This regeset is intended to be used to get and set a system call number while tracing. There was some discussion about possible approaches to do so: (1) modify x8 register with ptrace(PTRACE_SETREGSET) indirectly, and update regs->syscallno later on in syscall_trace_enter(), or (2) define a dedicated regset for this purpose as on s390, or (3) support ptrace(PTRACE_SET_SYSCALL) as on arch/arm Thinking of the fact that user_pt_regs doesn't expose 'syscallno' to tracer as well as that secure_computing() expects a changed syscall number, especially case of -1, to be visible before this function returns in syscall_trace_enter(), (1) doesn't work well. We will take (2) since it looks much cleaner.
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| @@ -397,6 +397,7 @@ typedef struct elf64_shdr { · 396 unmodified lines | |||
| 397 | #define NT_ARM_TLS 0x401 /* ARM TLS register */ | 397 | #define NT_ARM_TLS 0x401 /* ARM TLS register */ |
| 398 | #define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */ | 398 | #define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */ |
| 399 | #define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */ | 399 | #define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */ |
| 400 | #define NT_ARM_SYSTEM_CALL 0x404 /* ARM system call number */ | ||
| 400 | #define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */ | 401 | #define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */ |
| 401 | #define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */ | 402 | #define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */ |
| 402 | #define NT_METAG_TLS 0x502 /* Metag TLS pointer */ | 403 | #define NT_METAG_TLS 0x502 /* Metag TLS pointer */ |