forked from luck/tmp_suning_uos_patched
1bd79336a4
A careful reading of the recent changes to the system call entry/exit paths revealed several problems, plus some things that could be simplified and improved: * 32-bit wasn't testing the _TIF_NOERROR bit in the syscall fast exit path, so it was only doing anything with it once it saw some other bit being set. In other words, the noerror behaviour would apply to the next system call where we had to reschedule or deliver a signal, which is not necessarily the current system call. * 32-bit wasn't doing the call to ptrace_notify in the syscall exit path when the _TIF_SINGLESTEP bit was set. * _TIF_RESTOREALL was in both _TIF_USER_WORK_MASK and _TIF_PERSYSCALL_MASK, which is odd since _TIF_RESTOREALL is only set by system calls. I took it out of _TIF_USER_WORK_MASK. * On 64-bit, _TIF_RESTOREALL wasn't causing the non-volatile registers to be restored (unless perhaps a signal was delivered or the syscall was traced or single-stepped). Thus the non-volatile registers weren't restored on exit from a signal handler. We probably got away with it mostly because signal handlers written in C wouldn't alter the non-volatile registers. * On 32-bit I simplified the code and made it more like 64-bit by making the syscall exit path jump to ret_from_except to handle preemption and signal delivery. * 32-bit was calling do_signal unnecessarily when _TIF_RESTOREALL was set - but I think because of that 32-bit was actually restoring the non-volatile registers on exit from a signal handler. * I changed the order of enabling interrupts and saving the non-volatile registers before calling do_syscall_trace_leave; now we enable interrupts first. Signed-off-by: Paul Mackerras <paulus@samba.org>
175 lines
8.3 KiB
C
175 lines
8.3 KiB
C
/*
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* This program is used to generate definitions needed by
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* assembly language modules.
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*
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* We use the technique used in the OSF Mach kernel code:
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* generate asm statements containing #defines,
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* compile this file to assembler, and then extract the
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* #defines from the assembly-language output.
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*/
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#include <linux/config.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/suspend.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/thread_info.h>
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#include <asm/vdso_datapage.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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int
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main(void)
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{
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DEFINE(THREAD, offsetof(struct task_struct, thread));
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DEFINE(THREAD_INFO, offsetof(struct task_struct, thread_info));
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DEFINE(MM, offsetof(struct task_struct, mm));
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DEFINE(PTRACE, offsetof(struct task_struct, ptrace));
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DEFINE(KSP, offsetof(struct thread_struct, ksp));
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DEFINE(PGDIR, offsetof(struct thread_struct, pgdir));
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DEFINE(LAST_SYSCALL, offsetof(struct thread_struct, last_syscall));
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DEFINE(PT_REGS, offsetof(struct thread_struct, regs));
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DEFINE(THREAD_FPEXC_MODE, offsetof(struct thread_struct, fpexc_mode));
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DEFINE(THREAD_FPR0, offsetof(struct thread_struct, fpr[0]));
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DEFINE(THREAD_FPSCR, offsetof(struct thread_struct, fpscr));
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#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
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DEFINE(THREAD_DBCR0, offsetof(struct thread_struct, dbcr0));
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DEFINE(PT_PTRACED, PT_PTRACED);
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#endif
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#ifdef CONFIG_ALTIVEC
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DEFINE(THREAD_VR0, offsetof(struct thread_struct, vr[0]));
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DEFINE(THREAD_VRSAVE, offsetof(struct thread_struct, vrsave));
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DEFINE(THREAD_VSCR, offsetof(struct thread_struct, vscr));
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DEFINE(THREAD_USED_VR, offsetof(struct thread_struct, used_vr));
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#endif /* CONFIG_ALTIVEC */
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#ifdef CONFIG_SPE
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DEFINE(THREAD_EVR0, offsetof(struct thread_struct, evr[0]));
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DEFINE(THREAD_ACC, offsetof(struct thread_struct, acc));
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DEFINE(THREAD_SPEFSCR, offsetof(struct thread_struct, spefscr));
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DEFINE(THREAD_USED_SPE, offsetof(struct thread_struct, used_spe));
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#endif /* CONFIG_SPE */
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/* Interrupt register frame */
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DEFINE(STACK_FRAME_OVERHEAD, STACK_FRAME_OVERHEAD);
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DEFINE(INT_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs));
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/* in fact we only use gpr0 - gpr9 and gpr20 - gpr23 */
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DEFINE(GPR0, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[0]));
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DEFINE(GPR1, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[1]));
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DEFINE(GPR2, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[2]));
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DEFINE(GPR3, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[3]));
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DEFINE(GPR4, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[4]));
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DEFINE(GPR5, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[5]));
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DEFINE(GPR6, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[6]));
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DEFINE(GPR7, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[7]));
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DEFINE(GPR8, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[8]));
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DEFINE(GPR9, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[9]));
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DEFINE(GPR10, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[10]));
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DEFINE(GPR11, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[11]));
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DEFINE(GPR12, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[12]));
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DEFINE(GPR13, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[13]));
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DEFINE(GPR14, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[14]));
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DEFINE(GPR15, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[15]));
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DEFINE(GPR16, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[16]));
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DEFINE(GPR17, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[17]));
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DEFINE(GPR18, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[18]));
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DEFINE(GPR19, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[19]));
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DEFINE(GPR20, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[20]));
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DEFINE(GPR21, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[21]));
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DEFINE(GPR22, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[22]));
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DEFINE(GPR23, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[23]));
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DEFINE(GPR24, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[24]));
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DEFINE(GPR25, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[25]));
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DEFINE(GPR26, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[26]));
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DEFINE(GPR27, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[27]));
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DEFINE(GPR28, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[28]));
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DEFINE(GPR29, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[29]));
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DEFINE(GPR30, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[30]));
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DEFINE(GPR31, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[31]));
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/* Note: these symbols include _ because they overlap with special
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* register names
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*/
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DEFINE(_NIP, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, nip));
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DEFINE(_MSR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, msr));
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DEFINE(_CTR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, ctr));
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DEFINE(_LINK, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, link));
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DEFINE(_CCR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, ccr));
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DEFINE(_MQ, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, mq));
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DEFINE(_XER, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, xer));
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DEFINE(_DAR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, dar));
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DEFINE(_DSISR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, dsisr));
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/* The PowerPC 400-class & Book-E processors have neither the DAR nor the DSISR
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* SPRs. Hence, we overload them to hold the similar DEAR and ESR SPRs
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* for such processors. For critical interrupts we use them to
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* hold SRR0 and SRR1.
