Hi, below are some small comments.
On Tue, Jul 04, 2017 at 12:50:54PM -0700, Palmer Dabbelt wrote:
> This contains the various __init C functions, the initial assembly
> kernel entry point, and the code to reset the system. When a file was
> init-related, it contains
It contains what?
> Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxx>
[...]
> +#ifdef CONFIG_GENERIC_BUG
> +#define __BUG_INSN _AC(0x00100073, UL) /* sbreak */
This should be ebreak, not sbreak, in Priv Spec 1.10, AFAICT.
I guess binutils still understands sbreak, but it's nicer to stick to
the spec, IMHO.
> +#define BUG() \
> +do { \
> + __asm__ __volatile__ ( \
> + "1:\n\t" \
> + "sbreak\n" \
ebreak
> + ".pushsection __bug_table,\"a\"\n\t" \
> + "2:\n\t" \
> + __BUG_ENTRY "\n\t" \
> + ".org 2b + %2\n\t" \
> + ".popsection" \
> + : \
> + : "i" (__FILE__), "i" (__LINE__), \
> + "i" (sizeof(struct bug_entry))); \
> + unreachable(); \
> +} while (0)
> +#endif /* !__ASSEMBLY__ */
> +#else /* CONFIG_GENERIC_BUG */
> +#ifndef __ASSEMBLY__
> +#define BUG() \
> +do { \
> + __asm__ __volatile__ ("sbreak\n"); \
ebreak
> + unreachable(); \
> +} while (0)
> +#endif /* !__ASSEMBLY__ */
> +#endif /* CONFIG_GENERIC_BUG */
[...]
> +#define DO_ERROR_INFO(name, signo, code, str) \
> +asmlinkage void name(struct pt_regs *regs) \
> +{ \
> + do_trap_error(regs, signo, code, regs->sepc, "Oops - " str); \
> +}
> +
> +DO_ERROR_INFO(do_trap_unknown,
> + SIGILL, ILL_ILLTRP, "unknown exception");
> +DO_ERROR_INFO(do_trap_insn_misaligned,
> + SIGBUS, BUS_ADRALN, "instruction address misaligned");
> +DO_ERROR_INFO(do_trap_insn_fault,
> + SIGBUS, BUS_ADRALN, "instruction access fault");
For a general instruction access fault, BUS_ADRALN seems wrong. A
variant of SIGSEGV seems more appropriate, IMHO.
Jonathan Neuschäfer
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