Where is the entry point to ISR Linux

Question

I am trying to understand the system call interface and implementation in the Linux kernel. I know about entry.S and the relationship between libc headers and implementation. What I want to know is where in the kernel is the int 80h received for the first time, that is, the place that decides that it is actually an 80h interrupt. Can someone please give me an LXR link for this, please?

Answer 1

CONFIG_X86_32

• arch / x86 / kernel / entry_32.S: system_call (INT $ 0x80)
• arch / x86 / kernel / entry_32.S: ia32_sysenter_target (SYSENTER)

CONFIG_X86_64

• arch / x86 / kernel / entry_64.S: system_call (SYSCALL, 64 bit)

CONFIG_X86_64 and CONFIG_IA32_EMULATION

• arch / x86 / ia32 / ia32entry.S: ia32_sysenter_target (SYSENTER)
• arch / x86 / ia32 / ia32entry.S: ia32_cstar_target (SYSCALL, 32bit)
• arch / x86 / ia32 / ia32entry.S: ia32_syscall (INT $ 0x80)