Date: Wed, 28 Oct 2020 12:48:02 +1100 From: Patrick Oppenlander <patrick.oppenlander@...il.com> To: musl@...ts.openwall.com Cc: unicorn_wang <unicorn_wang@...look.com> Subject: Re: [Question] about arch/riscv64/crt_arch.h On Wed, Oct 28, 2020 at 12:40 PM Chen Wang <unicorn_wang@...look.com> wrote: > > hi, > I'm reading musl (1.2.1) code for riscv. In arch/riscv64/crt_arch.h, > > __asm__( > ...... > "andi sp, sp, -16\n\t" // <--- why do we need this? > "tail " START "_c" > ); > I'm not familiar with RISC-V, but it's there to guarantee that the stack is 16-byte aligned which must be either an architectural or ABI requirement. Perhaps the kernel can start the process with a more relaxed stack alignment. Otherwise it's there for safety (paranoia). Patrick
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