Messages in this thread | | | Date | Thu, 12 Jan 2023 12:22:10 -0800 | Subject | Re: [PATCH] riscv: elf: add .riscv.attributes parsing | From | Vineet Gupta <> |
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On 1/11/23 08:53, Eric W. Biederman wrote: > Vineet Gupta <vineetg@rivosinc.com> writes: > >> This implements the elf loader hook to parse RV specific >> .riscv.attributes section. This section is inserted by compilers >> (gcc/llvm) with build related information such as -march organized as >> tag/value attribute pairs. >> >> It identifies the various attribute tags (and corresponding values) as >> currently specified in the psABI specification. >> >> This patch only implements the elf parsing mechanics, leaving out the >> recording/usage of the attributes to subsequent patches. > Why does the kernel care? > > Unless I am mistaken the kind of information you are describing is > typically dealt with by the dynamic linker, rather than the kernel. > > As a general strategy I think it is smart to leave as much to > userspace and the dynamic linker and possible intead of asking > the kernel's elf loader to care.
That is true in general. But in some cases we might have to do stuff before kick starting usermode such as setting up a shadow stack with special permissions etc.
> That allows more rapid > prototyping and reduces the impact of parsing bugs.
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