On 14.09.23 г. 7:47 ч., Xin Li wrote:
FRED defines additional information in the upper 48 bits of cs/ss
fields. Therefore add the information definitions into the pt_regs
structure.
Specially 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.
Signed-off-by: H. Peter Anvin (Intel)
Tested-by: Shan Kang
Signed-off-by: Thomas Gleixner
Signed-off-by: Xin Li
---
Changes since v9:
* 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 (Thomas Gleixner).
* Use type u64 to define FRED bit fields instead of type unsigned int
(Thomas Gleixner).
Changes since v8:
* Reflect stack frame definition changes from FRED spec 3.0 to 5.0.
* Use __packed instead of __attribute__((__packed__)) (Borislav Petkov).
* Put all comments above the members, like the rest of the file does
(Borislav Petkov).
Changes since v3:
* Rename csl/ssl of the pt_regs structure to csx/ssx (x for extended)
(Andrew Cooper).
---
arch/x86/include/asm/ptrace.h | 51 +++
1 file changed, 46 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index f08ea073edd6..5786c8ca5f4c 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -56,6 +56,25 @@ struct pt_regs {
#else /* __i386__ */
+struct fred_ss {
+ u64 ss : 16, // SS selector
Is this structure conformant to the return state as described in FRED 5.0?
— The stack segment of the interrupted context, 64 bits formatted as follows:
• Bits 15:0 contain the SS selector. < - WE HAVE THIS
• Bits 31:16 are not currently defined and will be zero until they are. < -
MISSING hole?
+ sti : 1, // STI state < -
+ swevent : 1, // Set if syscall, sysenter or INT n
+ nmi : 1, // Event is NMI type
+ : 13,
+ vector : 8, // Event vector
+ : 8,
+ type: 4, // Event type
+ : 4,
+ enclave : 1, // Event was incident to enclave execution
+ lm : 1, // CPU was in long mode
+ nested : 1, // Nested exception during FRED delivery
+ // not set for #DF
+ : 1,
+ insnlen : 4; // The length of the instruction causing the
event
+ // Only set for INT0, INT1, INT3, INT n, SYSCALL
+}; // and SYSENTER. 0 otherwise.
+
