f95d47caae
This patch is the meat of the PDA change. This patch makes several related changes: 1: Most significantly, %gs is now used in the kernel. This means that on entry, the old value of %gs is saved away, and it is reloaded with __KERNEL_PDA. 2: entry.S constructs the stack in the shape of struct pt_regs, and this is passed around the kernel so that the process's saved register state can be accessed. Unfortunately struct pt_regs doesn't currently have space for %gs (or %fs). This patch extends pt_regs to add space for gs (no space is allocated for %fs, since it won't be used, and it would just complicate the code in entry.S to work around the space). 3: Because %gs is now saved on the stack like %ds, %es and the integer registers, there are a number of places where it no longer needs to be handled specially; namely context switch, and saving/restoring the register state in a signal context. 4: And since kernel threads run in kernel space and call normal kernel code, they need to be created with their %gs == __KERNEL_PDA. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Chuck Ebbert <76306.1226@compuserve.com> Cc: Zachary Amsden <zach@vmware.com> Cc: Jan Beulich <jbeulich@novell.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org>
100 lines
3 KiB
C
100 lines
3 KiB
C
/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed
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* to extract and format the required data.
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*/
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#include <linux/crypto.h>
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/personality.h>
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#include <linux/suspend.h>
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#include <asm/ucontext.h>
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#include "sigframe.h"
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#include <asm/fixmap.h>
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#include <asm/processor.h>
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#include <asm/thread_info.h>
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#include <asm/elf.h>
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#define DEFINE(sym, val) \
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asm volatile("\n->" #sym " %0 " #val : : "i" (val))
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#define BLANK() asm volatile("\n->" : : )
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#define OFFSET(sym, str, mem) \
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DEFINE(sym, offsetof(struct str, mem));
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void foo(void)
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{
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OFFSET(SIGCONTEXT_eax, sigcontext, eax);
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OFFSET(SIGCONTEXT_ebx, sigcontext, ebx);
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OFFSET(SIGCONTEXT_ecx, sigcontext, ecx);
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OFFSET(SIGCONTEXT_edx, sigcontext, edx);
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OFFSET(SIGCONTEXT_esi, sigcontext, esi);
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OFFSET(SIGCONTEXT_edi, sigcontext, edi);
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OFFSET(SIGCONTEXT_ebp, sigcontext, ebp);
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OFFSET(SIGCONTEXT_esp, sigcontext, esp);
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OFFSET(SIGCONTEXT_eip, sigcontext, eip);
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BLANK();
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OFFSET(CPUINFO_x86, cpuinfo_x86, x86);
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OFFSET(CPUINFO_x86_vendor, cpuinfo_x86, x86_vendor);
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OFFSET(CPUINFO_x86_model, cpuinfo_x86, x86_model);
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OFFSET(CPUINFO_x86_mask, cpuinfo_x86, x86_mask);
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OFFSET(CPUINFO_hard_math, cpuinfo_x86, hard_math);
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OFFSET(CPUINFO_cpuid_level, cpuinfo_x86, cpuid_level);
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OFFSET(CPUINFO_x86_capability, cpuinfo_x86, x86_capability);
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OFFSET(CPUINFO_x86_vendor_id, cpuinfo_x86, x86_vendor_id);
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BLANK();
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OFFSET(TI_task, thread_info, task);
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OFFSET(TI_exec_domain, thread_info, exec_domain);
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OFFSET(TI_flags, thread_info, flags);
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OFFSET(TI_status, thread_info, status);
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OFFSET(TI_cpu, thread_info, cpu);
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OFFSET(TI_preempt_count, thread_info, preempt_count);
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OFFSET(TI_addr_limit, thread_info, addr_limit);
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OFFSET(TI_restart_block, thread_info, restart_block);
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OFFSET(TI_sysenter_return, thread_info, sysenter_return);
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BLANK();
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OFFSET(GDS_size, Xgt_desc_struct, size);
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OFFSET(GDS_address, Xgt_desc_struct, address);
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OFFSET(GDS_pad, Xgt_desc_struct, pad);
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BLANK();
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OFFSET(PT_EBX, pt_regs, ebx);
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OFFSET(PT_ECX, pt_regs, ecx);
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OFFSET(PT_EDX, pt_regs, edx);
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OFFSET(PT_ESI, pt_regs, esi);
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OFFSET(PT_EDI, pt_regs, edi);
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OFFSET(PT_EBP, pt_regs, ebp);
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OFFSET(PT_EAX, pt_regs, eax);
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OFFSET(PT_DS, pt_regs, xds);
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OFFSET(PT_ES, pt_regs, xes);
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OFFSET(PT_GS, pt_regs, xgs);
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OFFSET(PT_ORIG_EAX, pt_regs, orig_eax);
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OFFSET(PT_EIP, pt_regs, eip);
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OFFSET(PT_CS, pt_regs, xcs);
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OFFSET(PT_EFLAGS, pt_regs, eflags);
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OFFSET(PT_OLDESP, pt_regs, esp);
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OFFSET(PT_OLDSS, pt_regs, xss);
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BLANK();
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OFFSET(EXEC_DOMAIN_handler, exec_domain, handler);
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OFFSET(RT_SIGFRAME_sigcontext, rt_sigframe, uc.uc_mcontext);
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BLANK();
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OFFSET(pbe_address, pbe, address);
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OFFSET(pbe_orig_address, pbe, orig_address);
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OFFSET(pbe_next, pbe, next);
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/* Offset from the sysenter stack to tss.esp0 */
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DEFINE(TSS_sysenter_esp0, offsetof(struct tss_struct, esp0) -
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sizeof(struct tss_struct));
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DEFINE(PAGE_SIZE_asm, PAGE_SIZE);
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DEFINE(VDSO_PRELINK, VDSO_PRELINK);
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OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx);
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}
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