lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 23 Jun 2015 19:46:14 -0700 From: Andy Lutomirski <luto@...nel.org> To: x86@...nel.org, linux-kernel@...r.kernel.org Cc: Frédéric Weisbecker <fweisbec@...il.com>, Rik van Riel <riel@...hat.com>, Oleg Nesterov <oleg@...hat.com>, Denys Vlasenko <vda.linux@...glemail.com>, Borislav Petkov <bp@...en8.de>, Kees Cook <keescook@...omium.org>, Brian Gerst <brgerst@...il.com>, paulmck@...ux.vnet.ibm.com, Andy Lutomirski <luto@...nel.org> Subject: [PATCH v3 11/15] x86/asm/entry/64: Simplify irq stack pt_regs handling There's no need for both rsi and rdi to point to the original stack. Signed-off-by: Andy Lutomirski <luto@...nel.org> --- arch/x86/entry/entry_64.S | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 3fdfd3e27918..ce2d10933c11 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -505,8 +505,6 @@ END(irq_entries_start) SAVE_C_REGS SAVE_EXTRA_REGS - movq %rsp,%rdi /* arg1 for \func (pointer to pt_regs) */ - testb $3, CS(%rsp) jz 1f SWAPGS @@ -518,14 +516,14 @@ END(irq_entries_start) * a little cheaper to use a separate counter in the PDA (short of * moving irq_enter into assembly, which would be too much work) */ - movq %rsp, %rsi + movq %rsp, %rdi incl PER_CPU_VAR(irq_count) cmovzq PER_CPU_VAR(irq_stack_ptr), %rsp - pushq %rsi + pushq %rdi /* We entered an interrupt context - irqs are off: */ TRACE_IRQS_OFF - call \func + call \func /* rdi points to pt_regs */ .endm /* -- 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/
Powered by blists - more mailing lists