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jit_ssh.c
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jit_ssh.c
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#include "inst.h"
#include "jit.h"
#include "ssh.h"
#include "wasm_jit.h"
#include <stdint.h>
#define FUNC_OFFSET 1
#include "stubs/mulh.h"
#define SSH_JIT_PARAMS __attribute__((unused)) rx_inst_t *inst, uint8_t *buf
#define $item_number 0
#define $mixblock_ptr 1
#define R(x) (x + 2)
// take in `buf` and `rx_inst_t*` and return the number of bytes written to `buf`
typedef uint32_t (*ssh_jit_fn)(SSH_JIT_PARAMS);
// all instructions here are two-address basically x86 instructions
// dest = dest op src
uint32_t ssh_isub_r(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// (local.set $dest (i64.sub (local.get $dest) (local.get $src)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x20, R(inst->src), // local.get $src
0x7d, // i64.sub
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_ixor_r(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// (local.set $dest (i64.xor (local.get $dest) (local.get $src)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x20, R(inst->src), // local.get $src
0x85, // i64.xor
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_iadd_rs(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// basically an lea instruction
// lea $dest, [$dest + $src * scale]
// (local.set $dest (i64.add (local.get $dest) (i64.shl (local.get $src) (i64.const $scale))))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x20, R(inst->src), // local.get $src
0x42, MOD_SHIFT(inst->mod), // i64.const $scale
0x86, // i64.shl
0x7c, // i64.add
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_imul_r(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// (local.set $dest (i64.mul (local.get $dest) (local.get $src)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x20, R(inst->src), // local.get $src
0x7e, // i64.mul
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_iror_c(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// (local.set $dest (i64.rotr (local.get $dest) (i64.const $imm)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x42, inst->imm32 & 63, // i64.const $imm
0x8a, // i64.rotr
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_iadd_c(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// sign extended imm32
int64_t imm64 = (int32_t)inst->imm32;
// (local.set $dest (i64.add (local.get $dest) (i64.const $imm)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x42 // i64.const
});
WASM_I64(imm64); // $imm
WASM_U8_THUNK({
0x7c, // i64.add
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_ixor_c(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// sign extended imm32
int64_t imm64 = (int32_t)inst->imm32;
// (local.set $dest (i64.xor (local.get $dest) (i64.const $imm)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x42 // i64.const
});
WASM_I64(imm64); // $imm
WASM_U8_THUNK({
0x85, // i64.xor
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_imulh_r(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// (local.set $dest (call $mul128hi64 (local.get $dest) (local.get $src)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x20, R(inst->src), // local.get $src
