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lessen stack usage

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This commit is contained in:
iceman1001
2026-09-01 06:40:07 +02:00
parent f1cc02a6ca
commit 70b2262326
1 changed files with 26 additions and 5 deletions
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armsrc/Standalone/hf_emvpng.c
+26 -5
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@@ -218,7 +218,10 @@ void RunMod(void) {
// UID 4 bytes(could be 7 bytes if needed it)
uint8_t flags = FLAG_4B_UID_IN_DATA;
// in case there is a read command received we shouldn't break
uint8_t data[PM3_CMD_DATA_SIZE] = {0x00};
// only the UID is ever read out of this by SimulateIso14443aInit(), at most
// 10 bytes for a triple-cascade UID. It used to be PM3_CMD_DATA_SIZE, which
// put 624 bytes on the stack for nothing.
uint8_t data[10] = {0x00};
uint8_t visauid[7] = {0x01, 0x02, 0x03, 0x04};
memcpy(data, visauid, 4);
@@ -233,17 +236,21 @@ void RunMod(void) {
uint8_t receivedCmd[MAX_FRAME_SIZE] = { 0x00 };
uint8_t receivedCmdPar[MAX_PARITY_SIZE] = { 0x00 };
uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE] = {0};
uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE] = {0};
// These live in BigBuf, not on the stack - together they are 1088 bytes on top
// of an already deep RunMod() frame. Same pattern as SimulateIso14443aTagEx()
// in iso14443a.c. Filled in after the emulator is initialized, because
// SimulateIso14443aInit() allocates from BigBuf too.
uint8_t *dynamic_response_buffer = NULL;
uint8_t *dynamic_modulation_buffer = NULL;
// to know the transaction status
uint8_t prevCmd = 0;
// handler - command responses
tag_response_info_t dynamic_response_info = {
.response = dynamic_response_buffer,
.response = NULL,
.response_n = 0,
.modulation = dynamic_modulation_buffer,
.modulation = NULL,
.modulation_n = 0
};
@@ -392,6 +399,20 @@ void RunMod(void) {
continue;
}
dynamic_response_buffer = BigBuf_calloc(DYNAMIC_RESPONSE_BUFFER_SIZE);
dynamic_modulation_buffer = BigBuf_calloc(DYNAMIC_MODULATION_BUFFER_SIZE);
if (dynamic_response_buffer == NULL || dynamic_modulation_buffer == NULL) {
BigBuf_free_keep_EM();
reply_ng(CMD_HF_MIFARE_SIMULATE, PM3_EMALLOC, NULL, 0);
DbpString(_YELLOW_("!!") "Cannot allocate the response buffers!");
SpinDelay(500);
state = STATE_READ;
DbpString(_YELLOW_("[ ") "Initialized reading mode" _YELLOW_(" ]"));
continue;
}
dynamic_response_info.response = dynamic_response_buffer;
dynamic_response_info.modulation = dynamic_modulation_buffer;
// We need to listen to the high-frequency, peak-detected path.
iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);