[{"id":3674386,"web_url":"http://patchwork.ozlabs.org/comment/3674386/","msgid":"<9ae5a77f-38a4-4067-9a16-9493774158fb@oss.qualcomm.com>","list_archive_url":null,"date":"2026-04-07T09:38:50","subject":"Re: [PATCH 2/5] linux-user/strace: Add a wrapper for read and write","submitter":{"id":92288,"url":"http://patchwork.ozlabs.org/api/people/92288/","name":"Daniel Henrique Barboza","email":"daniel.barboza@oss.qualcomm.com"},"content":"On 4/7/2026 1:36 AM, alistair23@gmail.com wrote:\n> From: Alistair Francis \n> \n> The stack pointer is being truncated as 32-bits for qemu-riscv64, so\n> let's add a print_read_write helper that ensures all of the bits are\n> printed.\n> \n> Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3238\n> Signed-off-by: Alistair Francis \n> ---\n\n\nReviewed-by: Daniel Henrique Barboza \n\n\n> linux-user/strace.c | 14 ++++++++++++++\n> linux-user/strace.list | 4 ++--\n> 2 files changed, 16 insertions(+), 2 deletions(-)\n> \n> diff --git a/linux-user/strace.c b/linux-user/strace.c\n> index 2cbaf94c89..023173857b 100644\n> --- a/linux-user/strace.c\n> +++ b/linux-user/strace.c\n> @@ -4309,6 +4309,20 @@ print_tgkill(CPUArchState *cpu_env, const struct syscallname *name,\n> }\n> #endif\n> \n> +#if defined(TARGET_NR_read) || defined(TARGET_NR_write)\n> +static void\n> +print_read_write(CPUArchState *cpu_env, const struct syscallname *name,\n> + abi_long arg0, abi_long arg1, abi_long arg2,\n> + abi_long arg3, abi_long arg4, abi_long arg5)\n> +{\n> + print_syscall_prologue(name);\n> + print_raw_param(\"%d\", arg0, 0);\n> + print_pointer(arg1, 0);\n> + print_raw_param(\"%d\", arg2, 1);\n> + print_syscall_epilogue(name);\n> +}\n> +#endif\n> +\n> #if defined(TARGET_NR_pread64) || defined(TARGET_NR_pwrite64)\n> static void\n> print_pread64(CPUArchState *cpu_env, const struct syscallname *name,\n> diff --git a/linux-user/strace.list b/linux-user/strace.list\n> index 35f001fecd..239b9e18b4 100644\n> --- a/linux-user/strace.list\n> +++ b/linux-user/strace.list\n> @@ -1114,7 +1114,7 @@\n> { TARGET_NR_quotactl, \"quotactl\" , NULL, NULL, NULL },\n> #endif\n> #ifdef TARGET_NR_read\n> -{ TARGET_NR_read, \"read\" , \"%s(%d,%#x,%d)\", NULL, NULL },\n> +{ TARGET_NR_read, \"read\" , NULL, print_read_write, NULL },\n> #endif\n> #ifdef TARGET_NR_readahead\n> { TARGET_NR_readahead, \"readahead\" , NULL, NULL, NULL },\n> @@ -1674,7 +1674,7 @@\n> print_syscall_ret_waitpid },\n> #endif\n> #ifdef TARGET_NR_write\n> -{ TARGET_NR_write, \"write\" , \"%s(%d,%#x,%d)\", NULL, NULL },\n> +{ TARGET_NR_write, \"write\" , NULL, print_read_write, NULL },\n> #endif\n> #ifdef TARGET_NR_writev\n> { TARGET_NR_writev, \"writev\" , \"%s(%d,%p,%#x)\", NULL, NULL },","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=QjgoTHXN;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=QDN3aaEN;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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We can use\nTARGET_ABI_FMT_ld to replace it.\n\nOtherwise LGTM.\n\nReviewed-by: Chao Liu \n\nThanks,\nChao\n> + print_syscall_epilogue(name);\n> +}\n> +#endif\n> +\n> #if defined(TARGET_NR_pread64) || defined(TARGET_NR_pwrite64)\n> static void\n> print_pread64(CPUArchState *cpu_env, const struct syscallname *name,\n> diff --git a/linux-user/strace.list b/linux-user/strace.list\n> index 35f001fecd..239b9e18b4 100644\n> --- a/linux-user/strace.list\n> +++ b/linux-user/strace.list\n> @@ -1114,7 +1114,7 @@\n> { TARGET_NR_quotactl, \"quotactl\" , NULL, NULL, NULL },\n> #endif\n> #ifdef TARGET_NR_read\n> -{ TARGET_NR_read, \"read\" , \"%s(%d,%#x,%d)\", NULL, NULL },\n> +{ TARGET_NR_read, \"read\" , NULL, print_read_write, NULL },\n> #endif\n> #ifdef TARGET_NR_readahead\n> { TARGET_NR_readahead, \"readahead\" , NULL, NULL, NULL },\n> @@ -1674,7 +1674,7 @@\n> print_syscall_ret_waitpid },\n> #endif\n> #ifdef TARGET_NR_write\n> -{ TARGET_NR_write, \"write\" , \"%s(%d,%#x,%d)\", NULL, NULL },\n> +{ TARGET_NR_write, \"write\" , NULL, print_read_write, NULL },\n> #endif\n> #ifdef TARGET_NR_writev\n> { TARGET_NR_writev, \"writev\" , \"%s(%d,%p,%#x)\", NULL, NULL },\n> -- \n> 2.53.0\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=p1bdEmJE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260407043614.372871-3-alistair.francis@wdc.com>","Received-SPF":"pass client-ip=2607:f8b0:4864:20::844;\n envelope-from=chao.liu.zevorn@gmail.com; helo=mail-qt1-x844.