0x10, 1, // call 1 - mul128hi64 (unsigned)
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_ismulh_r(SSH_JIT_PARAMS) {
THUNK_BEGIN;
// (local.set $dest (call $imul128hi64 (local.get $dest) (local.get $src)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x20, R(inst->src), // local.get $src
0x10, 2, // call 2 - imul128hi64 (signed)
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
uint32_t ssh_imul_rcp(SSH_JIT_PARAMS) {
THUNK_BEGIN;
uint64_t reciprocal = jit_reciprocal(inst->imm32);
// (local.set $dest (i64.mul (local.get $dest) (i64.const $imm_rcp)))
WASM_U8_THUNK({
0x20, R(inst->dst), // local.get $dest
0x42, // i64.const
});
WASM_I64(reciprocal); // $imm_rcp
WASM_U8_THUNK({
0x7e, // i64.mul
0x21, R(inst->dst), // local.set $dest
});
THUNK_END;
}
#undef SSH_JIT_PARAMS
static const ssh_jit_fn tables[SS_INST_COUNT] = {
[SS_ISUB_R] = ssh_isub_r,
[SS_IXOR_R] = ssh_ixor_r,
[SS_IADD_RS] = ssh_iadd_rs,
[SS_IMUL_R] = ssh_imul_r,
[SS_IROR_C] = ssh_iror_c,
[SS_IADD_C7] = ssh_iadd_c,
[SS_IXOR_C7] = ssh_ixor_c,
[SS_IADD_C8] = ssh_iadd_c,
[SS_IXOR_C8] = ssh_ixor_c,
[SS_IADD_C9] = ssh_iadd_c,
[SS_IXOR_C9] = ssh_ixor_c,
[SS_IMULH_R] = ssh_imulh_r,
[SS_ISMULH_R] = ssh_ismulh_r,
[SS_IMUL_RCP] = ssh_imul_rcp,
};
// $item_number, reused as $cacheIndex
// cacheIndex = itemNumber % total 64 byte cache items
// (i64) -> () - set $mixblock_ptr
uint32_t access_mix_block(uint8_t *buf, uint8_t *cache_ptr) {
THUNK_BEGIN;
// x % y == x & (y - 1)
// where log2(y) is integer whole
uint32_t mask = (RANDOMX_ARGON_MEMORY * 1024) / 64 - 1;
// to get item index, then multiply by 64
// x * 64 == x << log2(64)
// == x << 6
// v0: i64 = (i64.and (local.get $item_number) (i64.const $mask))
// v1: i32 = (i32.wrap_i64 v0)
// v2: i32 = (i32.shl v1 (i32.const 6))
// v3: i32 = (i32.add v2 (i32.const $cache_ptr))
// (local.set $mixblock_ptr v3)
WASM_U8_THUNK({
0x20, $item_number, // local.get $item_number
0x42, // i64.const
});
WASM_I64(mask); // $mask
WASM_U8_THUNK({
0x83, // i64.and
0xa7, // i32.wrap_i64
0x41, 6, // i32.const 6
0x74, // i32.shl
0x41, // i32.const
});
WASM_I64((uint32_t)cache_ptr); // $cache_ptr
WASM_U8_THUNK({
0x6a, // i32.add
0x21, $mixblock_ptr, // local.set $mixblock_ptr
});
THUNK_END;
}
uint32_t xor_mix_block(uint8_t *buf) {
THUNK_BEGIN;
// for i in 0..8 {
// (local.set $ri (i64.xor (i64.load align=log2(4) offset=i*8 (local.get $mixblock_ptr))) (local.get $ri))
// }
// r0..7 ^= block[0..7]
for (int i = 0; i < 8; i++) {
// compute off_ptr
// 7*8 = 56 < 127 meaning no special LEB128 encoding
WASM_U8_THUNK({
0x20, $mixblock_ptr, // local.get $mixblock_ptr
0x29, 2, i * 8, // i64.load align=2 offset=i*8
0x20, R(i), // local.get $ri
0x85, // i64.xor
0x21, R(i), // local.set $ri
});
}
THUNK_END;
}
uint32_t ssh_jit_programs(ss_program_t prog[RANDOMX_CACHE_ACCESSES], uint8_t *cache_ptr, uint8_t *buf) {
THUNK_BEGIN;
// i = 0
// do {
// block = cache[cacheIndex % total 64 byte items in cache]
// SuperscalarHash[i](r0, r1, r2, r3, r4, r5, r6, r7)
// r0..7 ^= block[0..7]
