| Line 102... |
Line 102... |
csrrw zero, mstatus, x10
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csrrw zero, mstatus, x10
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csrrw zero, mie, zero // clear mie
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csrrw zero, mie, zero // clear mie
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// *********************************************************
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// *********************************************************
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// Setup pointers using linker script symbol
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// Setup pointers using linker script symbols
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// *********************************************************
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// *********************************************************
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__crt0_pointer_init:
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__crt0_pointer_init:
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.option push
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.option push
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.option norelax
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.option norelax
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la sp, __crt0_stack_begin
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la sp, __crt0_stack_begin
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| Line 115... |
Line 115... |
la gp, __global_pointer$ // global pointer
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la gp, __global_pointer$ // global pointer
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.option pop
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.option pop
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|
|
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// *********************************************************
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// *********************************************************
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// Init trap handler base address
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// Initialize dummy trap handler base address
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// *********************************************************
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// *********************************************************
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__crt0_neorv32_trap_init:
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__crt0_neorv32_trap_init:
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la x11, __crt0_dummy_trap_handler
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la x11, __crt0_dummy_trap_handler
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csrw mtvec, x11 // set address of first-level exception handler
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csrw mtvec, x11 // set address of first-level exception handler
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| Line 172... |
Line 172... |
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__crt0_copy_data_loop_end:
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__crt0_copy_data_loop_end:
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// *********************************************************
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// *********************************************************
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// Call main function (with argc = argv = 0)
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// Call main function
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// *********************************************************
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// *********************************************************
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__crt0_main_entry:
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__crt0_main_entry:
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|
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// setup arguments for calling main
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addi x10, zero, 0 // argc = 0
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addi x10, zero, 0 // argc = 0
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addi x11, zero, 0 // argv = 0
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addi x11, zero, 0 // argv = 0
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// clear cycle and instruction counters
|
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csrw mcycle, zero
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csrw mcycleh, zero
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csrw minstret, zero
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csrw minstreth, zero
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|
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jal ra, main
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jal ra, main
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|
|
|
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// *********************************************************
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// *********************************************************
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// Go to endless sleep mode if main returns
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// Go to endless sleep mode if main returns
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// *********************************************************
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// *********************************************************
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__crt0_this_is_the_end:
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__crt0_this_is_the_end:
|
csrrci zero, mstatus, 8 // mstatus: disable global IRQs (MIE)
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csrrci zero, mstatus, 8 // mstatus: disable global IRQs (MIE)
|
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nop
|
wfi
|
wfi
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j . // in case WFI is not available
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__crt0_this_is_the_end_my_friend:
|
|
j __crt0_this_is_the_end_my_friend // in case WFI is not available
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// *********************************************************
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// *********************************************************
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// dummy trap handler (for exceptions & IRQs)
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// dummy trap handler (for exceptions & IRQs)
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// tries to move on to next instruction
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// tries to move on to next instruction
|
