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From 49d122ed52a798bb0752947cc5ffd1f909681a74 Mon Sep 17 00:00:00 2001
From: laokz <laokz@foxmail.com>
Date: Sat, 30 Jul 2022 18:18:28 +0800
Subject: [PATCH] riscv64: add initial riscv64 support
Following RISC-V ISA and ABI spec, add basic ltrace function
support. Now, it can be built on RISC-V lp64d platform and
trace syscall, library and app functions.
close: #7 #12
Signed-off-by: Kai Zhang <laokz@foxmail.com>
---
README | 1 +
configure.ac | 3 +
sysdeps/linux-gnu/Makefile.am | 4 +-
sysdeps/linux-gnu/riscv64/Makefile.am | 35 ++
sysdeps/linux-gnu/riscv64/arch.h | 47 +++
sysdeps/linux-gnu/riscv64/fetch.c | 450 ++++++++++++++++++++++++
sysdeps/linux-gnu/riscv64/plt.c | 72 ++++
sysdeps/linux-gnu/riscv64/ptrace.h | 22 ++
sysdeps/linux-gnu/riscv64/regs.c | 74 ++++
sysdeps/linux-gnu/riscv64/signalent.h | 52 +++
sysdeps/linux-gnu/riscv64/syscallent.h | 461 +++++++++++++++++++++++++
sysdeps/linux-gnu/riscv64/trace.c | 79 +++++
12 files changed, 1299 insertions(+), 1 deletion(-)
create mode 100644 sysdeps/linux-gnu/riscv64/Makefile.am
create mode 100644 sysdeps/linux-gnu/riscv64/arch.h
create mode 100644 sysdeps/linux-gnu/riscv64/fetch.c
create mode 100644 sysdeps/linux-gnu/riscv64/plt.c
create mode 100644 sysdeps/linux-gnu/riscv64/ptrace.h
create mode 100644 sysdeps/linux-gnu/riscv64/regs.c
create mode 100644 sysdeps/linux-gnu/riscv64/signalent.h
create mode 100644 sysdeps/linux-gnu/riscv64/syscallent.h
create mode 100644 sysdeps/linux-gnu/riscv64/trace.c
diff --git a/README b/README
index c37b764..3d0cae1 100644
--- a/README
+++ b/README
@@ -35,6 +35,7 @@ to test each release comprehensively on each target.
mips-*-linux-gnu
powerpc-*-linux-gnu
powerpc64-*-linux-gnu
+ riscv64-linux-gnu
s390-*-linux-gnu
s390x-*-linux-gnu
x86_64-*-linux-gnu
diff --git a/configure.ac b/configure.ac
index d24c505..63ea6a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,6 +45,7 @@ case "${host_cpu}" in
loongarch*) HOST_CPU="loongarch" ;;
mips*) HOST_CPU="mips" ;;
powerpc|powerpc64) HOST_CPU="ppc" ;;
+ riscv64) HOST_CPU="riscv64" ;;
sun4u|sparc64) HOST_CPU="sparc" ;;
s390x) HOST_CPU="s390" ;;
i?86|x86_64) HOST_CPU="x86" ;;
@@ -219,6 +220,7 @@ if test x"$enable_libunwind" = xyes; then
powerpc64) UNWIND_ARCH="ppc64" ;;
mips*) UNWIND_ARCH="mips" ;;
loongarch*) UNWIND_ARCH="loongarch" ;;
+ riscv*) UNWIND_ARCH="riscv" ;;
*) UNWIND_ARCH="${host_cpu}" ;;
esac
@@ -414,6 +416,7 @@ AC_CONFIG_FILES([
sysdeps/linux-gnu/metag/Makefile
sysdeps/linux-gnu/mips/Makefile
sysdeps/linux-gnu/ppc/Makefile
+ sysdeps/linux-gnu/riscv64/Makefile
sysdeps/linux-gnu/s390/Makefile
sysdeps/linux-gnu/sparc/Makefile
sysdeps/linux-gnu/x86/Makefile
diff --git a/sysdeps/linux-gnu/Makefile.am b/sysdeps/linux-gnu/Makefile.am
index 2c25d59..2d61645 100644
--- a/sysdeps/linux-gnu/Makefile.am
+++ b/sysdeps/linux-gnu/Makefile.am
@@ -18,7 +18,7 @@
# 02110-1301 USA
DIST_SUBDIRS = aarch64 alpha arm cris ia64 loongarch m68k metag mips \
- ppc s390 sparc x86
+ ppc riscv64 s390 sparc x86
SUBDIRS = \
$(HOST_CPU)
diff --git a/sysdeps/linux-gnu/riscv64/Makefile.am b/sysdeps/linux-gnu/riscv64/Makefile.am
new file mode 100644
index 0000000..f018dfc
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/Makefile.am
@@ -0,0 +1,35 @@
+# This file is part of ltrace.
