github-mirrors/neorv32
1
0
Fork 0
mirror of https://github.com/stnolting/neorv32.git synced 2025-04-23 13:47:33 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

crt0 now clears ALL registers if not using E extension

Browse source
This commit is contained in:
stnolting 2020-10-12 11:30:22 +02:00
parent 2e4894933c
commit 5fd59c83fa
1 changed files with 40 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

58
sw/common/crt0.S
View file

@ -47,26 +47,48 @@ _start:
.cfi_undefined ra
// *********************************************************
// Clear register file
// Assume 'worst case': rv32e
// Clear register file (lower half, assume E extension)
// *********************************************************
__crt0_reg_file_clear:
//addi x0, x0, 0 // hardwired to zero
addi x1, x0, 0
addi x2, x0, 0
addi x3, x0, 0
addi x4, x0, 0
addi x5, x0, 0
addi x6, x0, 0
addi x7, x0, 0
addi x8, x0, 0
addi x9, x0, 0
//addi x10, x0, 0
//addi x11, x0, 0
//addi x12, x0, 0
//addi x13, x0, 0
addi x14, x0, 0
addi x15, x0, 0
//addi x0, x0, 0 // hardwired to zero
addi x1, x0, 0
addi x2, x0, 0
addi x3, x0, 0
addi x4, x0, 0
addi x5, x0, 0
addi x6, x0, 0
addi x7, x0, 0
addi x8, x0, 0
addi x9, x0, 0
//addi x10, x0, 0
//addi x11, x0, 0
//addi x12, x0, 0
//addi x13, x0, 0
addi x14, x0, 0
addi x15, x0, 0
// *********************************************************
// Clear register file (upper half, if no E extension)
// *********************************************************
#ifndef __riscv_32e
addi x16, x0, 0
addi x17, x0, 0
addi x18, x0, 0
addi x19, x0, 0
addi x20, x0, 0
addi x21, x0, 0
addi x22, x0, 0
addi x23, x0, 0
addi x24, x0, 0
addi x25, x0, 0
addi x26, x0, 0
addi x27, x0, 0
addi x28, x0, 0
addi x29, x0, 0
addi x30, x0, 0
addi x31, x0, 0
#endif
// *********************************************************