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563e677b08
Add Riscv example. Risc-V CI. Install baremetal toolchain. Prevent imported crt file from messing up linker search.
30 lines
948 B
ArmAsm
30 lines
948 B
ArmAsm
# Simple C runtime startup bootstrap
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# Two primary functions:
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# - Stack allocation and initializing stack pointer
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# - Jumping to main
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.section .text._start
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.global _start
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_start:
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la sp, __stack_top # Load the stack pointer
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add s0, sp, zero # Set the frame pointer
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jal zero, main # Run main entry point - no argc
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loop: j loop # Spin forever in case main returns
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# Support semi-hosting calls
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.option norvc
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.text
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.balign 16
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.global sys_semihost
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.type sys_semihost @function
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sys_semihost: # https://github.com/riscv-non-isa/riscv-semihosting/blob/main/src/binary-interface.adoc
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slli zero, zero, 0x1f
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ebreak
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srai zero, zero, 0x7
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ret
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.section .data
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.space 1024*8 # allocate 8K of memory to serve as initial stack
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.align 16 # Smallest stack allocation is 16 bytes, so align accordingly
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__stack_top: # The stack grows downward according the Risc-V ABI
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