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authorDaniel Jacobowitz <drow@false.org>2005-08-04 13:41:09 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-08-04 16:28:27 -0700
commite8ed11b9dc07df0134248542ca8e7d40751a6052 (patch)
treefe86ae2bcc5b1bb0ffee134005bd2449aea0eada
parentc91096d85c95c6b7fe8d7065e2aa6825e0bdaca9 (diff)
downloadop-kernel-dev-e8ed11b9dc07df0134248542ca8e7d40751a6052.zip
op-kernel-dev-e8ed11b9dc07df0134248542ca8e7d40751a6052.tar.gz
[PATCH] x86_64: fix 32-bit thread debugging
The IA32 ptrace emulation currently returns the wrong registers for fs/gs; it's returning what x86_64 calls gs_base. We need regs.gsindex in order for GDB to correctly locate the TLS area. Without this patch, the 32-bit GDB testsuite bombs on a 64-bit kernel. With it, results look about like I'd expect, although there are still a handful of kernel-related failures (vsyscall related?). Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com> Acked-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/x86_64/ia32/ptrace32.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86_64/ia32/ptrace32.c b/arch/x86_64/ia32/ptrace32.c
index b98b6d2..2a925e2 100644
--- a/arch/x86_64/ia32/ptrace32.c
+++ b/arch/x86_64/ia32/ptrace32.c
@@ -43,11 +43,11 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val)
switch (regno) {
case offsetof(struct user32, regs.fs):
if (val && (val & 3) != 3) return -EIO;
- child->thread.fs = val & 0xffff;
+ child->thread.fsindex = val & 0xffff;
break;
case offsetof(struct user32, regs.gs):
if (val && (val & 3) != 3) return -EIO;
- child->thread.gs = val & 0xffff;
+ child->thread.gsindex = val & 0xffff;
break;
case offsetof(struct user32, regs.ds):
if (val && (val & 3) != 3) return -EIO;
@@ -138,10 +138,10 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
switch (regno) {
case offsetof(struct user32, regs.fs):
- *val = child->thread.fs;
+ *val = child->thread.fsindex;
break;
case offsetof(struct user32, regs.gs):
- *val = child->thread.gs;
+ *val = child->thread.gsindex;
break;
case offsetof(struct user32, regs.ds):
*val = child->thread.ds;
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