On Fri, Jun 20, 2025 at 08:50:51AM -0700, Jesse Taube wrote:
When exiting it may be useful for the sbi implementation to know the exit code. Add exit code to sbi_shutdown, and use it in exit().
Signed-off-by: Jesse Taube jesse@rivosinc.com
lib/riscv/asm/sbi.h | 2 +- lib/riscv/io.c | 2 +- lib/riscv/sbi.c | 4 ++-- 3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/lib/riscv/asm/sbi.h b/lib/riscv/asm/sbi.h index a5738a5c..de11c109 100644 --- a/lib/riscv/asm/sbi.h +++ b/lib/riscv/asm/sbi.h @@ -250,7 +250,7 @@ struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0, unsigned long arg3, unsigned long arg4, unsigned long arg5); -void sbi_shutdown(void); +void sbi_shutdown(unsigned int code); struct sbiret sbi_hart_start(unsigned long hartid, unsigned long entry, unsigned long sp); struct sbiret sbi_hart_stop(void); struct sbiret sbi_hart_get_status(unsigned long hartid); diff --git a/lib/riscv/io.c b/lib/riscv/io.c index fb40adb7..02231268 100644 --- a/lib/riscv/io.c +++ b/lib/riscv/io.c @@ -150,7 +150,7 @@ void halt(int code); void exit(int code) { printf("\nEXIT: STATUS=%d\n", ((code) << 1) | 1);
- sbi_shutdown();
- sbi_shutdown(code & 1); halt(code); __builtin_unreachable();
} diff --git a/lib/riscv/sbi.c b/lib/riscv/sbi.c index 2959378f..9dd11e9d 100644 --- a/lib/riscv/sbi.c +++ b/lib/riscv/sbi.c @@ -107,9 +107,9 @@ struct sbiret sbi_sse_inject(unsigned long event_id, unsigned long hart_id) return sbi_ecall(SBI_EXT_SSE, SBI_EXT_SSE_INJECT, event_id, hart_id, 0, 0, 0, 0); } -void sbi_shutdown(void) +void sbi_shutdown(unsigned int code) {
- sbi_ecall(SBI_EXT_SRST, 0, 0, 0, 0, 0, 0, 0);
- sbi_ecall(SBI_EXT_SRST, 0, 0, code, 0, 0, 0, 0);
We can't do this because a kvm-unit-tests exit code is not an SRST::reset_reason[1]. This could result in the SBI implementation returning an error, or doing something else, rather than shutting down.
If this is a custom kvm-unit-tests-specific SBI implementation, then we could pass in a reset_reason in the 0xE0000000 - 0xEFFFFFFF range.
[1] https://github.com/riscv-non-isa/riscv-sbi-doc/blob/master/src/ext-sys-reset...
Thanks, drew
puts("SBI shutdown failed!\n"); } -- 2.43.0
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