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Message-Id: <a77ed179834c27da436fb4a7fb23c8ee77abc11c.1444091585.git.luto@kernel.org> Date: Mon, 5 Oct 2015 17:48:08 -0700 From: Andy Lutomirski <luto@...nel.org> To: x86@...nel.org, linux-kernel@...r.kernel.org Cc: Brian Gerst <brgerst@...il.com>, Denys Vlasenko <dvlasenk@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org> Subject: [PATCH v2 20/36] x86/entry: Add do_syscall_32, a C function to do 32-bit syscalls System calls are really quite simple. Add a helper to call a 32-bit system call. Signed-off-by: Andy Lutomirski <luto@...nel.org> --- arch/x86/entry/common.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index d94a60c16029..41d17508cf46 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -318,3 +318,46 @@ __visible void syscall_return_slowpath(struct pt_regs *regs) local_irq_disable(); prepare_exit_to_usermode(regs); } + +#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) +/* + * Does a 32-bit syscall. Called with IRQs off and does all entry and + * exit work. + */ +__visible void do_int80_syscall_32(struct pt_regs *regs) +{ + struct thread_info *ti = pt_regs_to_thread_info(regs); + unsigned int nr = (unsigned int)regs->orig_ax; + +#ifdef CONFIG_IA32_EMULATION + ti->status |= TS_COMPAT; +#endif + + local_irq_enable(); + + if (READ_ONCE(ti->flags) & _TIF_WORK_SYSCALL_ENTRY) { + /* + * Subtlety here: if ptrace pokes something larger than + * 2^32-1 into orig_ax, this truncates it. This may or + * may not be necessary, but it matches the old asm + * behavior. + */ + nr = syscall_trace_enter(regs); + } + + if (nr < IA32_NR_syscalls) { + /* + * It's possible that a 32-bit syscall implementation + * takes a 64-bit parameter but nonetheless assumes that + * the high bits are zero. Make sure we zero-extend all + * of the args. + */ + regs->ax = ia32_sys_call_table[nr]( + (unsigned int)regs->bx, (unsigned int)regs->cx, + (unsigned int)regs->dx, (unsigned int)regs->si, + (unsigned int)regs->di, (unsigned int)regs->bp); + } + + syscall_return_slowpath(regs); +} +#endif -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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