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3674932,"web_url":"http://patchwork.ozlabs.org/comment/3674932/","msgid":"<9846560e-9074-419d-9d06-9b949f6372ce@linaro.org>","list_archive_url":null,"date":"2026-04-08T08:37:49","subject":"Re: [PATCH 2/5] linux-user/strace: Add a wrapper for read and write","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 7/4/26 18:55, Chao Liu wrote:\n> On Tue, Apr 07, 2026 at 02:36:11PM +1000, alistair23@gmail.com wrote:\n>> From: Alistair Francis \n>>\n>> The stack pointer is being truncated as 32-bits for qemu-riscv64, so\n>> let's add a print_read_write helper that ensures all of the bits are\n>> printed.\n>>\n>> Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3238\n>> Signed-off-by: Alistair Francis \n>> ---\n>> linux-user/strace.c | 14 ++++++++++++++\n>> linux-user/strace.list | 4 ++--\n>> 2 files changed, 16 insertions(+), 2 deletions(-)\n\n\n>> +#if defined(TARGET_NR_read) || defined(TARGET_NR_write)\n>> +static void\n>> +print_read_write(CPUArchState *cpu_env, const struct syscallname *name,\n>> + abi_long arg0, abi_long arg1, abi_long arg2,\n>> + abi_long arg3, abi_long arg4, abi_long arg5)\n>> +{\n>> + print_syscall_prologue(name);\n>> + print_raw_param(\"%d\", arg0, 0);\n>> + print_pointer(arg1, 0);\n>> + print_raw_param(\"%d\", arg2, 1);\n> If TARGET_NR_read and TARGET_NR_write support 64-bit targets,\n> abi_long is int64_t, so %d will be truncated. We can use\n> TARGET_ABI_FMT_ld to replace it.\n\nWith the 2 \"%d\" replacements to TARGET_ABI_FMT_ld:\nReviewed-by: Philippe Mathieu-Daudé \n\n> \n> Otherwise LGTM.\n> \n> Reviewed-by: Chao Liu \n> \n> Thanks,\n> Chao\n>> + print_syscall_epilogue(name);\n>> +}\n>> +#endif","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=IwVLNYb8;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4frXxQ4y15z1xv0\n\tfor ; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::331;\n envelope-from=philmd@linaro.org; helo=mail-wm1-x331.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3674971,"web_url":"http://patchwork.ozlabs.org/comment/3674971/","msgid":"<91744ff3-df7c-46e5-b2a1-cd7f49051723@linaro.org>","list_archive_url":null,"date":"2026-04-08T01:40:20","subject":"Re: [PATCH 2/5] linux-user/strace: Add a wrapper for read and write","submitter":{"id":72104,"url":"http://patchwork.ozlabs.org/api/people/72104/","name":"Richard Henderson","email":"richard.henderson@linaro.org"},"content":"On 4/7/26 14:36, alistair23@gmail.com wrote:\n> From: Alistair Francis \n> \n> The stack pointer is being truncated as 32-bits for qemu-riscv64, so\n> let's add a print_read_write helper that ensures all of the bits are\n> printed.\n> \n> Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3238\n> Signed-off-by: Alistair Francis \n> ---\n> linux-user/strace.c | 14 ++++++++++++++\n> linux-user/strace.list | 4 ++--\n> 2 files changed, 16 insertions(+), 2 deletions(-)\n\nThis is indicative of incorrect fowarding of values to system fprintf.\nWe really should be handling the format ourselves so abi_long etc are handled properly.\n\nIn particular,\n\n> +print_read_write(CPUArchState *cpu_env, const struct syscallname *name,\n> + abi_long arg0, abi_long arg1, abi_long arg2,\n> + abi_long arg3, abi_long arg4, abi_long arg5)\n> +{\n> + print_syscall_prologue(name);\n> + print_raw_param(\"%d\", arg0, 0);\n> + print_pointer(arg1, 0);\n> + print_raw_param(\"%d\", arg2, 1);\n> + print_syscall_epilogue(name);\n> +}\n> +#endif\n\nThis is more work than we should require for such simple syscalls.\n\n> #ifdef TARGET_NR_read\n> -{ TARGET_NR_read, \"read\" , \"%s(%d,%#x,%d)\", NULL, NULL },\n> +{ TARGET_NR_read, \"read\" , NULL, print_read_write, NULL },\n\nIdeally, I think %p is the correct format to use for a syscall pointer argument. \nInterpreted, of course, in the context of abi_ptr.\n\n\nr~","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=HfEKLx8u;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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