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Make BigBuf take dynamically the available space with a fixed (4K) stack

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This commit is contained in:
slurdge 2020-06-10 12:41:18 +02:00
commit c89fc81fcf
4 changed files with 35 additions and 16 deletions
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38
armsrc/BigBuf.c
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@ -14,34 +14,48 @@
#include "dbprint.h"
#include "pm3_cmd.h"
extern uint8_t _stack_start, __bss_end__;
// BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
// Also used to hold various smaller buffers and the Mifare Emulator Memory.
// declare it as uint32_t to achieve alignment to 4 Byte boundary
static uint32_t BigBuf[BIGBUF_SIZE / sizeof(uint32_t)];
// We know that bss is aligned to 4 bytes.
static uint8_t* BigBuf = &__bss_end__;
/* BigBuf memory layout:
Pointer to highest available memory: BigBuf_hi
high BIGBUF_SIZE
high BigBuf_size
reserved = BigBuf_malloc() subtracts amount from BigBuf_hi,
low 0x00
*/
static uint32_t BigBuf_size = 0;
// High memory mark
static uint16_t BigBuf_hi = BIGBUF_SIZE;
static uint32_t BigBuf_hi = 0;
// pointer to the emulator memory.
static uint8_t *emulator_memory = NULL;
// trace related variables
static uint32_t traceLen = 0;
static bool tracing = true; //todo static?
static bool tracing = true;
// compute the available size for BigBuf
void BigBuf_initialize(void) {
BigBuf_size = (uint32_t)&_stack_start - (uint32_t)&__bss_end__;
BigBuf_hi = BigBuf_size;
traceLen = 0;
}
// get the address of BigBuf
uint8_t *BigBuf_get_addr(void) {
return (uint8_t *)BigBuf;
}
uint32_t BigBuf_get_size(void) {
return BigBuf_size;
}
// get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
uint8_t *BigBuf_get_EM_addr(void) {
// not yet allocated
@ -58,9 +72,9 @@ void BigBuf_Clear(void) {
// clear ALL of BigBuf
void BigBuf_Clear_ext(bool verbose) {
memset(BigBuf, 0, BIGBUF_SIZE);
memset(BigBuf, 0, BigBuf_size);
if (verbose)
Dbprintf("Buffer cleared (%i bytes)", BIGBUF_SIZE);
Dbprintf("Buffer cleared (%i bytes)", BigBuf_size);
}
void BigBuf_Clear_EM(void) {
@ -74,7 +88,7 @@ void BigBuf_Clear_keep_EM(void) {
// allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
// at the beginning of BigBuf is always for traces/samples
uint8_t *BigBuf_malloc(uint16_t chunksize) {
if (BigBuf_hi - chunksize < 0)
if (BigBuf_hi < chunksize)
return NULL; // no memory left
chunksize = (chunksize + 3) & 0xfffc; // round to next multiple of 4
@ -84,7 +98,7 @@ uint8_t *BigBuf_malloc(uint16_t chunksize) {
// free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
void BigBuf_free(void) {
BigBuf_hi = BIGBUF_SIZE;
BigBuf_hi = BigBuf_size;
emulator_memory = NULL;
// shouldn't this empty BigBuf also?
}
@ -94,14 +108,14 @@ void BigBuf_free_keep_EM(void) {
if (emulator_memory != NULL)
BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
else
BigBuf_hi = BIGBUF_SIZE;
BigBuf_hi = BigBuf_size;
// shouldn't this empty BigBuf also?
}
void BigBuf_print_status(void) {
DbpString(_BLUE_("Memory"));
Dbprintf(" BIGBUF_SIZE.............%d", BIGBUF_SIZE);
Dbprintf(" BigBuf_size.............%d", BigBuf_size);
Dbprintf(" Available memory........%d", BigBuf_hi);
DbpString(_BLUE_("Tracing"));
Dbprintf(" tracing ................%d", tracing);