From: chenguoqi <chenguoqi@loongson.cn>
Date: Thu, 8 Jun 2023 06:04:26 +0000 (+0800)
Subject: syscall: implement Ptrace{Set,Get}Regs using PTRACE_{GET,SET}REGSET on all linux... 
X-Git-Tag: go1.21rc1~42
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=fafa4091abb4ed6de6ff4daef67ef1cf9db40923;p=gostls13.git

syscall: implement Ptrace{Set,Get}Regs using PTRACE_{GET,SET}REGSET on all linux platforms

In the ptrace system call, most of the newer architectures (e.g. arm64,riscv64,loong64)
do not provide support for the command PTRACE_{GET, SET}REGS.

The Linux kernel 2.6.33-rc7[1] introduces support for the command PTRACE_{GET,SET}REGSET,
which exports different types of register sets depending on the NT_* types, completely
overriding the functionality provided by PTRACE_{GET,SET}REGS.

[1] https://lore.kernel.org/all/20100211195614.886724710@sbs-t61.sc.intel.com/

Fixes #60679.

Change-Id: I8c2671d64a7ecd654834740f4f1e1e50c00edcae
Reviewed-on: https://go-review.googlesource.com/c/go/+/501756
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
---

diff --git a/src/syscall/syscall_linux.go b/src/syscall/syscall_linux.go
index 618b2e6d42..a2768e1845 100644
--- a/src/syscall/syscall_linux.go
+++ b/src/syscall/syscall_linux.go
@@ -936,12 +936,22 @@ func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
 	return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
 }
 
+const (
+	_NT_PRSTATUS = 1
+)
+
 func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) {
-	return ptracePtr(PTRACE_GETREGS, pid, 0, unsafe.Pointer(regsout))
+	var iov Iovec
+	iov.Base = (*byte)(unsafe.Pointer(regsout))
+	iov.SetLen(int(unsafe.Sizeof(*regsout)))
+	return ptracePtr(PTRACE_GETREGSET, pid, uintptr(_NT_PRSTATUS), unsafe.Pointer(&iov))
 }
 
 func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
-	return ptracePtr(PTRACE_SETREGS, pid, 0, unsafe.Pointer(regs))
+	var iov Iovec
+	iov.Base = (*byte)(unsafe.Pointer(regs))
+	iov.SetLen(int(unsafe.Sizeof(*regs)))
+	return ptracePtr(PTRACE_SETREGSET, pid, uintptr(_NT_PRSTATUS), unsafe.Pointer(&iov))
 }
 
 func PtraceSetOptions(pid int, options int) (err error) {