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*/
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DEFINE(_DEAR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, dar));
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DEFINE(_ESR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, dsisr));
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DEFINE(ORIG_GPR3, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, orig_gpr3));
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DEFINE(RESULT, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, result));
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DEFINE(TRAP, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, trap));
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DEFINE(CLONE_VM, CLONE_VM);
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DEFINE(CLONE_UNTRACED, CLONE_UNTRACED);
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DEFINE(MM_PGD, offsetof(struct mm_struct, pgd));
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/* About the CPU features table */
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DEFINE(CPU_SPEC_ENTRY_SIZE, sizeof(struct cpu_spec));
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DEFINE(CPU_SPEC_PVR_MASK, offsetof(struct cpu_spec, pvr_mask));
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DEFINE(CPU_SPEC_PVR_VALUE, offsetof(struct cpu_spec, pvr_value));
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DEFINE(CPU_SPEC_FEATURES, offsetof(struct cpu_spec, cpu_features));
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DEFINE(CPU_SPEC_SETUP, offsetof(struct cpu_spec, cpu_setup));
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DEFINE(TI_TASK, offsetof(struct thread_info, task));
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DEFINE(TI_EXECDOMAIN, offsetof(struct thread_info, exec_domain));
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DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
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DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
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DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
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DEFINE(pbe_address, offsetof(struct pbe, address));
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DEFINE(pbe_orig_address, offsetof(struct pbe, orig_address));
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DEFINE(pbe_next, offsetof(struct pbe, next));
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DEFINE(TASK_SIZE, TASK_SIZE);
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DEFINE(NUM_USER_SEGMENTS, TASK_SIZE>>28);
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/* datapage offsets for use by vdso */
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DEFINE(CFG_TB_ORIG_STAMP, offsetof(struct vdso_data, tb_orig_stamp));
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DEFINE(CFG_TB_TICKS_PER_SEC, offsetof(struct vdso_data, tb_ticks_per_sec));
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DEFINE(CFG_TB_TO_XS, offsetof(struct vdso_data, tb_to_xs));
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DEFINE(CFG_STAMP_XSEC, offsetof(struct vdso_data, stamp_xsec));
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DEFINE(CFG_TB_UPDATE_COUNT, offsetof(struct vdso_data, tb_update_count));
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DEFINE(CFG_TZ_MINUTEWEST, offsetof(struct vdso_data, tz_minuteswest));
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DEFINE(CFG_TZ_DSTTIME, offsetof(struct vdso_data, tz_dsttime));
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DEFINE(CFG_SYSCALL_MAP32, offsetof(struct vdso_data, syscall_map_32));
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DEFINE(WTOM_CLOCK_SEC, offsetof(struct vdso_data, wtom_clock_sec));
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DEFINE(WTOM_CLOCK_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
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DEFINE(TVAL32_TV_SEC, offsetof(struct timeval, tv_sec));
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DEFINE(TVAL32_TV_USEC, offsetof(struct timeval, tv_usec));
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DEFINE(TSPEC32_TV_SEC, offsetof(struct timespec, tv_sec));
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DEFINE(TSPEC32_TV_NSEC, offsetof(struct timespec, tv_nsec));
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/* timeval/timezone offsets for use by vdso */
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DEFINE(TZONE_TZ_MINWEST, offsetof(struct timezone, tz_minuteswest));
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DEFINE(TZONE_TZ_DSTTIME, offsetof(struct timezone, tz_dsttime));
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/* Other bits used by the vdso */
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DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
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DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
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DEFINE(NSEC_PER_SEC, NSEC_PER_SEC);
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DEFINE(CLOCK_REALTIME_RES, TICK_NSEC);
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return 0;
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}
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