+# Copyright (C) 2010 Marc Kleine-Budde, Pengutronix
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+noinst_LTLIBRARIES = \
+ ../libcpu.la
+
+___libcpu_la_SOURCES = \
+ fetch.c \
+ plt.c \
+ regs.c \
+ trace.c
+
+noinst_HEADERS = \
+ arch.h \
+ ptrace.h \
+ signalent.h \
+ syscallent.h
+
+MAINTAINERCLEANFILES = \
+ Makefile.in
diff --git a/sysdeps/linux-gnu/riscv64/arch.h b/sysdeps/linux-gnu/riscv64/arch.h
new file mode 100644
index 0000000..5f5b0fe
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/arch.h
@@ -0,0 +1,47 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef LTRACE_RISCV64_ARCH_H
+#define LTRACE_RISCV64_ARCH_H
+
+#include <elf.h>
+
+#define ARCH_ENDIAN_LITTLE
+
+/* ebreak */
+#define BREAKPOINT_VALUE { 0x73, 0x00, 0x10, 0x00 }
+#define BREAKPOINT_LENGTH 4
+#define DECR_PC_AFTER_BREAK 0
+
+#define LT_ELFCLASS ELFCLASS64
+#define LT_ELF_MACHINE EM_RISCV
+
+#define ARCH_HAVE_SW_SINGLESTEP
+
+#define ARCH_HAVE_ADD_PLT_ENTRY
+
+#define ARCH_HAVE_FETCH_ARG
+#define ARCH_HAVE_FETCH_PACK
+
+#define ARCH_HAVE_LTELF_DATA
+struct arch_ltelf_data {
+};
+
+#endif
diff --git a/sysdeps/linux-gnu/riscv64/fetch.c b/sysdeps/linux-gnu/riscv64/fetch.c
new file mode 100644
index 0000000..8ea943b
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/fetch.c
@@ -0,0 +1,450 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/uio.h>
+#include <assert.h>
+#include <errno.h>
+#include "backend.h"
+#include "fetch.h"
+#include "type.h"
+#include "proc.h"
+#include "value.h"
+#include "ptrace.h"
+#include "param.h"
+
+#define ARG_REG_FIRST 10
+#define ARG_REG_LAST 17
+
+/*
+ * Where to fetch argument/return value.
+ * According to Integer Calling Convention(ICC) and Hardware
+ * Floating-point Calling Convention(FCC), at most 2×XLEN bits
+ * -- 2 words be fetched for one value.
+ */
+enum fetch_class {
+ CLASS_G, /* only from one place, general register, */
+ CLASS_F, /* float register, or stack, */
+ CLASS_STACK, /* maybe 1 or 2 word(s) */
+ CLASS_G_F, /* both from two places */
+ CLASS_F_G,
+ CLASS_G_STACK,
+ CLASS_F_STACK,
+ CLASS_STACK_F,
+ CLASS_F_F, /* specific for struct {float;float} */
+};
+
+struct fetch_context {
+ struct user_regs_struct gregs;
+ struct __riscv_d_ext_state fregs;
+
+ int gidx; /* next argument register index */
+ int fidx; /* into above regs */
+ arch_addr_t sp; /* next argument stack address */
+ int is_variadic; /* if variadic argument */
+ struct value retval;/* used when return value > 128bit */
+};
+
+static int
+fetch_register_banks(struct process *proc, struct fetch_context *ctx)
+{
+ struct iovec data = {&ctx->gregs, sizeof(struct user_regs_struct)};
+ if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, &data) == -1) {
+ perror("PTRACE_GETREGSET NT_PRSTATUS");
+ return -1;
+ }
+
+ data.iov_base = &ctx->fregs.f;
+ data.iov_len = sizeof(struct __riscv_d_ext_state);
+ if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRFPREG, &data) == -1) {
+ perror("PTRACE_GETREGSET NT_PRFPREG");
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Same as type_get_fp_equivalent but for INTEGER.
+ * Note, pointer is not INTERGER.
+ */
+static struct arg_type_info *
+type_get_int_equivalent(struct arg_type_info *info)
+{
+ while (info->type == ARGTYPE_STRUCT) {
+ if (type_struct_size(info) != 1)
+ return NULL;
+ info = type_element(info, 0);
+ }
+
+ switch (info->type) {
+ case ARGTYPE_CHAR:
+ case ARGTYPE_SHORT:
+ case ARGTYPE_INT:
+ case ARGTYPE_LONG:
+ case ARGTYPE_UINT:
+ case ARGTYPE_ULONG:
+ case ARGTYPE_USHORT:
+ return info;
+ default:
+ break;
+ }
+
+ return NULL;
+}
+
+static inline enum fetch_class
+icc_class(struct fetch_context *ctx, size_t sz)
+{
+ if (ctx->gidx > ARG_REG_LAST)
+ return CLASS_STACK;
+ if ((ctx->gidx == ARG_REG_LAST) && (sz > 8))
+ return CLASS_G_STACK;
+ return CLASS_G;
+}
+
+/*
+ * Determine fetch_class which typesize > 0 and <= 128bits.
+ * Treat syscall exactly the same as function call, hope
+ * not break the system??
