Messages in this thread | | | Subject | Re: [PATCH] riscv: entry: Save a0 prior syscall_enter_from_user_mode() | Date | Tue, 11 Apr 2023 10:39:11 -0700 | From | Palmer Dabbelt <> |
| |
On Mon, 03 Apr 2023 08:52:07 +0200, Björn Töpel wrote: > The RISC-V calling convention passes the first argument, and the > return value in the a0 register. For this reason, the a0 register > needs some extra care; When handling syscalls, the a0 register is > saved into regs->orig_a0, so a0 can be properly restored for, > e.g. interrupted syscalls. > > This functionality was broken with the introduction of the generic > entry patches. Here, a0 was saved into orig_a0 after calling > syscall_enter_from_user_mode(), which can change regs->a0 for some > paths, incorrectly restoring a0. > > [...]
Applied, thanks!
[1/1] riscv: entry: Save a0 prior syscall_enter_from_user_mode() https://git.kernel.org/palmer/c/9c2598d43510
Best regards, -- Palmer Dabbelt <palmer@rivosinc.com>
| |