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Subject[PATCH V6 42/49] x86/entry: Add a C macro to define the function body for IST in .entry.text with an error code
Date
From: Lai Jiangshan <laijs@linux.alibaba.com>

Add DEFINE_IDTENTRY_IST_ENTRY_ERRORCODE() macro to define C code to
implement the ASM code which calls paranoid_entry(), modify orig_ax,
cfunc(), paranoid_exit() in series for IST exceptions with an error code.

Not functional difference intended.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
---
arch/x86/include/asm/idtentry.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index b65cb61aafdc..46b2ef021992 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -351,6 +351,22 @@ __visible __entry_text void ist_##func(struct pt_regs *regs) \
ist_paranoid_exit(cr3, gsbase); \
}

+/**
+ * DEFINE_IDTENTRY_IST_ENTRY_ERRORCODE - Emit __entry_text code for IST
+ * entry points with an error code
+ * @func: Function name of the entry point
+ */
+#define DEFINE_IDTENTRY_IST_ENTRY_ERRORCODE(func) \
+__visible __entry_text void ist_##func(struct pt_regs *regs) \
+{ \
+ unsigned long cr3, gsbase, error_code = regs->orig_ax; \
+ \
+ ist_paranoid_entry(&cr3, &gsbase); \
+ regs->orig_ax = -1; /* no syscall to restart */ \
+ func(regs, error_code); \
+ ist_paranoid_exit(cr3, gsbase); \
+}
+
/**
* DEFINE_IDTENTRY_IST - Emit code for IST entry points
* @func: Function name of the entry point
--
2.19.1.6.gb485710b
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