+ */
+static enum fetch_class
+get_fetch_class(struct fetch_context *ctx, struct process *proc,
+ struct arg_type_info *info)
+{
+ size_t sz = type_sizeof(proc, info);
+
+ /* variadic arguments are passed according to ICC */
+ if (ctx->is_variadic) {
+ if (sz <= 8)
+ return (ctx->gidx > ARG_REG_LAST) ? CLASS_STACK : CLASS_G;
+
+ /* 2×XLEN bits variadic must in an aligned register pair */
+ if (ctx->gidx == ARG_REG_LAST) {
+ ctx->gidx++;
+ return CLASS_STACK;
+ }
+ if (ctx->gidx % 2)
+ ctx->gidx++;
+ return CLASS_G;
+ }
+
+ switch (info->type) {
+ case ARGTYPE_INT:
+ case ARGTYPE_UINT:
+ case ARGTYPE_LONG:
+ case ARGTYPE_ULONG:
+ case ARGTYPE_CHAR:
+ case ARGTYPE_SHORT:
+ case ARGTYPE_USHORT:
+ case ARGTYPE_POINTER:
+ if (ctx->gidx > ARG_REG_LAST)
+ return CLASS_STACK;
+ return CLASS_G;
+
+ case ARGTYPE_FLOAT:
+ case ARGTYPE_DOUBLE:
+ if ((ctx->gidx > ARG_REG_LAST) && (ctx->fidx > ARG_REG_LAST))
+ return CLASS_STACK;
+ else if (ctx->fidx > ARG_REG_LAST)
+ return CLASS_G;
+ return CLASS_F;
+
+ /* not support 'packed' 'aligned' attribute as ltrace doesn't */
+ case ARGTYPE_STRUCT:
+ /* try FCC first */
+ if (type_struct_size(info) == 2) {
+ struct arg_type_info *arg0 = type_struct_get(info, 0);
+ struct arg_type_info *arg1 = type_struct_get(info, 1);
+
+ /* {float;float} */
+ if ((type_get_fp_equivalent(arg0) != NULL) &&
+ (type_get_fp_equivalent(arg1) != NULL)) {
+ if (ctx->fidx >= ARG_REG_LAST)
+ return icc_class(ctx, sz);
+ /*
+ * A struct containing two floating-point reals is passed
+ * in two floating-point registers, though its total size
+ * might be 8.
+ */
+ return CLASS_F_F;
+ }
+
+ /* {float;int} */
+ if ((type_get_fp_equivalent(arg0) != NULL) &&
+ (type_get_int_equivalent(arg1) != NULL)) {
+ if (ctx->fidx > ARG_REG_LAST)
+ return icc_class(ctx, sz);
+ if (ctx->gidx > ARG_REG_LAST)
+ return CLASS_F_STACK;
+ return CLASS_F_G;
+ }
+
+ /* {int;float} */
+ if ((type_get_int_equivalent(arg0) != NULL) &&
+ (type_get_fp_equivalent(arg1) != NULL)) {
+ if (ctx->fidx > ARG_REG_LAST)
+ return icc_class(ctx, sz);
+ if (ctx->gidx > ARG_REG_LAST)
+ return CLASS_STACK_F;
+ return CLASS_G_F;
+ }
+ } else if (type_get_fp_equivalent(info) != NULL) { /* {float} */
+ if (ctx->fidx > ARG_REG_LAST) {
+ if (ctx->gidx > ARG_REG_LAST)
+ return CLASS_STACK;
+ return CLASS_G;
+ }
+ return CLASS_F;
+ }
+
+ return icc_class(ctx, sz);
+
+ default:
+ abort();
+ }
+}
+
+static inline unsigned long
+fetch_stack_word(struct fetch_context *ctx, struct process *proc)
+{
+ long v = ptrace(PTRACE_PEEKDATA, proc->pid, ctx->sp, 0);
+ if ((v == -1) && errno) {
+ perror("PTRACE_PEEKDATA");
+ abort();
+ }
+ ctx->sp += 8;
+ return (unsigned long)v;
+}
+
+/* Fetch value whose size no more than 128 bits */
+static int
+fetch_value(struct fetch_context *ctx, struct process *proc,
+ struct value *valp, enum fetch_class c, size_t sz)
+{
+ unsigned long *p = (unsigned long *)value_reserve(valp, align(sz, 8));
+ if (p == NULL) {
+ fprintf(stderr, "value_reserve failed\n");
+ return -1;
+ }
+
+ unsigned long *gr = &ctx->gregs.pc;
+
+ switch (c) {
+ case CLASS_G:
+ p[0] = gr[ctx->gidx++];
+ if (sz > 8)
+ p[1] = gr[ctx->gidx++];
+ break;
+
+ case CLASS_F:
+ p[0] = ctx->fregs.f[ctx->fidx++];
+ if (sz > 8)
+ p[1] = ctx->fregs.f[ctx->fidx++];
+ break;
+
+ case CLASS_STACK:
+ p[0] = fetch_stack_word(ctx, proc);
+ if (sz > 8)
+ p[1] = fetch_stack_word(ctx, proc);
+ break;
+
+ case CLASS_G_F:
+ p[0] = gr[ctx->gidx++];
+ p[1] = ctx->fregs.f[ctx->fidx++];
+ break;
+
+ case CLASS_F_G:
+ p[0] = ctx->fregs.f[ctx->fidx++];
+ p[1] = gr[ctx->gidx++];
+ break;
+
+ case CLASS_F_F:
+ p[0] = ctx->fregs.f[ctx->fidx++];
+ unsigned long u = ctx->fregs.f[ctx->fidx++];
+ if (sz > 8)
+ p[1] = u;
+ else /* struct{float;float;} use 2 fregs, occupy 1 word memory */
+ p[0] = ((u & 0xFFFFFFFF) << 32) | (p[0] & 0xFFFFFFFF);
+ break;
+
+ case CLASS_G_STACK:
+ p[0] = gr[ctx->gidx++];
+ p[1] = fetch_stack_word(ctx, proc);
+ break;
+
+ case CLASS_F_STACK:
+ p[0] = ctx->fregs.f[ctx->fidx++];
+ p[1] = fetch_stack_word(ctx, proc);
+ break;
+
+ case CLASS_STACK_F:
+ p[0] = fetch_stack_word(ctx, proc);
+ p[1] = ctx->fregs.f[ctx->fidx++];
+ break;
+ }
+
+ return 0;
+}
+
+/* value larger than 128bit is transferred to reference */
+static int
+fetch_larger(struct fetch_context *ctx, struct process *proc,
+ struct arg_type_info *info, struct value *valp)
+{
+ value_init(valp, proc, NULL, info, 0);
+ if (value_pass_by_reference(valp) != 0) {
+ fprintf(stderr, "value_pass_by_reference failed\n");
+ return -1;
+ }
+
+ enum fetch_class c = get_fetch_class(ctx, proc, valp->type);
+ return fetch_value(ctx, proc, valp, c, 8);
+}
+
+struct fetch_context *
+arch_fetch_arg_init(enum tof type, struct process *proc,
+ struct arg_type_info *ret_info)
+{
+ struct fetch_context *ctx = malloc(sizeof(*ctx));
+ if (ctx == NULL) {
+ perror("arch_fetch_arg_init");
+ return NULL;
+ }
+
+ if (fetch_register_banks(proc, ctx) == -1)
+ goto ERR_OUT;
+
+ ctx->gidx = ARG_REG_FIRST;
+ ctx->fidx = ARG_REG_FIRST;
+ /*
+ * When hit this function, the stack pointer is pointing to the
+ * 1st argument, not the return address.
