark = NULL;
- case DASM_IMM_W: dasmw(n); break;
- case DASM_VREG: { int t = *p++; if (t >= 2) n<<=3; cp[-1] |= n; break; }
- case DASM_REL_LG: p++; if (n >= 0) goto rel_pc;
- b++; n = (int)(ptrdiff_t)D->globals[-n];
- case DASM_REL_A: rel_a: n -= (int)(ptrdiff_t)(cp+4); goto wd; /* !x64 */
- case DASM_REL_PC: rel_pc: {
- int shrink = *b++;
- int *pb = DASM_POS2PTR(D, n); if (*pb < 0) { n = pb[1]; goto rel_a; }
- n = *pb - ((int)(cp-base) + 4-shrink);
- if (shrink == 0) goto wd;
- if (shrink == 4) { cp--; cp[-1] = *cp-0x10; } else cp[-1] = 0xeb;
- goto wb;
- }
- case DASM_IMM_LG:
- p++; if (n < 0) { n = (int)(ptrdiff_t)D->globals[-n]; goto wd; }
- case DASM_IMM_PC: {
- int *pb = DASM_POS2PTR(D, n);
- n = *pb < 0 ? pb[1] : (*pb + (int)(ptrdiff_t)base);
- goto wd;
- }
- case DASM_LABEL_LG: {
- int idx = *p++;
- if (idx >= 10)
- D->globals[idx] = (void *)(base + (*p == DASM_SETLABEL ? *b : n));
- break;
- }
- case DASM_LABEL_PC: case DASM_SETLABEL: break;
- case DASM_SPACE: { int fill = *p++; while (n--) *cp++ = fill; break; }
- case DASM_ALIGN:
- n = *p++;
- while (((cp-base) & n)) *cp++ = 0x90; /* nop */
- break;
- case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd;
- case DASM_MARK: mark = cp; break;
- case DASM_ESC: action = *p++;
- default: *cp++ = action; break;
- case DASM_SECTION: case DASM_STOP: goto stop;
- }
- }
- stop: (void)0;
- }
- }
-
- if (base + D->codesize != cp) /* Check for phase errors. */
- return DASM_S_PHASE;
- return DASM_S_OK;
-}
-
-/* Get PC label offset. */
-int dasm_getpclabel(Dst_DECL, unsigned int pc)
-{
- dasm_State *D = Dst_REF;
- if (pc*sizeof(int) < D->pcsize) {
- int pos = D->pclabels[pc];
- if (pos < 0) return *DASM_POS2PTR(D, -pos);
- if (pos > 0) return -1; /* Undefined. */
- }
- return -2; /* Unused or out of range. */
-}
-
-#ifdef DASM_CHECKS
-/* Optional sanity checker to call between isolated encoding steps. */
-int dasm_checkstep(Dst_DECL, int secmatch)
-{
- dasm_State *D = Dst_REF;
- if (D->status == DASM_S_OK) {
- int i;
- for (i = 1; i <= 9; i++) {
- if (D->lglabels[i] > 0) { D->status = DASM_S_UNDEF_L|i; break; }
- D->lglabels[i] = 0;
- }
- }
- if (D->status == DASM_S_OK && secmatch >= 0 &&
- D->section != &D->sections[secmatch])
- D->status = DASM_S_MATCH_SEC|(int)(D->section-D->sections);
- return D->status;
-}
-#endif
-
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