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tcg: Add insn_start_words to TCGContext

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This will enable replacement of TARGET_INSN_START_WORDS in tcg.c.
Split out "tcg/insn-start-words.h" and use it in target/.

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-03-31 21:30:31 -07:00
parent e03291cd9a
commit 747bd69d0f
9 changed files with 58 additions and 30 deletions
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20
accel/tcg/translate-all.c
View file

@ -64,6 +64,7 @@
#include "tb-context.h"
#include "internal.h"
#include "perf.h"
#include "tcg/insn-start-words.h"
TBContext tb_ctx;
@ -127,22 +128,26 @@ static int64_t decode_sleb128(const uint8_t **pp)
static int encode_search(TranslationBlock *tb, uint8_t *block)
{
uint8_t *highwater = tcg_ctx->code_gen_highwater;
uint64_t *insn_data = tcg_ctx->gen_insn_data;
uint16_t *insn_end_off = tcg_ctx->gen_insn_end_off;
uint8_t *p = block;
int i, j, n;
for (i = 0, n = tb->icount; i < n; ++i) {
uint64_t prev;
uint64_t prev, curr;
for (j = 0; j < TARGET_INSN_START_WORDS; ++j) {
if (i == 0) {
prev = (!(tb_cflags(tb) & CF_PCREL) && j == 0 ? tb->pc : 0);
} else {
prev = tcg_ctx->gen_insn_data[i - 1][j];
prev = insn_data[(i - 1) * TARGET_INSN_START_WORDS + j];
}
p = encode_sleb128(p, tcg_ctx->gen_insn_data[i][j] - prev);
curr = insn_data[i * TARGET_INSN_START_WORDS + j];
p = encode_sleb128(p, curr - prev);
}
prev = (i == 0 ? 0 : tcg_ctx->gen_insn_end_off[i - 1]);
p = encode_sleb128(p, tcg_ctx->gen_insn_end_off[i] - prev);
prev = (i == 0 ? 0 : insn_end_off[i - 1]);
curr = insn_end_off[i];
p = encode_sleb128(p, curr - prev);
/* Test for (pending) buffer overflow. The assumption is that any
one row beginning below the high water mark cannot overrun
@ -358,6 +363,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
tcg_ctx->tlb_fast_offset =
(int)offsetof(ArchCPU, neg.tlb.f) - (int)offsetof(ArchCPU, env);
#endif
tcg_ctx->insn_start_words = TARGET_INSN_START_WORDS;
tb_overflow:
@ -451,7 +457,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
fprintf(logfile, "OUT: [size=%d]\n", gen_code_size);
fprintf(logfile,
" -- guest addr 0x%016" PRIx64 " + tb prologue\n",
tcg_ctx->gen_insn_data[insn][0]);
tcg_ctx->gen_insn_data[insn * TARGET_INSN_START_WORDS]);
chunk_start = tcg_ctx->gen_insn_end_off[insn];
disas(logfile, tb->tc.ptr, chunk_start);
@ -464,7 +470,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
size_t chunk_end = tcg_ctx->gen_insn_end_off[insn];
if (chunk_end > chunk_start) {
fprintf(logfile, " -- guest addr 0x%016" PRIx64 "\n",
tcg_ctx->gen_insn_data[insn][0]);
tcg_ctx->gen_insn_data[insn * TARGET_INSN_START_WORDS]);
disas(logfile, tb->tc.ptr + chunk_start,
chunk_end - chunk_start);
chunk_start = chunk_end;