esp-idf/components/esp_gdbstub/xtensa/gdbstub-entry.S

45 wiersze
1.4 KiB
ArmAsm

#include "freertos/xtensa_rtos.h"
// ------------------------------------------------
.section .iram1,"ax"
.global gdbstub_handle_uart_int
.global _xt_gdbstub_int
.align 4
_xt_gdbstub_int:
/* Allocate exception frame and save minimal context. */
mov a0, sp
addi sp, sp, -XT_STK_FRMSZ
s32i a0, sp, XT_STK_A1
#if XCHAL_HAVE_WINDOWED
s32e a0, sp, -12 /* for debug backtrace */
#endif
rsr a0, PS /* save interruptee's PS */
s32i a0, sp, XT_STK_PS
rsr a0, EPC_1 /* save interruptee's PC */
s32i a0, sp, XT_STK_PC
#if XCHAL_HAVE_WINDOWED
s32e a0, sp, -16 /* for debug backtrace */
#endif
s32i a12, sp, XT_STK_A12 /* _xt_context_save requires A12- */
s32i a13, sp, XT_STK_A13 /* A13 to have already been saved */
/* Save exc cause and vaddr into exception frame */
rsr a0, EXCCAUSE
s32i a0, sp, XT_STK_EXCCAUSE
rsr a0, EXCVADDR
s32i a0, sp, XT_STK_EXCVADDR
/* _xt_context_save seems to save the current a0, but we need the interuptees a0. Fix this. */
rsr a0, EXCSAVE_1 /* save interruptee's a0 */
s32i a0, sp, XT_STK_A0
mov a6,sp
movi a3, gdbstub_handle_uart_int
callx0 a3
ret