+ */
+ ctx->sp = (arch_addr_t)ctx->gregs.sp;
+ ctx->is_variadic = 0;
+
+ size_t sz = type_sizeof(proc, ret_info);
+ assert(sz != (size_t)-1);
+ if (sz > 16) {
+ /*
+ * Return value larger than 128bit will be passed by reference,
+ * and address stored as an implicit first parameter.
+ * We must fetch and save it first.
+ */
+ if (fetch_larger(ctx, proc, ret_info, &ctx->retval) == -1)
+ goto ERR_OUT;
+ } else {
+ value_init_detached(&ctx->retval, NULL, NULL, 0);
+ }
+
+ return ctx;
+
+ERR_OUT:
+ free(ctx);
+ return NULL;
+}
+
+struct fetch_context *
+arch_fetch_arg_clone(struct process *proc, struct fetch_context *ctx)
+{
+ struct fetch_context *clone = malloc(sizeof(*ctx));
+ if (clone == NULL) {
+ perror("arch_fetch_arg_clone");
+ return NULL;
+ }
+
+ *clone = *ctx;
+ return clone;
+}
+
+int
+arch_fetch_retval(struct fetch_context *ctx, enum tof type,
+ struct process *proc, struct arg_type_info *info,
+ struct value *valp)
+{
+ if (fetch_register_banks(proc, ctx) == -1)
+ return -1;
+
+ /* if we already prefetched its reference address */
+ if (ctx->retval.type != NULL) {
+ *valp = ctx->retval;
+ return 0;
+ }
+
+ size_t sz = type_sizeof(proc, info);
+ assert(sz != (size_t)-1);
+
+ if (sz == 0)
+ return 0;
+
+ ctx->gidx = ARG_REG_FIRST;
+ ctx->fidx = ARG_REG_FIRST;
+ enum fetch_class c = get_fetch_class(ctx, proc, info);
+ return fetch_value(ctx, proc, valp, c, sz);
+}
+
+int
+arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
+ struct process *proc, struct arg_type_info *info,
+ struct value *valp)
+{
+ /* why we got ARGTYPE_ARRAY?? */
+ assert(info->type != ARGTYPE_ARRAY);
+
+ size_t sz = type_sizeof(proc, info);
+ assert(sz != (size_t)-1);
+
+ if (sz == 0)
+ return 0;
+
+ if (sz > 16)
+ return fetch_larger(ctx, proc, info, valp);
+
+ enum fetch_class c = get_fetch_class(ctx, proc, info);
+ return fetch_value(ctx, proc, valp, c, sz);
+}
+
+void
+arch_fetch_arg_done(struct fetch_context *ctx)
+{
+ free(ctx);
+}
+
+int
+arch_fetch_param_pack_start(struct fetch_context *ctx,
+ enum param_pack_flavor ppflavor)
+{
+ /*
+ * Leave out PARAM_PACK_ARGS and return garbage if any.
+ *
+ * For PARAM_PACK_VARARGS - variable arguments, once met
+ * than all the left arguments are also variadic.
+ */
+ if (!ctx->is_variadic && (ppflavor == PARAM_PACK_VARARGS))
+ ctx->is_variadic = 1;
+ return 0;
+}
+
+void
+arch_fetch_param_pack_end(struct fetch_context *ctx)
+{
+}
diff --git a/sysdeps/linux-gnu/riscv64/plt.c b/sysdeps/linux-gnu/riscv64/plt.c
new file mode 100644
index 0000000..abffe97
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/plt.c
@@ -0,0 +1,72 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <sys/uio.h>
+#include <gelf.h>
+#include "ltrace-elf.h"
+#include "proc.h"
+#include "backend.h"
+#include "breakpoint.h"
+#include "ptrace.h"
+#include "library.h"
+#include "trace.h"
+
+GElf_Addr
+arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela *rela)
+{
+ if (GELF_R_TYPE(rela->r_info) == R_RISCV_IRELATIVE)
+ return rela->r_addend;// what shall we return ??
