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Mon, 27 Apr 2026 05:29:00 -0700 (PDT) From: "Mukesh Kumar Chaurasiya (IBM)" To: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, oleg@redhat.com, kees@kernel.org, luto@amacapital.net, wad@chromium.org, mchauras@linux.ibm.com, sshegde@linux.ibm.com, thuth@redhat.com, ruanjinjie@huawei.com, akpm@linux-foundation.org, macro@orcam.me.uk, ldv@strace.io, charlie@rivosinc.com, deller@gmx.de, kevin.brodsky@arm.com, ritesh.list@gmail.com, yeoreum.yun@arm.com, agordeev@linux.ibm.com, segher@kernel.crashing.org, mark.rutland@arm.com, ryan.roberts@arm.com, pmladek@suse.com, feng.tang@linux.alibaba.com, peterz@infradead.org, kan.liang@linux.intel.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Cc: Samir M , David Gow , Venkat Rao Bagalkote Subject: [PATCH v5 5/8] powerpc: add exit_flags field in pt_regs Date: Mon, 27 Apr 2026 17:57:39 +0530 Message-ID: <20260427122742.210074-6-mkchauras@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260427122742.210074-1-mkchauras@gmail.com> References: <20260427122742.210074-1-mkchauras@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Mukesh Kumar Chaurasiya Add a new field `exit_flags` in the pt_regs structure. This field will hold the flags set during interrupt or syscall execution that are required during exit to user mode. Specifically, the `TIF_RESTOREALL` flag, stored in this field, helps the exit routine determine if any NVGPRs were modified and need to be restored before returning to userspace. This addition ensures a clean and architecture-specific mechanism to track per-syscall or per-interrupt state transitions related to register restore. Changes: - Add `exit_flags` and `__pt_regs_pad` to maintain 16-byte stack alignment - Update asm-offsets.c and ptrace.c for offset and validation - Update PT_* constants in uapi header to reflect the new layout Signed-off-by: Mukesh Kumar Chaurasiya Tested-by: Samir M Tested-by: David Gow Tested-by: Venkat Rao Bagalkote Reviewed-by: Shrikanth Hegde --- arch/powerpc/include/asm/ptrace.h | 3 +++ arch/powerpc/include/uapi/asm/ptrace.h | 14 +++++++++----- arch/powerpc/kernel/ptrace/ptrace.c | 1 + 3 files changed, 13 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h index 94aa1de2b06e..2e741ea57b80 100644 --- a/arch/powerpc/include/asm/ptrace.h +++ b/arch/powerpc/include/asm/ptrace.h @@ -53,6 +53,9 @@ struct pt_regs unsigned long esr; }; unsigned long result; + unsigned long exit_flags; + /* Maintain 16 byte interrupt stack alignment */ + unsigned long __pt_regs_pad[3]; }; }; #if defined(CONFIG_PPC64) || defined(CONFIG_PPC_KUAP) diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h index 01e630149d48..a393b7f2760a 100644 --- a/arch/powerpc/include/uapi/asm/ptrace.h +++ b/arch/powerpc/include/uapi/asm/ptrace.h @@ -55,6 +55,8 @@ struct pt_regs unsigned long dar; /* Fault registers */ unsigned long dsisr; /* on 4xx/Book-E used for ESR */ unsigned long result; /* Result of a system call */ + unsigned long exit_flags; /* System call exit flags */ + unsigned long __pt_regs_pad[3]; /* Maintain 16 byte interrupt stack alignment */ }; #endif /* __ASSEMBLER__ */ @@ -114,10 +116,12 @@ struct pt_regs #define PT_DAR 41 #define PT_DSISR 42 #define PT_RESULT 43 -#define PT_DSCR 44 -#define PT_REGS_COUNT 44 +#define PT_EXIT_FLAGS 44 +#define PT_PAD 47 /* 3 times */ +#define PT_DSCR 48 +#define PT_REGS_COUNT 48 -#define PT_FPR0 48 /* each FP reg occupies 2 slots in this space */ +#define PT_FPR0 (PT_REGS_COUNT + 4) /* each FP reg occupies 2 slots in this space */ #ifndef __powerpc64__ @@ -129,7 +133,7 @@ struct pt_regs #define PT_FPSCR (PT_FPR0 + 32) /* each FP reg occupies 1 slot in 64-bit space */ -#define PT_VR0 82 /* each Vector reg occupies 2 slots in 64-bit */ +#define PT_VR0 (PT_FPSCR + 2) /* <82> each Vector reg occupies 2 slots in 64-bit */ #define PT_VSCR (PT_VR0 + 32*2 + 1) #define PT_VRSAVE (PT_VR0 + 33*2) @@ -137,7 +141,7 @@ struct pt_regs /* * Only store first 32 VSRs here. The second 32 VSRs in VR0-31 */ -#define PT_VSR0 150 /* each VSR reg occupies 2 slots in 64-bit */ +#define PT_VSR0 (PT_VRSAVE + 2) /* each VSR reg occupies 2 slots in 64-bit */ #define PT_VSR31 (PT_VSR0 + 2*31) #endif /* __powerpc64__ */ diff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c index c6997df63287..2134b6d155ff 100644 --- a/arch/powerpc/kernel/ptrace/ptrace.c +++ b/arch/powerpc/kernel/ptrace/ptrace.c @@ -432,6 +432,7 @@ void __init pt_regs_check(void) CHECK_REG(PT_DAR, dar); CHECK_REG(PT_DSISR, dsisr); CHECK_REG(PT_RESULT, result); + CHECK_REG(PT_EXIT_FLAGS, exit_flags); #undef CHECK_REG BUILD_BUG_ON(PT_REGS_COUNT != sizeof(struct user_pt_regs) / sizeof(unsigned long)); -- 2.53.0