From: Daniel Jacobowitz Date: Thu, 4 Aug 2005 20:41:09 +0000 (-0700) Subject: [PATCH] x86_64: fix 32-bit thread debugging X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e8ed11b9dc07df0134248542ca8e7d40751a6052;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [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 Acked-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/x86_64/ia32/ptrace32.c b/arch/x86_64/ia32/ptrace32.c index b98b6d2462f6..2a925e2af390 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;