gh-mirror/mikepaul-LuaJIT
1
0
Fork 0
mirror of https://github.com/LuaJIT/LuaJIT.git synced 2025-02-07 15:14:08 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Adding s390x support for DynASM

Browse Source
This commit is contained in:
Aditya Bisht 2022-06-23 14:05:10 +05:30
parent 0065cff7e0
commit bb784b48a6
No known key found for this signature in database
GPG Key ID: 0A812A321D95394B
2 changed files with 2178 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

546
dynasm/dasm_s390x.h Normal file
View File

@ -0,0 +1,546 @@
/*
** DynASM s390x encoding engine.
** Copyright (C) 2005-2022 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 "s390x"
#ifndef DASM_EXTERN
#define DASM_EXTERN(a,b,c,d) 0
#endif
/* Action definitions. */
enum {
DASM_STOP, DASM_SECTION, DASM_ESC, DASM_REL_EXT,
/* The following actions need a buffer position. */
DASM_ALIGN, DASM_REL_LG, DASM_LABEL_LG,
/* The following actions also have an argument. */
DASM_REL_PC, DASM_LABEL_PC,
DASM_DISP12, DASM_DISP20,
DASM_IMM8, DASM_IMM16, DASM_IMM32,
DASM_LEN8R,DASM_LEN4HR,DASM_LEN4LR,
DASM__MAX
};
/* 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_REL 0x15000000
#define DASM_S_UNDEF_LG 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 short *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|(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|(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;
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) {
unsigned short ins = *p++;
unsigned short action = ins;
if (action >= DASM__MAX) {
ofs += 2;
continue;
}
int *pl, n = action >= DASM_REL_PC ? va_arg(ap, int) : 0;
switch (action) {
case DASM_STOP:
goto stop;
case DASM_SECTION:
n = *p++ & 255;
CK(n < D->maxsection, RANGE_SEC);
D->section = &D->sections[n];
goto stop;
case DASM_ESC:
p++;
ofs += 2;
break;
case DASM_REL_EXT:
p++;
ofs += 4;
break;
case DASM_ALIGN:
ofs += *p++;
b[pos++] = ofs;
break;
case DASM_REL_LG:
if (p[-2] >> 12 == 0xc) { /* RIL instruction needs 32-bit immediate. */
ofs += 2;
}
n = *p++ - 10;
pl = D->lglabels + n;
/* Bkwd rel or global. */
if (n >= 0) {
CK(n >= 10 || *pl < 0, RANGE_LG);
CKPL(lg, LG);
goto putrel;
}
pl += 10;
n = *pl;
if (n < 0)
n = 0; /* Start new chain for fwd rel if label exists. */
goto linkrel;
case DASM_REL_PC:
if (p[-2] >> 12 == 0xc) { /* RIL instruction needs 32-bit immediate. */
ofs += 2;
}
pl = D->pclabels + n;
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;
}
ofs += 2;
pos++;
break;
case DASM_LABEL_LG:
pl = D->lglabels + *p++ - 10;
CKPL(lg, LG);
goto putlabel;
case DASM_LABEL_PC:
pl = D->pclabels + n;
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_IMM8:
b[pos++] = n;
break;
case DASM_IMM16:
CK(((short)n) == n || ((unsigned short)n) == n, RANGE_I); /* TODO: is this the right way to handle unsigned immediates? */
ofs += 2;
b[pos++] = n;
break;
case DASM_IMM32:
ofs += 4;
b[pos++] = n;
break;
case DASM_DISP20:
CK(-(1 << 19) <= n && n < (1 << 19), RANGE_I);
b[pos++] = n;
break;
case DASM_DISP12:
CK((n >> 12) == 0, RANGE_I);
b[pos++] = n;
break;
case DASM_LEN8R:
CK(n >= 1 && n <= 256, RANGE_I);
b[pos++] = n;
break;
case DASM_LEN4HR:
