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Message-ID: <170668568429.398.15938527220341283566.tip-bot2@tip-bot2>
Date: Wed, 31 Jan 2024 07:21:24 -0000
From: "tip-bot2 for Xin Li" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin (Intel)" <hpa@...or.com>, Xin Li <xin3.li@...el.com>,
Shan Kang <shan.kang@...el.com>, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/fred] x86/ptrace: Add FRED additional information to the
pt_regs structure
The following commit has been merged into the x86/fred branch of tip:
Commit-ID: c125443456e97f7bcc87cc7ba1346c2b92c4db94
Gitweb: https://git.kernel.org/tip/c125443456e97f7bcc87cc7ba1346c2b92c4db94
Author: Xin Li <xin3.li@...el.com>
AuthorDate: Tue, 05 Dec 2023 02:50:03 -08:00
Committer: Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Tue, 30 Jan 2024 18:20:34 +01:00
x86/ptrace: Add FRED additional information to the pt_regs structure
FRED defines additional information in the upper 48 bits of cs/ss
fields. Therefore add the information definitions into the pt_regs
structure.
Specifically introduce a new structure fred_ss to denote the FRED flags
above SS selector, which avoids FRED_SSX_ macros and makes the code
simpler and easier to read.
Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Originally-by: H. Peter Anvin (Intel) <hpa@...or.com>
Signed-off-by: Xin Li <xin3.li@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Shan Kang <shan.kang@...el.com>
Link: https://lore.kernel.org/r/20231205105030.8698-15-xin3.li@intel.com
---
arch/x86/include/asm/ptrace.h | 66 +++++++++++++++++++++++++++++++---
1 file changed, 61 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index b268cd2..5a83fbd 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -56,6 +56,50 @@ struct pt_regs {
#else /* __i386__ */
+struct fred_cs {
+ /* CS selector */
+ u64 cs : 16,
+ /* Stack level at event time */
+ sl : 2,
+ /* IBT in WAIT_FOR_ENDBRANCH state */
+ wfe : 1,
+ : 45;
+};
+
+struct fred_ss {
+ /* SS selector */
+ u64 ss : 16,
+ /* STI state */
+ sti : 1,
+ /* Set if syscall, sysenter or INT n */
+ swevent : 1,
+ /* Event is NMI type */
+ nmi : 1,
+ : 13,
+ /* Event vector */
+ vector : 8,
+ : 8,
+ /* Event type */
+ type : 4,
+ : 4,
+ /* Event was incident to enclave execution */
+ enclave : 1,
+ /* CPU was in long mode */
+ lm : 1,
+ /*
+ * Nested exception during FRED delivery, not set
+ * for #DF.
+ */
+ nested : 1,
+ : 1,
+ /*
+ * The length of the instruction causing the event.
+ * Only set for INTO, INT1, INT3, INT n, SYSCALL
+ * and SYSENTER. 0 otherwise.
+ */
+ insnlen : 4;
+};
+
struct pt_regs {
/*
* C ABI says these regs are callee-preserved. They aren't saved on
@@ -85,6 +129,12 @@ struct pt_regs {
* - the syscall number (syscall, sysenter, int80)
* - error_code stored by the CPU on traps and exceptions
* - the interrupt number for device interrupts
+ *
+ * A FRED stack frame starts here:
+ * 1) It _always_ includes an error code;
+ *
+ * 2) The return frame for ERET[US] starts here, but
+ * the content of orig_ax is ignored.
*/
unsigned long orig_ax;
@@ -92,24 +142,30 @@ struct pt_regs {
unsigned long ip;
union {
- /* The full 64-bit data slot containing CS */
- u64 csx;
/* CS selector */
u16 cs;
+ /* The extended 64-bit data slot containing CS */
+ u64 csx;
+ /* The FRED CS extension */
+ struct fred_cs fred_cs;
};
unsigned long flags;
unsigned long sp;
union {
- /* The full 64-bit data slot containing SS */
- u64 ssx;
/* SS selector */
u16 ss;
+ /* The extended 64-bit data slot containing SS */
+ u64 ssx;
+ /* The FRED SS extension */
+ struct fred_ss fred_ss;
};
/*
- * Top of stack on IDT systems.
+ * Top of stack on IDT systems, while FRED systems have extra fields
+ * defined above for storing exception related information, e.g. CR2 or
+ * DR6.
*/
};
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