summaryrefslogtreecommitdiff
path: root/arch/x86/xen
diff options
context:
space:
mode:
authorThomas Gleixner <tglx@linutronix.de>2023-12-04 11:31:39 +0300
committerDave Hansen <dave.hansen@linux.intel.com>2023-12-07 20:51:29 +0300
commitbe5341eb0d43b1e754799498bd2e8756cc167a41 (patch)
treec43b402710a38cd0a16cf3706145ce06182f424e /arch/x86/xen
parentb82a8dbd3d2f4563156f7150c6f2ecab6e960b30 (diff)
downloadlinux-be5341eb0d43b1e754799498bd2e8756cc167a41.tar.xz
x86/entry: Convert INT 0x80 emulation to IDTENTRY
There is no real reason to have a separate ASM entry point implementation for the legacy INT 0x80 syscall emulation on 64-bit. IDTENTRY provides all the functionality needed with the only difference that it does not: - save the syscall number (AX) into pt_regs::orig_ax - set pt_regs::ax to -ENOSYS Both can be done safely in the C code of an IDTENTRY before invoking any of the syscall related functions which depend on this convention. Aside of ASM code reduction this prepares for detecting and handling a local APIC injected vector 0x80. [ kirill.shutemov: More verbose comments ] Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de> Cc: <stable@vger.kernel.org> # v6.0+
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/enlighten_pv.c2
-rw-r--r--arch/x86/xen/xen-asm.S2
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index bbbfdd495ebd..aeb33e0a3f76 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -704,7 +704,7 @@ static struct trap_array_entry trap_array[] = {
TRAP_ENTRY(exc_int3, false ),
TRAP_ENTRY(exc_overflow, false ),
#ifdef CONFIG_IA32_EMULATION
- { entry_INT80_compat, xen_entry_INT80_compat, false },
+ TRAP_ENTRY(int80_emulation, false ),
#endif
TRAP_ENTRY(exc_page_fault, false ),
TRAP_ENTRY(exc_divide_error, false ),
diff --git a/arch/x86/xen/xen-asm.S b/arch/x86/xen/xen-asm.S
index 9e5e68008785..1a9cd18dfbd3 100644
--- a/arch/x86/xen/xen-asm.S
+++ b/arch/x86/xen/xen-asm.S
@@ -156,7 +156,7 @@ xen_pv_trap asm_xenpv_exc_machine_check
#endif /* CONFIG_X86_MCE */
xen_pv_trap asm_exc_simd_coprocessor_error
#ifdef CONFIG_IA32_EMULATION
-xen_pv_trap entry_INT80_compat
+xen_pv_trap asm_int80_emulation
#endif
xen_pv_trap asm_exc_xen_unknown_trap
xen_pv_trap asm_exc_xen_hypervisor_callback