// cacheIndex = r[longest dependency chain]
// i = i + 1
// } while(i < RANDOMX_CACHE_ACCESSES)
// perform unrolling up to RANDOMX_CACHE_ACCESSES
for (int i = 0; i < RANDOMX_CACHE_ACCESSES; i++) {
ss_program_t *ith_program = &prog[i];
// SuperscalarHash[i](r0, r1, r2, r3, r4, r5, r6, r7)
for (unsigned j = 0; j < ith_program->size; j++) {
rx_inst_t *inst = &ith_program->instructions[j];
ssh_jit_fn fn = tables[inst->opcode];
p += fn(inst, p);
}
// block = cache[cacheIndex % total 64 byte items in cache]
// r0..7 ^= block[0..7]
p += access_mix_block(p, cache_ptr);
p += xor_mix_block(p);
// cacheIndex = r[longest dependency chain]
// (local.set $item_number (local.get $r[ith_program->addr_reg]))
WASM_U8_THUNK({
0x20, R(ith_program->addr_reg), // local.get $r[ith_program->addr_reg]
0x21, $item_number, // local.set $item_number
});
}
THUNK_END;
}
uint32_t jit_ssh(ss_program_t prog[RANDOMX_CACHE_ACCESSES], uint8_t *cache_ptr, uint8_t *buf, bool is_shared_memory, int memory_pages_of_dataset) {
THUNK_BEGIN;
WASM_MAGIC();
// https://webassembly.github.io/spec/core/binary/modules.html#type-section
WASM_SECTION(WASM_SECTION_TYPE, {
WASM_U8(2); // function types = vec(1)
WASM_U8_THUNK({
// function type 0 : (i64) -> (i64, i64, i64, i64, i64, i64, i64, i64)
0x60,
1, // 1 parameter
WASM_TYPE_I64,
8, // 8 return values
WASM_TYPE_I64,
WASM_TYPE_I64,
WASM_TYPE_I64,
WASM_TYPE_I64,
WASM_TYPE_I64,
WASM_TYPE_I64,
WASM_TYPE_I64,
WASM_TYPE_I64,
// function type 1 : (i64, i64) -> i64
0x60,
2, // 2 parameters
WASM_TYPE_I64,
WASM_TYPE_I64,
1, // 1 return value
WASM_TYPE_I64,
});
});
// https://webassembly.github.io/spec/core/binary/modules.html#binary-importsec
WASM_SECTION(WASM_SECTION_IMPORT, {
WASM_U8_THUNK({
1, // imports = vec(1)
// import 0: e.m
1, 'e', 1, 'm', // name = "e.m"
0x02, // import kind = memory
is_shared_memory ? 0x03 : 0x01, // shared or not
});
// limit [..]
WASM_I64(memory_pages_of_dataset);
WASM_I64(memory_pages_of_dataset);
});
// https://webassembly.github.io/spec/core/binary/modules.html#binary-funcsec
WASM_SECTION(WASM_SECTION_FUNCTION, {
WASM_U8_THUNK({
3, // functions = vec(3)
0, // function 0 = function type 0
1, // function 1 = function type 1
1, // function 2 = function type 1
});
});
// https://webassembly.github.io/spec/core/binary/modules.html#binary-exportsec
WASM_SECTION(WASM_SECTION_EXPORT, {
WASM_U8_THUNK({
1, // exports = vec(1)
// export 0: d
1, 'd', // name = "d"
0x00, // export kind = func
0, // function index = 0
});
});
// https://webassembly.github.io/spec/core/binary/modules.html#binary-codesec
WASM_SECTION(WASM_SECTION_CODE, {
WASM_U8(3); // functions = vec(3)
// function 0
WASM_U32_PATCH({
WASM_U8(2); // local entries = vec(2)
WASM_U8(1); // 1 local variable of type i32
WASM_U8(WASM_TYPE_I32); // $mixblock_ptr
WASM_U8(8); // 8 local variables of type i64
WASM_U8(WASM_TYPE_I64); // $r0..$r7
// r0 = (itemNumber + 1) * 6364136223846793005
// r1 = r0 ^ 9298411001130361340
// r2 = r0 ^ 12065312585734608966
// r3 = r0 ^ 9306329213124626780
// r4 = r0 ^ 5281919268842080866
// r5 = r0 ^ 10536153434571861004
// r6 = r0 ^ 3398623926847679864
// r7 = r0 ^ 9549104520008361294
