git: ab52de447881 - stable/13 - linux: Make linux_ptrace.c portable

The branch stable/13 has been updated by dchagin:

URL: https://cgit.FreeBSD.org/src/commit/?id=ab52de4478816f50f62da19d82eaabac30eaee30

commit ab52de4478816f50f62da19d82eaabac30eaee30
Author:     Edward Tomasz Napierala <trasz@FreeBSD.org>
AuthorDate: 2021-11-03 08:54:30 +0000
Commit:     Dmitry Chagin <dchagin@FreeBSD.org>
CommitDate: 2022-06-17 19:33:35 +0000

    linux: Make linux_ptrace.c portable
    
    Make sys/amd64/linux/linux_ptrace.c machine-independent,
    in preparation for moving it into sys/compat/linux/.
    No functional changes.
    
    Reviewed By:    kib
    Sponsored By:   EPSRC
    Differential Revision:  https://reviews.freebsd.org/D32756
    
    (cherry picked from commit c91d0e59be10f9412cbce467b8b038f006bb6f18)
---
 sys/amd64/linux/linux_ptrace.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/sys/amd64/linux/linux_ptrace.c b/sys/amd64/linux/linux_ptrace.c
index 35b66522cf06..a227aa1069eb 100644
--- a/sys/amd64/linux/linux_ptrace.c
+++ b/sys/amd64/linux/linux_ptrace.c
@@ -108,6 +108,7 @@ __FBSDID("$FreeBSD$");
 #define LINUX_PTRACE_PEEKUSER_DS	184
 
 #define	LINUX_ARCH_AMD64		0xc000003e
+#define	LINUX_ARCH_AARCH64		0xc00000b7
 
 static int
 map_signum(int lsig, int *bsigp)
@@ -217,6 +218,7 @@ linux_ptrace_peekuser(struct thread *td, pid_t pid, void *addr, void *data)
 		return (error);
 
 	switch ((uintptr_t)addr) {
+#ifdef __amd64__
 	case LINUX_PTRACE_PEEKUSER_ORIG_RAX:
 		val = b_reg.r_rax;
 		break;
@@ -229,6 +231,7 @@ linux_ptrace_peekuser(struct thread *td, pid_t pid, void *addr, void *data)
 	case LINUX_PTRACE_PEEKUSER_DS:
 		val = b_reg.r_ds;
 		break;
+#endif /* __amd64__ */
 	default:
 		linux_msg(td, "PTRACE_PEEKUSER offset %ld not implemented; "
 		    "returning EINVAL", (uintptr_t)addr);
@@ -343,20 +346,25 @@ linux_ptrace_getregs(struct thread *td, pid_t pid, void *data)
 	struct ptrace_lwpinfo lwpinfo;
 	struct reg b_reg;
 	struct linux_pt_regset l_regset;
+#ifdef __amd64__
 	struct pcb *pcb;
+#endif
 	int error;
 
 	error = kern_ptrace(td, PT_GETREGS, pid, &b_reg, 0);
 	if (error != 0)
 		return (error);
 
+	bsd_to_linux_regset(&b_reg, &l_regset);
+
+#ifdef __amd64__
 	pcb = td->td_pcb;
 	if (td == curthread)
 		update_pcb_bases(pcb);
 
-	bsd_to_linux_regset(&b_reg, &l_regset);
 	l_regset.fs_base = pcb->pcb_fsbase;
 	l_regset.gs_base = pcb->pcb_gsbase;
+#endif
 
 	error = kern_ptrace(td, PT_LWPINFO, pid, &lwpinfo, sizeof(lwpinfo));
 	if (error != 0) {
@@ -404,7 +412,9 @@ linux_ptrace_getregset_prstatus(struct thread *td, pid_t pid, l_ulong data)
 	struct reg b_reg;
 	struct linux_pt_regset l_regset;
 	struct iovec iov;
+#ifdef __amd64__
 	struct pcb *pcb;
+#endif
 	size_t len;
 	int error;
 
@@ -418,13 +428,16 @@ linux_ptrace_getregset_prstatus(struct thread *td, pid_t pid, l_ulong data)
 	if (error != 0)
 		return (error);
 
+	bsd_to_linux_regset(&b_reg, &l_regset);
+
+#ifdef __amd64__
 	pcb = td->td_pcb;
 	if (td == curthread)
 		update_pcb_bases(pcb);
 
-	bsd_to_linux_regset(&b_reg, &l_regset);
 	l_regset.fs_base = pcb->pcb_fsbase;
 	l_regset.gs_base = pcb->pcb_gsbase;
+#endif
 
 	error = kern_ptrace(td, PT_LWPINFO, pid, &lwpinfo, sizeof(lwpinfo));
 	if (error != 0) {
@@ -569,9 +582,17 @@ linux_ptrace_get_syscall_info(struct thread *td, pid_t pid,
 	if (error != 0)
 		return (error);
 
+#if defined(__amd64__)
 	si.arch = LINUX_ARCH_AMD64;
 	si.instruction_pointer = b_reg.r_rip;
 	si.stack_pointer = b_reg.r_rsp;
+#elif defined(__aarch64__)
+	si.arch = LINUX_ARCH_AARCH64;
+	si.instruction_pointer = b_reg.lr;
+	si.stack_pointer = b_reg.sp;
+#else
+#error "unknown architecture"
+#endif
 
 	len = MIN(len, sizeof(si));
 	error = copyout(&si, (void *)data, len);