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Add option to automatically set a watchpoint at the end of the swapped-in task

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This commit is contained in:
Jeroen Domburg
2017-01-09 16:42:45 +08:00
parent 633cd49f88
commit ca57a86f20
4 changed files with 81 additions and 0 deletions
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48
components/esp32/panic.c
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@@ -32,6 +32,7 @@
#include "esp_gdbstub.h"
#include "esp_panic.h"
#include "esp_attr.h"
#include "esp_err.h"
/*
Panic handlers; these get called when an unhandled exception occurs or the assembly-level
@@ -353,3 +354,50 @@ void esp_set_breakpoint_if_jtag(void *fn)
setFirstBreakpoint((uint32_t)fn);
}
}
esp_err_t esp_set_watchpoint(int no, void *adr, int size, int flags)
{
int x;
if (no<0 || no>1) return ESP_ERR_INVALID_ARG;
if (flags&(~0xC0000000)) return ESP_ERR_INVALID_ARG;
int dbreakc=0x3F;
//We support watching 2^n byte values, from 1 to 64. Calculate the mask for that.
for (x=0; x<6; x++) {
if (size==(1<<x)) break;
dbreakc<<=1;
}
if (x==6) return ESP_ERR_INVALID_ARG;
//Mask mask and add in flags.
dbreakc=(dbreakc&0x3f)|flags;
if (no==0) {
asm volatile(
"wsr.dbreaka0 %0\n" \
"wsr.dbreakc0 %1\n" \
::"r"(adr),"r"(dbreakc));
} else {
asm volatile(
"wsr.dbreaka1 %0\n" \
"wsr.dbreakc1 %1\n" \
::"r"(adr),"r"(dbreakc));
}
return ESP_OK;
}
void esp_clear_watchpoint(int no)
{
//Setting a dbreakc register to 0 makes it trigger on neither load nor store, effectively disabling it.
int dbreakc=0;
if (no==0) {
asm volatile(
"wsr.dbreakc0 %0\n" \
::"r"(dbreakc));
} else {
asm volatile(
"wsr.dbreakc1 %0\n" \
::"r"(dbreakc));
}
}