libsandbox: new alpha ptrace port

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2 files changed, 60 insertions, 0 deletions

diff --git a/libsandbox/trace/linux/alpha.c b/libsandbox/trace/linux/alpha.c
new file mode 100644
index 0000000..4aa6cd6
--- /dev/null
+++ b/libsandbox/trace/linux/alpha.c
@@ -0,0 +1,58 @@
+#define REG_R0 0
+#define REG_A0 16
+
+#define trace_reg_sysnum r0
+
+static unsigned long trace_arg(void *vregs, int num)
+{
+	trace_regs *regs = vregs;
+	if (num < 7)
+		return *(&regs->r16 + num - 1);
+	else
+		return -1;
+}
+
+static long do_peekuser(long offset)
+{
+	return do_ptrace(PTRACE_PEEKUSER, (void *)offset, NULL);
+}
+
+static long do_pokeuser(long offset, long val)
+{
+	return do_ptrace(PTRACE_POKEUSER, (void *)offset, (void *)val);
+}
+
+#undef trace_get_regs
+static long trace_get_regs(void *vregs)
+{
+	trace_regs *regs = vregs;
+	size_t i;
+	regs->r0 = do_peekuser(REG_R0);
+	for (i = 0; i < 7; ++i)
+		*(&regs->r16 + i) = do_peekuser(REG_A0 + i);
+	return 0;
+}
+
+#undef trace_set_regs
+static long trace_set_regs(void *vregs)
+{
+	trace_regs *regs = vregs;
+	size_t i;
+	do_pokeuser(REG_R0, regs->r0);
+	for (i = 0; i < 7; ++i)
+		do_pokeuser(REG_A0 + i, *(&regs->r16 + i));
+	return 0;
+}
+
+static long trace_raw_ret(void *vregs)
+{
+	trace_regs *regs = vregs;
+	return regs->r16;
+}
+
+static void trace_set_ret(void *vregs, int err)
+{
+	trace_regs *regs = vregs;
+	regs->r0 = -err;
+	trace_set_regs(regs);
+}
diff --git a/libsandbox/trace/linux/arch.c b/libsandbox/trace/linux/arch.c
index 83b6977..1515abe 100644
--- a/libsandbox/trace/linux/arch.c
+++ b/libsandbox/trace/linux/arch.c
@@ -7,6 +7,8 @@
 #if !defined(HAVE_PTRACE) || !defined(HAVE_SYS_PTRACE_H) || \
     !defined(HAVE_SYS_USER_H) || !defined(PTRACE_SETOPTIONS)
 # define SB_NO_TRACE_ARCH
+#elif defined(__alpha__)
+# include "alpha.c"
 #elif defined(__arm__)
 # include "arm.c"
 #elif defined(__bfin__)