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kernel: Explicit registers assignment

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Since types might be changed one day

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Cyrill Gorcunov
2011-10-11 14:41:22 +04:00
parent c3553db68b
commit 7d712407aa
1 changed files with 59 additions and 23 deletions
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82
kernel/binfmt-elf-for-cr-5
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@@ -27,7 +27,7 @@ Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
arch/x86/include/asm/elf.h | 3
arch/x86/include/asm/elf_ckpt.h | 80 ++++++++
arch/x86/kernel/Makefile | 2
arch/x86/kernel/elf_ckpt.c | 109 +++++++++++
arch/x86/kernel/elf_ckpt.c | 145 +++++++++++++++
arch/x86/vdso/vma.c | 22 ++
fs/Kconfig.binfmt | 11 +
fs/Makefile | 1
@@ -36,7 +36,7 @@ Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
fs/exec.c | 27 +-
include/linux/binfmts.h | 1
include/linux/elf_ckpt.h | 90 +++++++++
12 files changed, 732 insertions(+), 12 deletions(-)
12 files changed, 768 insertions(+), 12 deletions(-)
Index: linux-2.6.git/arch/x86/include/asm/elf.h
===================================================================
@@ -154,7 +154,7 @@ Index: linux-2.6.git/arch/x86/kernel/elf_ckpt.c
===================================================================
--- /dev/null
+++ linux-2.6.git/arch/x86/kernel/elf_ckpt.c
@@ -0,0 +1,109 @@
@@ -0,0 +1,145 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
@@ -194,30 +194,66 @@ Index: linux-2.6.git/arch/x86/kernel/elf_ckpt.c
+
+#ifdef CONFIG_X86_64
+
+#define cp_reg(s, d, r) s.r = d.r
+
+int load_elf_ckpt_arch(struct task_struct *tsk, struct pt_regs *regs,
+ struct core_entry *core_entry)
+{
+ struct ckpt_arch_entry *arch = (struct ckpt_arch_entry *)core_entry->arch;
+ struct thread_struct *thread = &current->thread;
+ struct pt_regs *pt_regs_me = task_pt_regs(current);
+
+ struct user_regs_struct gpregs;
+ struct user_i387_struct fpregs;
+
+ mm_segment_t old_fs;
+ int i, ret;
+
+ BUILD_BUG_ON(CKPT_GDT_ENTRY_TLS_ENTRIES != GDT_ENTRY_TLS_ENTRIES);
+ BUILD_BUG_ON(sizeof(struct ckpt_arch_entry) > CKPT_ARCH_SIZE);
+
+ memset(&gpregs, 0, sizeof(gpregs));
+ memset(&fpregs, 0, sizeof(fpregs));
+
+ /*
+ * Registers setup.
+ */
+
+ cp_reg(arch->gpregs, gpregs, r15);
+ cp_reg(arch->gpregs, gpregs, r14);
+ cp_reg(arch->gpregs, gpregs, r13);
+ cp_reg(arch->gpregs, gpregs, r12);
+ cp_reg(arch->gpregs, gpregs, bp);
+ cp_reg(arch->gpregs, gpregs, bx);
+ cp_reg(arch->gpregs, gpregs, r11);
+ cp_reg(arch->gpregs, gpregs, r10);
+ cp_reg(arch->gpregs, gpregs, r9);
+ cp_reg(arch->gpregs, gpregs, r8);
+ cp_reg(arch->gpregs, gpregs, ax);
+ cp_reg(arch->gpregs, gpregs, cx);
+ cp_reg(arch->gpregs, gpregs, dx);
+ cp_reg(arch->gpregs, gpregs, si);
+ cp_reg(arch->gpregs, gpregs, di);
+ cp_reg(arch->gpregs, gpregs, orig_ax);
+ cp_reg(arch->gpregs, gpregs, ip);
+ cp_reg(arch->gpregs, gpregs, cs);
+ cp_reg(arch->gpregs, gpregs, flags);
+ cp_reg(arch->gpregs, gpregs, sp);
+ cp_reg(arch->gpregs, gpregs, ss);
+ cp_reg(arch->gpregs, gpregs, fs_base);
+ cp_reg(arch->gpregs, gpregs, gs_base);
+ cp_reg(arch->gpregs, gpregs, ds);
+ cp_reg(arch->gpregs, gpregs, es);
+ cp_reg(arch->gpregs, gpregs, fs);
+ cp_reg(arch->gpregs, gpregs, gs);
+
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = arch_ptrace(current, PTRACE_SETREGS, 0, (unsigned long)&arch->gpregs);
+ ret = arch_ptrace(current, PTRACE_SETREGS, 0, (unsigned long)&gpregs);
+ set_fs(old_fs);
+ if (ret)
+ goto out;
+
+ *regs = *pt_regs_me;
+ *regs = *task_pt_regs(current);
+
+ thread->usersp = arch->gpregs.sp;
+ thread->ds = arch->gpregs.ds;
@@ -233,23 +269,27 @@ Index: linux-2.6.git/arch/x86/kernel/elf_ckpt.c
+ thread->tls_array[i].b = arch->tls_array[i].b;
+ }
+
+ if (arch->gpregs.fs_base) {
+ ret = do_arch_prctl(current, ARCH_SET_FS, arch->gpregs.fs_base);
+ if (ret)
+ goto out_put;
+ }
+
+ if (arch->gpregs.gs_base) {
+ ret = do_arch_prctl(current, ARCH_SET_GS, arch->gpregs.gs_base);
+ if (ret)
+ goto out_put;
+ }
+
+ /* Restoring FPU */
+ if (core_entry->task_flags & PF_USED_MATH) {
+
+ cp_reg(arch->fpregs, fpregs, cwd);
+ cp_reg(arch->fpregs, fpregs, swd);
+ cp_reg(arch->fpregs, fpregs, twd);
+ cp_reg(arch->fpregs, fpregs, fop);
+ cp_reg(arch->fpregs, fpregs, rip);
+ cp_reg(arch->fpregs, fpregs, rdp);
+ cp_reg(arch->fpregs, fpregs, mxcsr);
+ cp_reg(arch->fpregs, fpregs, mxcsr_mask);
+
+ for (i = 0; i < ARRAY_SIZE(arch->fpregs.st_space); i++)
+ cp_reg(arch->fpregs, fpregs, st_space[i]);
+
+ for (i = 0; i < ARRAY_SIZE(arch->fpregs.xmm_space); i++)
+ cp_reg(arch->fpregs, fpregs, xmm_space[i]);
+
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = arch_ptrace(current, PTRACE_SETFPREGS, 0, (unsigned long)&arch->fpregs);
+ ret = arch_ptrace(current, PTRACE_SETFPREGS, 0, (unsigned long)&fpregs);
+ set_fs(old_fs);
+ if (ret)
+ goto out;
@@ -257,10 +297,6 @@ Index: linux-2.6.git/arch/x86/kernel/elf_ckpt.c
+
+out:
+ return ret;
+
+out_put:
+ put_cpu();
+ goto out;
+}
+
+#endif /* CONFIG_X86_64 */