diff options
| author | Andy Lutomirski <luto@kernel.org> | 2018-09-03 15:59:42 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-09-08 11:20:11 +0200 |
| commit | bd7b1f7cbf9cb35dab8e1b99145d07afc5b7a132 (patch) | |
| tree | 684b0f84d64a49498a6b0f01d3771f0c4117833a /arch/x86/kernel/traps.c | |
| parent | db44bf4b4768a0664d3c9d9000ecb747de31ded8 (diff) | |
x86/entry/64: Document idtentry
The idtentry macro is complicated and magical. Document what it
does to help future readers and to allow future patches to adjust
the code and docs at the same time.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/6e56c3ad94879e41afe345750bc28ccc0e820ea8.1536015544.git.luto@kernel.org
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index e6db475164ed..1a90821c0b74 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -383,6 +383,10 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code) * we won't enable interupts or schedule before we invoke * general_protection, so nothing will clobber the stack * frame we just set up. + * + * We will enter general_protection with kernel GSBASE, + * which is what the stub expects, given that the faulting + * RIP will be the IRET instruction. */ regs->ip = (unsigned long)general_protection; regs->sp = (unsigned long)&gpregs->orig_ax; |