app-misc/reptyr: add riscv64 support

Patch is already done upstream, drop on next version bump.

Signed-off-by: Raymond Wong <infiwang@pm.me>
Signed-off-by: Jakov Smolić <jsmolic@gentoo.org>

2 files changed, 120 insertions, 0 deletions

diff --git a/app-misc/reptyr/files/reptyr-0.8.0-riscv64-support.patch b/app-misc/reptyr/files/reptyr-0.8.0-riscv64-support.patch
new file mode 100644
index 000000000000..6cedd3a55c5d
--- /dev/null
+++ b/app-misc/reptyr/files/reptyr-0.8.0-riscv64-support.patch
@@ -0,0 +1,115 @@
+Taken from https://github.com/nelhage/reptyr/commit/e26724cc1ae5fe7af0c9fb6369f6cf09d1d12900
+
+From ae0b4ec014c1a01b1c3409e5404cf0fa0102c349 Mon Sep 17 00:00:00 2001
+From: Ast-x64 <Ast-x64@protonmail.com>
+Date: Wed, 10 Nov 2021 09:39:45 +0800
+Subject: [PATCH] Support riscv64 on Linux.
+
+---
+ platform/linux/arch/riscv64.h | 68 +++++++++++++++++++++++++++++++++++
+ platform/linux/linux_ptrace.c |  2 ++
+ ptrace.h                      |  3 ++
+ 3 files changed, 73 insertions(+)
+ create mode 100644 platform/linux/arch/riscv64.h
+
+diff --git a/platform/linux/arch/riscv64.h b/platform/linux/arch/riscv64.h
+new file mode 100644
+index 0000000..96221c3
+--- /dev/null
++++ b/platform/linux/arch/riscv64.h
+@@ -0,0 +1,68 @@
++/*
++ * Copyright (C) 2021 by Ast-x64
++ *
++ * Permission is hereby granted, free of charge, to any person obtaining a copy
++ * of this software and associated documentation files (the "Software"), to deal
++ * in the Software without restriction, including without limitation the rights
++ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
++ * copies of the Software, and to permit persons to whom the Software is
++ * furnished to do so, subject to the following conditions:
++ *
++ * The above copyright notice and this permission notice shall be included in
++ * all copies or substantial portions of the Software.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
++ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
++ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
++ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
++ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
++ * THE SOFTWARE.
++ */
++static struct ptrace_personality arch_personality[1] = {
++    {
++        offsetof(struct user_regs_struct, a0),
++        offsetof(struct user_regs_struct, a0),
++        offsetof(struct user_regs_struct, a1),
++        offsetof(struct user_regs_struct, a2),
++        offsetof(struct user_regs_struct, a3),
++        offsetof(struct user_regs_struct, a4),
++        offsetof(struct user_regs_struct, a5),
++        offsetof(struct user_regs_struct, pc),
++    }
++};
++
++static inline void arch_fixup_regs(struct ptrace_child *child) {
++    child->regs.pc -= 4;
++}
++
++static inline int arch_set_syscall(struct ptrace_child *child,
++                                   unsigned long sysno) {
++    unsigned long x_reg[18];
++    struct iovec reg_iovec = {
++        .iov_base = x_reg,
++        .iov_len = sizeof(x_reg)
++    };
++    if (ptrace_command(child, PTRACE_GETREGSET, NT_PRSTATUS, &reg_iovec) < 0)
++        return -1;
++
++    x_reg[17] = sysno;
++    return ptrace_command(child, PTRACE_SETREGSET, NT_PRSTATUS, &reg_iovec);
++}
++
++static inline int arch_save_syscall(struct ptrace_child *child) {
++    unsigned long x_reg[18];
++    struct iovec reg_iovec = {
++        .iov_base = x_reg,
++        .iov_len = sizeof(x_reg)
++    };
++    if (ptrace_command(child, PTRACE_GETREGSET, NT_PRSTATUS, &reg_iovec) < 0)
++        return -1;
++
++    child->saved_syscall = x_reg[17];
++    return 0;
++}
++
++static inline int arch_restore_syscall(struct ptrace_child *child) {
++    return arch_set_syscall(child, child->saved_syscall);
++}
+diff --git a/platform/linux/linux_ptrace.c b/platform/linux/linux_ptrace.c
+index d065199..bcbe600 100644
+--- a/platform/linux/linux_ptrace.c
++++ b/platform/linux/linux_ptrace.c
+@@ -84,6 +84,8 @@ static struct ptrace_personality *personality(struct ptrace_child *child);
+ #include "arch/aarch64.h"
+ #elif defined(__powerpc__)
+ #include "arch/powerpc.h"
++#elif defined(__riscv) && __riscv_xlen == 64
++#include "arch/riscv64.h"
+ #else
+ #error Unsupported architecture.
+ #endif
+diff --git a/ptrace.h b/ptrace.h
+index ee05bd7..8e3a7f4 100644
+--- a/ptrace.h
++++ b/ptrace.h
+@@ -25,6 +25,9 @@
+ #ifdef __powerpc__
+ #include <asm/ptrace.h>
+ #endif
++#ifdef __riscv
++#include <asm/ptrace.h>
++#endif
+ #include <sys/ptrace.h>
+ #include <sys/types.h>
+ #include <sys/user.h>
diff --git a/app-misc/reptyr/reptyr-0.8.0.ebuild b/app-misc/reptyr/reptyr-0.8.0.ebuild
index 960ac099ad2a..012379e3b3ed 100644
--- a/app-misc/reptyr/reptyr-0.8.0.ebuild
+++ b/app-misc/reptyr/reptyr-0.8.0.ebuild
@@ -15,6 +15,11 @@ KEYWORDS="amd64 ~arm ~arm64 ~ppc64 x86 ~amd64-linux ~x86-linux"
 
 RESTRICT="test"
 
+PATCHES=(
+	# drop on next version bump
+	"${FILESDIR}"/${PN}-0.8.0-riscv64-support.patch
+)
+
 src_prepare() {
 	default
 	# respect CFLAGS