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[sw\crt0.S] crt0 now resets CPU's cycle and instruction counters

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stnolting 2020-12-03 20:41:52 +01:00
parent 3691df734c
commit 5e2d417176
1 changed files with 13 additions and 4 deletions
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17
sw/common/crt0.S
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@ -104,7 +104,7 @@ __crt0_status_init:
// *********************************************************
// Setup pointers using linker script symbol
// Setup pointers using linker script symbols
// *********************************************************
__crt0_pointer_init:
.option push
@ -117,7 +117,7 @@ __crt0_pointer_init:
// *********************************************************
// Init trap handler base address
// Initialize dummy trap handler base address
// *********************************************************
__crt0_neorv32_trap_init:
la x11, __crt0_dummy_trap_handler
@ -174,13 +174,20 @@ __crt0_copy_data_loop_end:
// *********************************************************
// Call main function (with argc = argv = 0)
// Call main function
// *********************************************************
__crt0_main_entry:
// setup arguments for calling main
addi x10, zero, 0 // argc = 0
addi x11, zero, 0 // argv = 0
// clear cycle and instruction counters
csrw mcycle, zero
csrw mcycleh, zero
csrw minstret, zero
csrw minstreth, zero
jal ra, main
@ -189,8 +196,10 @@ __crt0_main_entry:
// *********************************************************
__crt0_this_is_the_end:
csrrci zero, mstatus, 8 // mstatus: disable global IRQs (MIE)
nop
wfi
j . // in case WFI is not available
__crt0_this_is_the_end_my_friend:
j __crt0_this_is_the_end_my_friend // in case WFI is not available
// *********************************************************