mirror of
https://github.com/RetroPortingToolKit/psxrecomp
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Pegasus
69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
#ifndef PSX_SOURCE_RAM_PAGE_PROBE_H
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#define PSX_SOURCE_RAM_PAGE_PROBE_H
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "source_observer_limit.h"
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/* Passive diagnostic index. A hash mismatch locates bytes to inspect; hashes
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* are not a substitute for comparing the selected raw RAM snapshots. */
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static uint64_t source_ram_page_hash(const uint8_t *bytes, unsigned count) {
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uint64_t hash = UINT64_C(14695981039346656037);
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for (unsigned i = 0; i < count; ++i)
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hash = (hash ^ bytes[i]) * UINT64_C(1099511628211);
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return hash;
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}
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static void source_ram_page_probe(unsigned frame, uint64_t cycle) {
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static int initialized, enabled;
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static FILE *stream;
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static unsigned snapshots[64], snapshot_count, max_frames = 20000;
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if (!initialized) {
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initialized = 1;
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const char *setting = getenv("PSX_SOURCE_RAM_PAGE_PROBE");
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enabled = setting && strcmp(setting, "1") == 0;
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if (enabled) max_frames = source_observer_max_frames("PSX_SOURCE_RAM_MAX_FRAMES");
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const char *cursor = getenv("PSX_SOURCE_RAM_SNAPSHOT_FRAMES");
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while (enabled && cursor && *cursor) {
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if (*cursor < '0' || *cursor > '9') abort();
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char *end;
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unsigned long value = strtoul(cursor, &end, 10);
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if (end == cursor || value < 1 || value > max_frames || snapshot_count == sizeof(snapshots)/sizeof(snapshots[0]) ||
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(*end && *end != ',')) abort();
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for (unsigned i = 0; i < snapshot_count; ++i)
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if (snapshots[i] == value) abort();
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snapshots[snapshot_count++] = (unsigned)value;
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cursor = *end ? end + 1 : end;
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if (*end && !*cursor) abort();
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}
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}
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if (!enabled) return;
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if (frame < 1 || frame > max_frames) abort();
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extern uint8_t *memory_get_ram_ptr(void);
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const uint8_t *ram = memory_get_ram_ptr();
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char path[4096];
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const char *directory = getenv("PSX_INPUT_ROUTE_CAPTURE_DIR");
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if (!ram || !directory) abort();
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if (!stream) {
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if (snprintf(path, sizeof(path), "%s/ram-pages.tsv", directory) >= (int)sizeof(path)) abort();
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stream = fopen(path, "wx");
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if (!stream) abort();
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fputs("# psx-ram-pages-v1 page_bytes=4096 ram_bytes=2097152 hash=fnv1a64\nframe\tcycle", stream);
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for (unsigned page = 0; page < 512; ++page) fprintf(stream, "\t%06X", page * 4096);
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fputc('\n', stream);
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}
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fprintf(stream, "%u\t%llu", frame, (unsigned long long)cycle);
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for (unsigned page = 0; page < 512; ++page)
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fprintf(stream, "\t%016llX", (unsigned long long)source_ram_page_hash(ram + page * 4096, 4096));
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fputc('\n', stream);
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if (fflush(stream) != 0 || ferror(stream)) abort();
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for (unsigned i = 0; i < snapshot_count; ++i) if (snapshots[i] == frame) {
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if (snprintf(path, sizeof(path), "%s/ram-frame-%06u.bin", directory, frame) >= (int)sizeof(path)) abort();
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FILE *snapshot = fopen(path, "wbx");
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if (!snapshot) abort();
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if (fwrite(ram, 1, 2097152, snapshot) != 2097152 || fclose(snapshot) != 0) abort();
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}
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}
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#endif
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