+
+ return lte->plt_addr + 16 * 2 + (ndx * 16);
+}
+
+void *
+sym2addr(struct process *proc, struct library_symbol *sym)
+{
+ return sym->enter_addr;
+}
+
+enum plt_status
+arch_elf_add_plt_entry(struct process *proc, struct ltelf *lte,
+ const char *name, GElf_Rela *rela,
+ size_t i, struct library_symbol **ret)
+{
+ if (GELF_R_TYPE(rela->r_info) == R_RISCV_IRELATIVE)
+ return linux_elf_add_plt_entry_irelative(proc, lte, rela, i, ret);
+
+ return PLT_DEFAULT;
+}
+
+int
+arch_elf_init(struct ltelf *lte, struct library *lib)
+{
+ if ((lte->ehdr.e_flags & EF_RISCV_FLOAT_ABI) !=
+ EF_RISCV_FLOAT_ABI_DOUBLE) {
+ fprintf(stderr, "failed: only LP64D ABI supported\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+void
+arch_elf_destroy(struct ltelf *lte)
+{
+}
diff --git a/sysdeps/linux-gnu/riscv64/ptrace.h b/sysdeps/linux-gnu/riscv64/ptrace.h
new file mode 100644
index 0000000..37b375c
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/ptrace.h
@@ -0,0 +1,22 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <sys/ptrace.h>
+#include <asm/ptrace.h>
diff --git a/sysdeps/linux-gnu/riscv64/regs.c b/sysdeps/linux-gnu/riscv64/regs.c
new file mode 100644
index 0000000..ff29756
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/regs.c
@@ -0,0 +1,74 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <sys/uio.h>
+#include "proc.h"
+#include "ptrace.h"
+
+/* read tracee general registers */
+long
+riscv64_read_gregs(struct process *proc, struct user_regs_struct *regs)
+{
+ struct iovec data = {regs, sizeof(*regs)};
+ if (ptrace(PTRACE_GETREGSET, proc->pid, NT_PRSTATUS, &data) == -1) {
+ perror("riscv64_read_gregs");
+ return -1;
+ }
+ return 0;
+}
+
+void *
+get_instruction_pointer(struct process *proc)
+{
+ struct user_regs_struct regs;
+ /* RISC-V does not support PTRACE_PEEKUSER, PTRACE_GETREGS */
+ if (riscv64_read_gregs(proc, ®s) == -1)
+ return NULL;
+ return (void *)regs.pc;
+}
+
+void
+set_instruction_pointer(struct process *proc, void *addr)
+{
+ struct user_regs_struct regs;
+ if (riscv64_read_gregs(proc, ®s) == -1)
+ return;
+ regs.pc = (unsigned long)addr;
+ struct iovec data = {®s, sizeof(regs)};
+ ptrace(PTRACE_SETREGSET, proc->pid, NT_PRSTATUS, &data);
+}
+
+void *
+get_stack_pointer(struct process *proc)
+{
+ struct user_regs_struct regs;
+ if (riscv64_read_gregs(proc, ®s) == -1)
+ return NULL;
+ return (void *)regs.sp;
+}
+
+void *
+get_return_addr(struct process *proc, void *stack_pointer)
+{
+ struct user_regs_struct regs;
+ if (riscv64_read_gregs(proc, ®s) == -1)
+ return NULL;
+ return (void *)regs.ra;
+}
diff --git a/sysdeps/linux-gnu/riscv64/signalent.h b/sysdeps/linux-gnu/riscv64/signalent.h
new file mode 100644
index 0000000..32a755a
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/signalent.h
@@ -0,0 +1,52 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+/* from linux kernel 5.10 */
+ "SIG_0", /* 0 */
+ "SIGHUP", /* 1 */
+ "SIGINT", /* 2 */
+ "SIGQUIT", /* 3 */
+ "SIGILL", /* 4 */
+ "SIGTRAP", /* 5 */
+ "SIGABRT", /* 6 */
+ "SIGBUS", /* 7 */
+ "SIGFPE", /* 8 */
+ "SIGKILL", /* 9 */
+ "SIGUSR1", /* 10 */
+ "SIGSEGV", /* 11 */
+ "SIGUSR2", /* 12 */
+ "SIGPIPE", /* 13 */
+ "SIGALRM", /* 14 */
+ "SIGTERM", /* 15 */
+ "SIGSTKFLT", /* 16 */
+ "SIGCHLD", /* 17 */
+ "SIGCONT", /* 18 */
+ "SIGSTOP", /* 19 */
+ "SIGTSTP", /* 20 */
+ "SIGTTIN", /* 21 */
+ "SIGTTOU", /* 22 */
+ "SIGURG", /* 23 */
+ "SIGXCPU", /* 24 */
+ "SIGXFSZ", /* 25 */
+ "SIGVTALRM", /* 26 */
+ "SIGPROF", /* 27 */
+ "SIGWINCH", /* 28 */
+ "SIGIO", /* 29 */
+ "SIGPWR", /* 30 */
+ "SIGSYS", /* 31 */
diff --git a/sysdeps/linux-gnu/riscv64/syscallent.h b/sysdeps/linux-gnu/riscv64/syscallent.h
new file mode 100644
