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Subject[PATCH 1/4] kgdb: x86: Return all segment registers also in 64-bit mode
Date
Even if the content is always 0, gdb expects us to return also ds,
es, fs, and gs while in x86-64 mode. Do this to avoid ugly errors on
"info registers".

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
arch/x86/include/asm/kgdb.h | 6 +++++-
arch/x86/kernel/kgdb.c | 6 ++++--
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/kgdb.h b/arch/x86/include/asm/kgdb.h
index 77e95f5..e857f1a 100644
--- a/arch/x86/include/asm/kgdb.h
+++ b/arch/x86/include/asm/kgdb.h
@@ -64,9 +64,13 @@ enum regnames {
GDB_PS, /* 17 */
GDB_CS, /* 18 */
GDB_SS, /* 19 */
+ GDB_DS, /* 20 */
+ GDB_ES, /* 21 */
+ GDB_FS, /* 22 */
+ GDB_GS, /* 23 */
};
#define GDB_ORIG_AX 57
-#define DBG_MAX_REG_NUM 20
+#define DBG_MAX_REG_NUM 24
/* 17 64 bit regs and 3 32 bit regs */
#define NUMREGBYTES ((17 * 8) + (3 * 4))
#endif /* ! CONFIG_X86_32 */
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index faba577..fdc37b3 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -67,8 +67,6 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{ "ss", 4, offsetof(struct pt_regs, ss) },
{ "ds", 4, offsetof(struct pt_regs, ds) },
{ "es", 4, offsetof(struct pt_regs, es) },
- { "fs", 4, -1 },
- { "gs", 4, -1 },
#else
{ "ax", 8, offsetof(struct pt_regs, ax) },
{ "bx", 8, offsetof(struct pt_regs, bx) },
@@ -90,7 +88,11 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{ "flags", 4, offsetof(struct pt_regs, flags) },
{ "cs", 4, offsetof(struct pt_regs, cs) },
{ "ss", 4, offsetof(struct pt_regs, ss) },
+ { "ds", 4, -1 },
+ { "es", 4, -1 },
#endif
+ { "fs", 4, -1 },
+ { "gs", 4, -1 },
};

int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
--
1.7.3.4


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