diff options
| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2022-05-06 14:14:33 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2022-05-06 15:49:51 +0200 |
| commit | d205222eb6a8e5e70c21200beb81c6e19ec211d6 (patch) | |
| tree | 25cfdb2e1880989c42c16de222e05298949be3b2 /arch/x86/entry | |
| parent | x86/mm: Simplify RESERVE_BRK() (diff) | |
| download | linux-dev-d205222eb6a8e5e70c21200beb81c6e19ec211d6.tar.xz linux-dev-d205222eb6a8e5e70c21200beb81c6e19ec211d6.zip | |
x86/entry: Simplify entry_INT80_compat()
Instead of playing silly games with rdi, use rax for simpler and more
consistent code.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220506121631.221072885@infradead.org
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/entry_64_compat.S | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index c5aeb0819707..d743eaa19d9b 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -362,26 +362,25 @@ SYM_CODE_START(entry_INT80_compat) /* switch to thread stack expects orig_ax and rdi to be pushed */ pushq %rax /* pt_regs->orig_ax */ - pushq %rdi /* pt_regs->di */ /* Need to switch before accessing the thread stack. */ - SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi + SWITCH_TO_KERNEL_CR3 scratch_reg=%rax /* In the Xen PV case we already run on the thread stack. */ ALTERNATIVE "", "jmp .Lint80_keep_stack", X86_FEATURE_XENPV - movq %rsp, %rdi + movq %rsp, %rax movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp - pushq 6*8(%rdi) /* regs->ss */ - pushq 5*8(%rdi) /* regs->rsp */ - pushq 4*8(%rdi) /* regs->eflags */ - pushq 3*8(%rdi) /* regs->cs */ - pushq 2*8(%rdi) /* regs->ip */ - pushq 1*8(%rdi) /* regs->orig_ax */ - pushq (%rdi) /* pt_regs->di */ + pushq 5*8(%rax) /* regs->ss */ + pushq 4*8(%rax) /* regs->rsp */ + pushq 3*8(%rax) /* regs->eflags */ + pushq 2*8(%rax) /* regs->cs */ + pushq 1*8(%rax) /* regs->ip */ + pushq 0*8(%rax) /* regs->orig_ax */ .Lint80_keep_stack: + pushq %rdi /* pt_regs->di */ pushq %rsi /* pt_regs->si */ xorl %esi, %esi /* nospec si */ pushq %rdx /* pt_regs->dx */ |