index 0000000..e4fba7f
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/syscallent.h
@@ -0,0 +1,461 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+/* from linux kernel 5.10 */
+ "io_setup", /* 0 */
+ "io_destroy", /* 1 */
+ "io_submit", /* 2 */
+ "io_cancel", /* 3 */
+ "io_getevents", /* 4 */
+ "setxattr", /* 5 */
+ "lsetxattr", /* 6 */
+ "fsetxattr", /* 7 */
+ "getxattr", /* 8 */
+ "lgetxattr", /* 9 */
+ "fgetxattr", /* 10 */
+ "listxattr", /* 11 */
+ "llistxattr", /* 12 */
+ "flistxattr", /* 13 */
+ "removexattr", /* 14 */
+ "lremovexattr", /* 15 */
+ "fremovexattr", /* 16 */
+ "getcwd", /* 17 */
+ "lookup_dcookie", /* 18 */
+ "eventfd2", /* 19 */
+ "epoll_create1", /* 20 */
+ "epoll_ctl", /* 21 */
+ "epoll_pwait", /* 22 */
+ "dup", /* 23 */
+ "dup3", /* 24 */
+ "fcntl", /* 25 */
+ "inotify_init1", /* 26 */
+ "inotify_add_watch", /* 27 */
+ "inotify_rm_watch", /* 28 */
+ "ioctl", /* 29 */
+ "ioprio_set", /* 30 */
+ "ioprio_get", /* 31 */
+ "flock", /* 32 */
+ "mknodat", /* 33 */
+ "mkdirat", /* 34 */
+ "unlinkat", /* 35 */
+ "symlinkat", /* 36 */
+ "linkat", /* 37 */
+ "renameat", /* 38 */
+ "umount2", /* 39 */
+ "mount", /* 40 */
+ "pivot_root", /* 41 */
+ "nfsservctl", /* 42 */
+ "statfs", /* 43 */
+ "fstatfs", /* 44 */
+ "truncate", /* 45 */
+ "ftruncate", /* 46 */
+ "fallocate", /* 47 */
+ "faccessat", /* 48 */
+ "chdir", /* 49 */
+ "fchdir", /* 50 */
+ "chroot", /* 51 */
+ "fchmod", /* 52 */
+ "fchmodat", /* 53 */
+ "fchownat", /* 54 */
+ "fchown", /* 55 */
+ "openat", /* 56 */
+ "close", /* 57 */
+ "vhangup", /* 58 */
+ "pipe2", /* 59 */
+ "quotactl", /* 60 */
+ "getdents64", /* 61 */
+ "lseek", /* 62 */
+ "read", /* 63 */
+ "write", /* 64 */
+ "readv", /* 65 */
+ "writev", /* 66 */
+ "pread64", /* 67 */
+ "pwrite64", /* 68 */
+ "preadv", /* 69 */
+ "pwritev", /* 70 */
+ "sendfile", /* 71 */
+ "pselect6", /* 72 */
+ "ppoll", /* 73 */
+ "signalfd4", /* 74 */
+ "vmsplice", /* 75 */
+ "splice", /* 76 */
+ "tee", /* 77 */
+ "readlinkat", /* 78 */
+ "fstatat", /* 79 */
+ "fstat", /* 80 */
+ "sync", /* 81 */
+ "fsync", /* 82 */
+ "fdatasync", /* 83 */
+ "sync_file_range", /* 84 */
+ "timerfd_create", /* 85 */
+ "timerfd_settime", /* 86 */
+ "timerfd_gettime", /* 87 */
+ "utimensat", /* 88 */
+ "acct", /* 89 */
+ "capget", /* 90 */
+ "capset", /* 91 */
+ "personality", /* 92 */
+ "exit", /* 93 */
+ "exit_group", /* 94 */
+ "waitid", /* 95 */
+ "set_tid_address", /* 96 */
+ "unshare", /* 97 */
+ "futex", /* 98 */
+ "set_robust_list", /* 99 */
+ "get_robust_list", /* 100 */
+ "nanosleep", /* 101 */
+ "getitimer", /* 102 */
+ "setitimer", /* 103 */
+ "kexec_load", /* 104 */
+ "init_module", /* 105 */
+ "delete_module", /* 106 */
+ "timer_create", /* 107 */
+ "timer_gettime", /* 108 */
+ "timer_getoverrun", /* 109 */
+ "timer_settime", /* 110 */
+ "timer_delete", /* 111 */
+ "clock_settime", /* 112 */
+ "clock_gettime", /* 113 */
+ "clock_getres", /* 114 */
+ "clock_nanosleep", /* 115 */
+ "syslog", /* 116 */
+ "ptrace", /* 117 */
+ "sched_setparam", /* 118 */
+ "sched_setscheduler", /* 119 */
+ "sched_getscheduler", /* 120 */
+ "sched_getparam", /* 121 */
+ "sched_setaffinity", /* 122 */
+ "sched_getaffinity", /* 123 */
+ "sched_yield", /* 124 */
+ "sched_get_priority_max", /* 125 */
+ "sched_get_priority_min", /* 126 */
+ "sched_rr_get_interval", /* 127 */
+ "restart_syscall", /* 128 */
+ "kill", /* 129 */
+ "tkill", /* 130 */
+ "tgkill", /* 131 */
+ "sigaltstack", /* 132 */
+ "rt_sigsuspend", /* 133 */
+ "rt_sigaction", /* 134 */
+ "rt_sigprocmask", /* 135 */
+ "rt_sigpending", /* 136 */
+ "rt_sigtimedwait", /* 137 */
+ "rt_sigqueueinfo", /* 138 */
+ "rt_sigreturn", /* 139 */
