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crt0 now uses stack configuration from linker script

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stnolting 2020-09-14 22:03:58 +02:00
parent cd848850d8
commit 3ecc240a62
1 changed files with 14 additions and 17 deletions
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31
sw/common/crt0.S
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@ -41,10 +41,6 @@
// IO region
.equ IO_BEGIN, 0xFFFFFF80 // start of processor-internal IO region
// SYSINFO
.equ SYSINFO_DSPACE_BASE, 0xFFFFFFF4
.equ SYSINFO_DSPACE_SIZE, 0xFFFFFFFC
_start:
.cfi_startproc
@ -68,29 +64,30 @@ __crt0_reg_file_clear:
//addi x10, x0, 0
//addi x11, x0, 0
//addi x12, x0, 0
addi x13, x0, 0
//addi x13, x0, 0
addi x14, x0, 0
addi x15, x0, 0
// *********************************************************
// Setup stack pointer
// No interrupts, thanks
// *********************************************************
__crt0_stack_pointer_init:
lw x11, SYSINFO_DSPACE_BASE(zero) // data memory space base address
lw x12, SYSINFO_DSPACE_SIZE(zero) // data memory space size
add sp, x11, x12
addi sp, sp, -4 // stack pointer = last entry
addi fp, sp, 0 // frame pointer = stack pointer
__crt0_status_init:
li x10, 0x00001800 // clear mstatus and set mpp(1:0)
csrrw zero, mstatus, x10
csrrw zero, mie, zero // clear mie
// *********************************************************
// Setup global pointer
// Setup pointers using linker script symbol
// *********************************************************
__crt0_global_pointer_init:
__crt0_pointer_init:
.option push
.option norelax
la gp, __global_pointer$
la sp, __crt0_stack_begin
andi sp, sp, 0xfffffffc // make sure this is aligned
addi fp, sp, 0 // frame pointer = stack pointer
la gp, __global_pointer$ // global pointer
.option pop
@ -117,7 +114,7 @@ __crt0_reset_io_loop:
// *********************************************************
// Clear .bss section (byte-wise)
// Clear .bss section (byte-wise) using linker script symbols
// *********************************************************
__crt0_clear_bss:
la x11, __crt0_bss_start
@ -133,7 +130,7 @@ __crt0_clear_bss_loop_end:
// *********************************************************
// Copy initialized .data section from ROM to RAM (byte-wise)
// Copy initialized .data section from ROM to RAM (byte-wise) using linker script symbols
// *********************************************************
__crt0_copy_data:
la x11, __crt0_copy_data_src_begin // start of data area (copy source)