Add RISC-V architecture support

The original port of strace was done by Palmer Dabbelt
(eecs.berkeley.edu), based on strace 4.9.

* configure.ac: Define RISCV for riscv*.
* clone.c [RISCV]: Define ARG_* macros as for OR1K.
* defs.h [RISCV] (SUPPORTED_PERSONALITIES): Define to 2.
[RISCV] (NEED_UID16_PARSERS): Define to 1.
* linux/riscv/arch_regs.c: New file.
* linux/riscv/errnoent1.h: Likewise.
* linux/riscv/get_error.c: Likewise.
* linux/riscv/get_scno.c: Likewise.
* linux/riscv/get_syscall_args.c: Likewise.
* linux/riscv/ioctls_arch0.h: Likewise.
* linux/riscv/ioctls_arch1.h: Likewise.
* linux/riscv/ioctls_inc0.h: Likewise.
* linux/riscv/ioctls_inc1.h: Likewise.
* linux/riscv/signalent1.h: Likewise.
* linux/riscv/stat32.h: Likewise.
* linux/riscv/syscallent.h: Likewise.
* linux/riscv/syscallent1.h: Likewise.
* Makefile.am (EXTRA_DIST): Add them.

Signed-off-by: Richard W.M. Jones <rjones@redhat.com>

Makefile.am

@@ -499,6 +499,19 @@ EXTRA_DIST =				\
 	linux/powerpc64/syscallent1.h	\
 	linux/powerpc64/userent.h	\
 	linux/ptp_clock.h		\
+	linux/riscv/arch_regs.c		\
+	linux/riscv/errnoent1.h		\
+	linux/riscv/get_error.c		\
+	linux/riscv/get_scno.c		\
+	linux/riscv/get_syscall_args.c	\
+	linux/riscv/ioctls_arch0.h	\
+	linux/riscv/ioctls_arch1.h	\
+	linux/riscv/ioctls_inc0.h	\
+	linux/riscv/ioctls_inc1.h	\
+	linux/riscv/signalent1.h	\
+	linux/riscv/stat32.h		\
+	linux/riscv/syscallent.h	\
+	linux/riscv/syscallent1.h	\
 	linux/s390/arch_regs.c		\
 	linux/s390/arch_regs.h		\
 	linux/s390/arch_sigreturn.c	\

clone.c

@@ -59,7 +59,7 @@
 # define ARG_PTID	2
 # define ARG_CTID	((current_personality != 1) ? 3 : 4)
 # define ARG_TLS	((current_personality != 1) ? 4 : 3)
-#elif defined ALPHA || defined TILE || defined OR1K
+#elif defined ALPHA || defined TILE || defined OR1K || defined RISCV
 # define ARG_FLAGS	0
 # define ARG_STACK	1
 # define ARG_PTID	2

configure.ac

@@ -187,6 +187,11 @@ xtensa*)
 	AC_DEFINE([XTENSA], 1, [Define for the Xtensa architecture])
 	;;
 
+riscv*)
+	arch=riscv
+	AC_DEFINE([RISCV], 1, [Define for the RISC-V architecture])
+	;;
+
 *)
 	AC_MSG_RESULT([NO!])
 	AC_MSG_ERROR([architecture $host_cpu is not supported by strace])

defs.h

@@ -156,6 +156,7 @@ extern char *stpcpy(char *dst, const char *src);
 # define PERSONALITY2_WORDSIZE 4
 #elif defined AARCH64 \
    || defined POWERPC64 \
+   || defined RISCV \
    || defined SPARC64 \
    || defined TILE \
    || defined X32
@@ -357,6 +358,7 @@ extern const struct xlat whence_codes[];
  || defined(BFIN) \
  || defined(M68K) \
  || defined(MICROBLAZE) \
+ || defined(RISCV) \
  || defined(S390) \
  || defined(SH) || defined(SH64) \
  || defined(SPARC) || defined(SPARC64) \

linux/riscv/arch_regs.c

@@ -0,0 +1,3 @@
+static struct user_regs_struct riscv_regs;
+#define ARCH_REGS_FOR_GETREGSET riscv_regs
+#define ARCH_PC_REG riscv_regs.pc

linux/riscv/errnoent1.h

@@ -0,0 +1,2 @@
+/* RISC-V rv32 and rv64 */
+#include "../errnoent.h"

linux/riscv/get_error.c

@@ -0,0 +1,10 @@
+static void
+get_error(struct tcb *tcp, const bool check_errno)
+{
+	if (check_errno && is_negated_errno(riscv_regs.a0)) {
+		tcp->u_rval = -1;
+		tcp->u_error = -riscv_regs.a0;
+	} else {
+		tcp->u_rval = riscv_regs.a0;
+	}
+}

linux/riscv/get_scno.c

@@ -0,0 +1,7 @@
+/* Return codes: 1 - ok, 0 - ignore, other - error. */
+static int
+arch_get_scno(struct tcb *tcp)
+{
+	tcp->scno = riscv_regs.a7;
+	return 1;
+}

linux/riscv/get_syscall_args.c

@@ -0,0 +1,12 @@
+/* Return -1 on error or 1 on success (never 0!). */
+static int
+get_syscall_args(struct tcb *tcp)
+{
+	tcp->u_arg[0] = riscv_regs.a0;
+	tcp->u_arg[1] = riscv_regs.a1;
+	tcp->u_arg[2] = riscv_regs.a2;
+	tcp->u_arg[3] = riscv_regs.a3;
+	tcp->u_arg[4] = riscv_regs.a4;
+	tcp->u_arg[5] = riscv_regs.a5;
+	return 1;
+}

linux/riscv/ioctls_arch0.h

@@ -0,0 +1 @@
+/* Generated by ioctls_gen.sh from definitions found in $linux/arch/riscv/include/ tree. */

linux/riscv/ioctls_arch1.h

@@ -0,0 +1 @@
+#include "ioctls_arch0.h"

linux/riscv/ioctls_inc0.h

@@ -0,0 +1 @@
+#include "64/ioctls_inc.h"

linux/riscv/ioctls_inc1.h

@@ -0,0 +1 @@
+#include "32/ioctls_inc.h"

linux/riscv/signalent1.h

@@ -0,0 +1,2 @@
+/* RISC-V rv32 and rv64 */
+#include "../signalent.h"

linux/riscv/stat32.h

@@ -0,0 +1 @@
+/* no 32-bit stat */

linux/riscv/syscallent.h

@@ -0,0 +1 @@
+#include "64/syscallent.h"

linux/riscv/syscallent1.h

@@ -0,0 +1 @@
+#include "32/syscallent.h"