+ "setpriority", /* 140 */
+ "getpriority", /* 141 */
+ "reboot", /* 142 */
+ "setregid", /* 143 */
+ "setgid", /* 144 */
+ "setreuid", /* 145 */
+ "setuid", /* 146 */
+ "setresuid", /* 147 */
+ "getresuid", /* 148 */
+ "setresgid", /* 149 */
+ "getresgid", /* 150 */
+ "setfsuid", /* 151 */
+ "setfsgid", /* 152 */
+ "times", /* 153 */
+ "setpgid", /* 154 */
+ "getpgid", /* 155 */
+ "getsid", /* 156 */
+ "setsid", /* 157 */
+ "getgroups", /* 158 */
+ "setgroups", /* 159 */
+ "uname", /* 160 */
+ "sethostname", /* 161 */
+ "setdomainname", /* 162 */
+ "getrlimit", /* 163 */
+ "setrlimit", /* 164 */
+ "getrusage", /* 165 */
+ "umask", /* 166 */
+ "prctl", /* 167 */
+ "getcpu", /* 168 */
+ "gettimeofday", /* 169 */
+ "settimeofday", /* 170 */
+ "adjtimex", /* 171 */
+ "getpid", /* 172 */
+ "getppid", /* 173 */
+ "getuid", /* 174 */
+ "geteuid", /* 175 */
+ "getgid", /* 176 */
+ "getegid", /* 177 */
+ "gettid", /* 178 */
+ "sysinfo", /* 179 */
+ "mq_open", /* 180 */
+ "mq_unlink", /* 181 */
+ "mq_timedsend", /* 182 */
+ "mq_timedreceive", /* 183 */
+ "mq_notify", /* 184 */
+ "mq_getsetattr", /* 185 */
+ "msgget", /* 186 */
+ "msgctl", /* 187 */
+ "msgrcv", /* 188 */
+ "msgsnd", /* 189 */
+ "semget", /* 190 */
+ "semctl", /* 191 */
+ "semtimedop", /* 192 */
+ "semop", /* 193 */
+ "shmget", /* 194 */
+ "shmctl", /* 195 */
+ "shmat", /* 196 */
+ "shmdt", /* 197 */
+ "socket", /* 198 */
+ "socketpair", /* 199 */
+ "bind", /* 200 */
+ "listen", /* 201 */
+ "accept", /* 202 */
+ "connect", /* 203 */
+ "getsockname", /* 204 */
+ "getpeername", /* 205 */
+ "sendto", /* 206 */
+ "recvfrom", /* 207 */
+ "setsockopt", /* 208 */
+ "getsockopt", /* 209 */
+ "shutdown", /* 210 */
+ "sendmsg", /* 211 */
+ "recvmsg", /* 212 */
+ "readahead", /* 213 */
+ "brk", /* 214 */
+ "munmap", /* 215 */
+ "mremap", /* 216 */
+ "add_key", /* 217 */
+ "request_key", /* 218 */
+ "keyctl", /* 219 */
+ "clone", /* 220 */
+ "execve", /* 221 */
+ "mmap", /* 222 */
+ "fadvise64", /* 223 */
+ "swapon", /* 224 */
+ "swapoff", /* 225 */
+ "mprotect", /* 226 */
+ "msync", /* 227 */
+ "mlock", /* 228 */
+ "munlock", /* 229 */
+ "mlockall", /* 230 */
+ "munlockall", /* 231 */
+ "mincore", /* 232 */
+ "madvise", /* 233 */
+ "remap_file_pages", /* 234 */
+ "mbind", /* 235 */
+ "get_mempolicy", /* 236 */
+ "set_mempolicy", /* 237 */
+ "migrate_pages", /* 238 */
+ "move_pages", /* 239 */
+ "rt_tgsigqueueinfo", /* 240 */
+ "perf_event_open", /* 241 */
+ "accept4", /* 242 */
+ "recvmmsg", /* 243 */
+ "244",
+ "245",
+ "246",
+ "247",
+ "248",
+ "249",
+ "250",
+ "251",
+ "252",
+ "253",
+ "254",
+ "255",
+ "256",
+ "257",
+ "258",
+ "riscv_flush_icache", /* 259 */
+ "wait4", /* 260 */
+ "prlimit64", /* 261 */
+ "fanotify_init", /* 262 */
+ "fanotify_mark", /* 263 */
+ "name_to_handle_at", /* 264 */
+ "open_by_handle_at", /* 265 */
+ "clock_adjtime", /* 266 */
+ "syncfs", /* 267 */
+ "setns", /* 268 */
+ "sendmmsg", /* 269 */
+ "process_vm_readv", /* 270 */
+ "process_vm_writev", /* 271 */
+ "kcmp", /* 272 */
+ "finit_module", /* 273 */
+ "sched_setattr", /* 274 */
+ "sched_getattr", /* 275 */
+ "renameat2", /* 276 */
+ "seccomp", /* 277 */
+ "getrandom", /* 278 */
+ "memfd_create", /* 279 */
+ "bpf", /* 280 */
+ "execveat", /* 281 */
+ "userfaultfd", /* 282 */
+ "membarrier", /* 283 */
+ "mlock2", /* 284 */
+ "copy_file_range", /* 285 */
+ "preadv2", /* 286 */
+ "pwritev2", /* 287 */
+ "pkey_mprotect", /* 288 */
+ "pkey_alloc", /* 289 */
+ "pkey_free", /* 290 */
+ "statx", /* 291 */
+ "io_pgetevents", /* 292 */
+ "rseq", /* 293 */
+ "kexec_file_load", /* 294 */
+ "295",
+ "296",
+ "297",
+ "298",
+ "299",
+ "300",
+ "301",
+ "302",
+ "303",