case DASM_LEN4LR:
CK(n >= 1 && n <= 128, RANGE_I);
b[pos++] = n;
break;
}
}
stop:
va_end(ap);
sec->pos = pos;
sec->ofs = ofs;
}
#undef CK
/* Pass 2: Link sections, shrink 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 = 20; 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) {
unsigned short ins = *p++;
unsigned short action = ins;
switch (action) {
case DASM_STOP:
case DASM_SECTION:
goto stop;
case DASM_ESC:
p++;
break;
case DASM_REL_EXT:
p++;
break;
case DASM_ALIGN:
ofs -= (b[pos++] + ofs) & *p++;
break;
case DASM_REL_LG:
case DASM_REL_PC:
p++;
pos++;
break;
case DASM_LABEL_LG:
case DASM_LABEL_PC:
p++;
b[pos++] += ofs;
break;
case DASM_IMM8:
case DASM_IMM16:
case DASM_IMM32:
case DASM_DISP20:
case DASM_DISP12:
case DASM_LEN8R:
case DASM_LEN4HR:
case DASM_LEN4LR:
pos++;
break;
}
}
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;
}
#ifdef DASM_CHECKS
#define CK(x, st) \
do { if (!(x)) return DASM_S_##st|(p-D->actionlist-1); } while (0)
#else
#define CK(x, st) ((void)0)
#endif
/* Pass 3: Encode sections. */
int dasm_encode(Dst_DECL, void *buffer)
{
dasm_State *D = Dst_REF;
char *base = (char *)buffer;
unsigned short *cp = (unsigned short *)buffer;
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++;
while (1) {
unsigned short ins = *p++;
unsigned short action = ins;
int n = (action >= DASM_ALIGN && action < DASM__MAX) ? *b++ : 0;
switch (action) {
case DASM_STOP:
case DASM_SECTION:
goto stop;
case DASM_ESC:
*cp++ = *p++;
break;
case DASM_REL_EXT:
n = DASM_EXTERN(Dst, (unsigned char *)cp, *p++, 1) - 4;
goto patchrel;
case DASM_ALIGN:
ins = *p++;
/* TODO: emit 4-byte noprs instead of 2-byte nops where possible. */
while ((((char *)cp - base) & ins))
*cp++ = 0x0700; /* nop */
break;
case DASM_REL_LG:
CK(n >= 0, UNDEF_LG);
case DASM_REL_PC:
CK(n >= 0, UNDEF_PC);
n = *DASM_POS2PTR(D, n) - (int)((char *)cp - base);
p++; /* skip argument */
patchrel:
/* Offsets are halfword aligned (so need to be halved). */
n += 2; /* Offset is relative to start of instruction. */
if (cp[-1] >> 12 == 0xc) {
*cp++ = n >> 17;
} else {
CK(-(1 << 16) <= n && n < (1 << 16) && (n & 1) == 0, RANGE_LG);
}
*cp++ = n >> 1;
break;
case DASM_LABEL_LG:
ins = *p++;
if (ins >= 20)
D->globals[ins - 10] = (void *)(base + n);
break;
case DASM_LABEL_PC:
break;
case DASM_IMM8:
cp[-1] |= n & 0xff;
break;
case DASM_IMM16:
*cp++ = n;
break;
case DASM_IMM32:
*cp++ = n >> 16;
*cp++ = n;
break;
case DASM_DISP20:
cp[-2] |= n & 0xfff;
cp[-1] |= (n >> 4) & 0xff00;
break;
case DASM_DISP12:
cp[-1] |= n & 0xfff;
break;
case DASM_LEN8R:
cp[-1] |= (n - 1) & 0xff;
break;
case DASM_LEN4HR:
cp[-1] |= ((n - 1) << 4) & 0xf0;
break;
case DASM_LEN4LR:
cp[-1] |= (n - 1) & 0x0f;
break;
default:
*cp++ = ins;
break;
}
}
stop:(void)0;
}
}
if (base + D->codesize != (char *)cp) /* Check for phase errors. */
return DASM_S_PHASE;
return DASM_S_OK;
}
#undef CK
/* 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_LG | 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 | (D->section - D->sections);
return D->status;
}
#endif

1632
dynasm/dasm_s390x.lua Normal file
View File

File diff suppressed because it is too large Load Diff