WASM_U8_THUNK({
0x20, $item_number, // local.get $item_number
0x42, 0x01, // i64.const 1
0x7c, // i64.add
0x42, 0xad, 0xfe, 0xd5, 0xe4, 0xd4, 0x85, 0xfd, 0xa8, 0xd8, 0x00, // i64.const 6364136223846793005
0x7e, // i64.mul
0x21, R(0), // local.set $r0
0x20, R(0), // local.get $r0
0x42, 0xfc, 0xc3, 0xd6, 0xcf, 0xa5, 0xf1, 0xa5, 0x85, 0x81, 0x7f, // i64.const 9298411001130361340
0x85, // i64.xor
0x21, R(1), // local.set $r1
0x20, R(0), // local.get $r0
0x42, 0xc6, 0xb0, 0x8b, 0xc6, 0xf3, 0xbb, 0xa6, 0xb8, 0xa7, 0x7f, // i64.const 12065312585734608966
0x85, // i64.xor
0x21, R(2), // local.set $r2
0x20, R(0), // local.get $r0
0x42, 0xdc, 0x92, 0x89, 0xf9, 0xcb, 0xa3, 0xae, 0x93, 0x81, 0x7f, // i64.const 9306329213124626780
0x85, // i64.xor
0x21, R(3), // local.set $r3
0x20, R(0), // local.get $r0
0x42, 0xe2, 0x94, 0xfe, 0xbc, 0xf1, 0xb2, 0xc9, 0xa6, 0xc9, 0x00, // i64.const 5281919268842080866
0x85, // i64.xor
0x21, R(4), // local.set $r4
0x20, R(0), // local.get $r0
0x42, 0x8c, 0xd8, 0xab, 0xf5, 0x9c, 0xf7, 0xfb, 0x9b, 0x92, 0x7f, // i64.const 10536153434571861004
0x85, // i64.xor
0x21, R(5), // local.set $r5
0x20, R(0), // local.get $r0
0x42, 0xf8, 0xda, 0x98, 0xe7, 0xc6, 0xce, 0x95, 0x95, 0x2f, // i64.const 3398623926847679864
0x85, // i64.xor
0x21, R(6), // local.set $r6
0x20, R(0), // local.get $r0
0x42, 0xce, 0xca, 0xb3, 0xb1, 0xfb, 0xfe, 0xce, 0xc2, 0x84, 0x7f, // i64.const 9549104520008361294
0x85, // i64.xor
0x21, R(7), // local.set $r7
});
p += ssh_jit_programs(prog, cache_ptr, p);
// return r0, r1, r2, r3, r4, r5, r6, r7
WASM_U8_THUNK({
0x20, R(0), // local.get $r0
0x20, R(1), // local.get $r1
0x20, R(2), // local.get $r2
0x20, R(3), // local.get $r3
0x20, R(4), // local.get $r4
0x20, R(5), // local.get $r5
0x20, R(6), // local.get $r6
0x20, R(7), // local.get $r7
});
WASM_U8(0x0b); // end
});
// function 1 - mul128hi
WASM_U32_WITH_STUB(STUB_MUL128HI);
// function 2 - imul128hi
WASM_U32_WITH_STUB(STUB_IMUL128HI);
});
// assign local names for debug purposes
#define LOCAL_NAME(idx, name) \
WASM_U8(idx); \
WASM_U8_SHORT_NAME(name)
// https://webassembly.github.io/spec/core/binary/modules.html#custom-section
// https://webassembly.github.io/spec/core/appendix/custom.html#name-section
WASM_SECTION(WASM_SECTION_CUSTOM, {
WASM_U8_THUNK({
4, 'n', 'a', 'm', 'e', // name = "name"
});
// function names (subsection)
WASM_SECTION(0x01, {
// vec(function_idx, name)
WASM_U8(3); // entries = vec(3)
WASM_U8(0); // function index 0
WASM_U8_SHORT_NAME("superscalarhash");
WASM_U8(1); // function index 1
WASM_U8_SHORT_NAME("mul128hi");
WASM_U8(2); // function index 2
WASM_U8_SHORT_NAME("imul128hi");
});
// local names (subsection)
WASM_SECTION(0x02, {
// vec(function_idx, vec(idx, name))
WASM_U8(1); // entries = vec(1)
WASM_U8(0); // function index 0
WASM_U8(10); // locals = vec(10)
LOCAL_NAME($item_number, "item_number");
LOCAL_NAME($mixblock_ptr, "mixblock_ptr");
LOCAL_NAME(R(0), "r0");
LOCAL_NAME(R(1), "r1");
LOCAL_NAME(R(2), "r2");
LOCAL_NAME(R(3), "r3");
LOCAL_NAME(R(4), "r4");
LOCAL_NAME(R(5), "r5");
LOCAL_NAME(R(6), "r6");
LOCAL_NAME(R(7), "r7");
});
});
#undef LOCAL_NAME
THUNK_END;
}