+ "304",
+ "305",
+ "306",
+ "307",
+ "308",
+ "309",
+ "310",
+ "311",
+ "312",
+ "313",
+ "314",
+ "315",
+ "316",
+ "317",
+ "318",
+ "319",
+ "320",
+ "321",
+ "322",
+ "323",
+ "324",
+ "325",
+ "326",
+ "327",
+ "328",
+ "329",
+ "330",
+ "331",
+ "332",
+ "333",
+ "334",
+ "335",
+ "336",
+ "337",
+ "338",
+ "339",
+ "340",
+ "341",
+ "342",
+ "343",
+ "344",
+ "345",
+ "346",
+ "347",
+ "348",
+ "349",
+ "350",
+ "351",
+ "352",
+ "353",
+ "354",
+ "355",
+ "356",
+ "357",
+ "358",
+ "359",
+ "360",
+ "361",
+ "362",
+ "363",
+ "364",
+ "365",
+ "366",
+ "367",
+ "368",
+ "369",
+ "370",
+ "371",
+ "372",
+ "373",
+ "374",
+ "375",
+ "376",
+ "377",
+ "378",
+ "379",
+ "380",
+ "381",
+ "382",
+ "383",
+ "384",
+ "385",
+ "386",
+ "387",
+ "388",
+ "389",
+ "390",
+ "391",
+ "392",
+ "393",
+ "394",
+ "395",
+ "396",
+ "397",
+ "398",
+ "399",
+ "400",
+ "401",
+ "402",
+ "clock_gettime64", /* 403 */
+ "clock_settime64", /* 404 */
+ "clock_adjtime64", /* 405 */
+ "clock_getres_time64", /* 406 */
+ "clock_nanosleep_time64", /* 407 */
+ "timer_gettime64", /* 408 */
+ "timer_settime64", /* 409 */
+ "timerfd_gettime64", /* 410 */
+ "timerfd_settime64", /* 411 */
+ "utimensat_time64", /* 412 */
+ "pselect6_time64", /* 413 */
+ "ppoll_time64", /* 414 */
+ "415",
+ "io_pgetevents_time64", /* 416 */
+ "recvmmsg_time64", /* 417 */
+ "mq_timedsend_time64", /* 418 */
+ "mq_timedreceive_time64", /* 419 */
+ "semtimedop_time64", /* 420 */
+ "rt_sigtimedwait_time64", /* 421 */
+ "futex_time64", /* 422 */
+ "sched_rr_get_interval_time64", /* 423 */
+ "pidfd_send_signal", /* 424 */
+ "io_uring_setup", /* 425 */
+ "io_uring_enter", /* 426 */
+ "io_uring_register", /* 427 */
+ "open_tree", /* 428 */
+ "move_mount", /* 429 */
+ "fsopen", /* 430 */
+ "fsconfig", /* 431 */
+ "fsmount", /* 432 */
+ "fspick", /* 433 */
+ "pidfd_open", /* 434 */
+ "clone3", /* 435 */
+ "close_range", /* 436 */
+ "openat2", /* 437 */
+ "pidfd_getfd", /* 438 */
+ "faccessat2", /* 439 */
+ "process_madvise", /* 440 */
diff --git a/sysdeps/linux-gnu/riscv64/trace.c b/sysdeps/linux-gnu/riscv64/trace.c
new file mode 100644
index 0000000..0a861f2
--- /dev/null
+++ b/sysdeps/linux-gnu/riscv64/trace.c
@@ -0,0 +1,79 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2022 Kai Zhang (laokz)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <sys/wait.h>
+#include "backend.h"
+#include "proc.h"
+#include "ptrace.h"
+
+extern long
+riscv64_read_gregs(struct process *proc, struct user_regs_struct *regs);
+
+void
+get_arch_dep(struct process *proc)
+{
+}
+
+int
+syscall_p(struct process *proc, int status, int *sysnum)
+{
+ if (WIFSTOPPED(status)
+ && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
+
+ struct user_regs_struct regs;
+ if (riscv64_read_gregs(proc, ®s) == -1)
+ return -1;
+
+ /* ecall has no compressed format */
+ switch (ptrace(PTRACE_PEEKTEXT, proc->pid, regs.pc - 4, 0) &
+ 0xFFFFFFFF) {
+ case 0x73:
+ break;
+ case -1:
+ perror("PTRACE_PEEKTEXT");
+ return -1;
+ default:
+ return 0;
+ }
+
+ *sysnum = regs.a7;
+ size_t i = proc->callstack_depth - 1;
+ if (proc->callstack_depth > 0
+ && proc->callstack[i].is_syscall
+ && proc->callstack[i].c_un.syscall == (int)regs.a7) {
+ return 2;
+ }
+ return 1;
+ }
+ return 0;
+}
+
+/* how to deal with this logic?? lr/sc atomic pairs?? */
+enum sw_singlestep_status arch_sw_singlestep(struct process *proc,
+ struct breakpoint *bp,
+ int (*add_cb)(arch_addr_t addr,
+ struct sw_singlestep_data *),
+ struct sw_singlestep_data *data)
+{
+ if (!ptrace(PTRACE_SYSCALL, proc->pid, 0, 0))
+ return SWS_OK;
+ return SWS_FAIL;
+}
--
2.40.1
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