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authorH.J. Lu <hjl.tools@gmail.com>2012-03-05 15:32:11 -0800
committerH. Peter Anvin <hpa@zytor.com>2012-03-05 15:43:45 -0800
commit55283e2537714f9370c4ab847d170acf223daf90 (patch)
treee20a2212d4de9d91c4b986a2a8dba5197516213e /arch/x86/syscalls
parente7084fd52ed71249ab2ce7a7d89d601c9d1f904c (diff)
downloadblackbird-obmc-linux-55283e2537714f9370c4ab847d170acf223daf90.tar.gz
blackbird-obmc-linux-55283e2537714f9370c4ab847d170acf223daf90.zip
x32: Add ptrace for x32
X32 ptrace is a hybrid of 64bit ptrace and compat ptrace with 32bit address and longs. It use 64bit ptrace to access the full 64bit registers. PTRACE_PEEKUSR and PTRACE_POKEUSR are only allowed to access segment and debug registers. PTRACE_PEEKUSR returns the lower 32bits and PTRACE_POKEUSR zero-extends 32bit value to 64bit. It works since the upper 32bits of segment and debug registers of x32 process are always zero. GDB only uses PTRACE_PEEKUSR and PTRACE_POKEUSR to access segment and debug registers. [ hpa: changed TIF_X32 test to use !is_ia32_task() instead, and moved the system call number to the now-unused 521 slot. ] Signed-off-by: "H.J. Lu" <hjl.tools@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: Roland McGrath <roland@hack.frob.com> Cc: Oleg Nesterov <oleg@redhat.com> Link: http://lkml.kernel.org/r/1329696488-16970-1-git-send-email-hpa@zytor.com
Diffstat (limited to 'arch/x86/syscalls')
-rw-r--r--arch/x86/syscalls/syscall_64.tbl4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/syscalls/syscall_64.tbl b/arch/x86/syscalls/syscall_64.tbl
index 0d778b800884..dd29a9ea27c5 100644
--- a/arch/x86/syscalls/syscall_64.tbl
+++ b/arch/x86/syscalls/syscall_64.tbl
@@ -107,7 +107,7 @@
98 common getrusage sys_getrusage
99 common sysinfo sys_sysinfo
100 common times sys_times
-101 common ptrace sys_ptrace
+101 64 ptrace sys_ptrace
102 common getuid sys_getuid
103 common syslog sys_syslog
104 common getgid sys_getgid
@@ -331,7 +331,7 @@
518 x32 sendmsg compat_sys_sendmsg
519 x32 recvmsg compat_sys_recvmsg
520 x32 execve stub_x32_execve
-# 521 available
+521 x32 ptrace compat_sys_ptrace
522 x32 rt_sigpending sys32_rt_sigpending
523 x32 rt_sigtimedwait compat_sys_rt_sigtimedwait
524 x32 rt_sigqueueinfo sys32_rt_sigqueueinfo
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