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fbe765680d
kernel_optimize_test/arch/s390/kernel/asm-offsets.c
Heiko Carstens fbe765680d s390/smp: make absolute lowcore / cpu restart parameter accesses more robust 
Setting the cpu restart parameters is done in three different fashions:
- directly setting the four parameters individually
- copying the four parameters with memcpy (using 4 * sizeof(long))
- copying the four parameters using a private structure

In addition code in entry*.S relies on a certain order of the restart
members of struct _lowcore.

Make all of this more robust to future changes by adding a
mem_absolute_assign(dest, val) define, which assigns val to dest
using absolute addressing mode. Also the load multiple instructions
in entry*.S have been split into separate load instruction so the
order of the struct _lowcore members doesn't matter anymore.

In addition move the prototypes of memcpy_real/absolute from uaccess.h
to processor.h. These memcpy* variants are not related to uaccess at all.
string.h doesn't seem to match as well, so lets use processor.h.

Also replace the eight byte array in struct _lowcore which represents a
misaliged u64 with a u64. The compiler will always create code that
handles the misaligned u64 correctly.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-06-14 09:09:02 +02:00

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/*
* Generate definitions needed by assembly language modules.
* This code generates raw asm output which is post-processed to extract
* and format the required data.
*/
#define ASM_OFFSETS_C
#include <linux/kbuild.h>
#include <linux/sched.h>
#include <asm/cputime.h>
#include <asm/timer.h>
#include <asm/vdso.h>
#include <asm/pgtable.h>
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the "Q" assembler constraint.
*/
#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
#error Your compiler is too old; please use version 3.3.3 or newer
#endif
int main(void)
{
DEFINE(__THREAD_info, offsetof(struct task_struct, stack));
DEFINE(__THREAD_ksp, offsetof(struct task_struct, thread.ksp));
DEFINE(__THREAD_mm_segment, offsetof(struct task_struct, thread.mm_segment));
BLANK();
DEFINE(__TASK_pid, offsetof(struct task_struct, pid));
BLANK();
DEFINE(__THREAD_per_cause, offsetof(struct task_struct, thread.per_event.cause));
DEFINE(__THREAD_per_address, offsetof(struct task_struct, thread.per_event.address));
DEFINE(__THREAD_per_paid, offsetof(struct task_struct, thread.per_event.paid));
BLANK();
DEFINE(__TI_task, offsetof(struct thread_info, task));
DEFINE(__TI_domain, offsetof(struct thread_info, exec_domain));
DEFINE(__TI_flags, offsetof(struct thread_info, flags));
DEFINE(__TI_cpu, offsetof(struct thread_info, cpu));
DEFINE(__TI_precount, offsetof(struct thread_info, preempt_count));
DEFINE(__TI_user_timer, offsetof(struct thread_info, user_timer));
DEFINE(__TI_system_timer, offsetof(struct thread_info, system_timer));
DEFINE(__TI_last_break, offsetof(struct thread_info, last_break));
BLANK();
DEFINE(__PT_ARGS, offsetof(struct pt_regs, args));
DEFINE(__PT_PSW, offsetof(struct pt_regs, psw));
DEFINE(__PT_GPRS, offsetof(struct pt_regs, gprs));
DEFINE(__PT_ORIG_GPR2, offsetof(struct pt_regs, orig_gpr2));
DEFINE(__PT_INT_CODE, offsetof(struct pt_regs, int_code));
DEFINE(__PT_INT_PARM_LONG, offsetof(struct pt_regs, int_parm_long));
DEFINE(__PT_SIZE, sizeof(struct pt_regs));
BLANK();
DEFINE(__SF_BACKCHAIN, offsetof(struct stack_frame, back_chain));
DEFINE(__SF_GPRS, offsetof(struct stack_frame, gprs));
DEFINE(__SF_EMPTY, offsetof(struct stack_frame, empty1));
BLANK();
/* timeval/timezone offsets for use by vdso */
DEFINE(__VDSO_UPD_COUNT, offsetof(struct vdso_data, tb_update_count));
DEFINE(__VDSO_XTIME_STAMP, offsetof(struct vdso_data, xtime_tod_stamp));
DEFINE(__VDSO_XTIME_SEC, offsetof(struct vdso_data, xtime_clock_sec));
DEFINE(__VDSO_XTIME_NSEC, offsetof(struct vdso_data, xtime_clock_nsec));
DEFINE(__VDSO_WTOM_SEC, offsetof(struct vdso_data, wtom_clock_sec));
DEFINE(__VDSO_WTOM_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
DEFINE(__VDSO_TIMEZONE, offsetof(struct vdso_data, tz_minuteswest));
DEFINE(__VDSO_ECTG_OK, offsetof(struct vdso_data, ectg_available));
DEFINE(__VDSO_NTP_MULT, offsetof(struct vdso_data, ntp_mult));
DEFINE(__VDSO_ECTG_BASE, offsetof(struct vdso_per_cpu_data, ectg_timer_base));
DEFINE(__VDSO_ECTG_USER, offsetof(struct vdso_per_cpu_data, ectg_user_time));
/* constants used by the vdso */
DEFINE(__CLOCK_REALTIME, CLOCK_REALTIME);
DEFINE(__CLOCK_MONOTONIC, CLOCK_MONOTONIC);
DEFINE(__CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
BLANK();
/* idle data offsets */
DEFINE(__IDLE_ENTER, offsetof(struct s390_idle_data, idle_enter));
DEFINE(__IDLE_EXIT, offsetof(struct s390_idle_data, idle_exit));
/* vtimer queue offsets */
DEFINE(__VQ_IDLE_ENTER, offsetof(struct vtimer_queue, idle_enter));
DEFINE(__VQ_IDLE_EXIT, offsetof(struct vtimer_queue, idle_exit));
/* lowcore offsets */
DEFINE(__LC_EXT_PARAMS, offsetof(struct _lowcore, ext_params));
DEFINE(__LC_EXT_CPU_ADDR, offsetof(struct _lowcore, ext_cpu_addr));
DEFINE(__LC_EXT_INT_CODE, offsetof(struct _lowcore, ext_int_code));
DEFINE(__LC_SVC_ILC, offsetof(struct _lowcore, svc_ilc));
DEFINE(__LC_SVC_INT_CODE, offsetof(struct _lowcore, svc_code));
DEFINE(__LC_PGM_ILC, offsetof(struct _lowcore, pgm_ilc));
DEFINE(__LC_PGM_INT_CODE, offsetof(struct _lowcore, pgm_code));
DEFINE(__LC_TRANS_EXC_CODE, offsetof(struct _lowcore, trans_exc_code));
DEFINE(__LC_PER_CAUSE, offsetof(struct _lowcore, per_perc_atmid));
DEFINE(__LC_PER_ADDRESS, offsetof(struct _lowcore, per_address));
DEFINE(__LC_PER_PAID, offsetof(struct _lowcore, per_access_id));
DEFINE(__LC_AR_MODE_ID, offsetof(struct _lowcore, ar_access_id));
DEFINE(__LC_SUBCHANNEL_ID, offsetof(struct _lowcore, subchannel_id));
DEFINE(__LC_SUBCHANNEL_NR, offsetof(struct _lowcore, subchannel_nr));
DEFINE(__LC_IO_INT_PARM, offsetof(struct _lowcore, io_int_parm));
DEFINE(__LC_IO_INT_WORD, offsetof(struct _lowcore, io_int_word));
DEFINE(__LC_STFL_FAC_LIST, offsetof(struct _lowcore, stfl_fac_list));
DEFINE(__LC_MCCK_CODE, offsetof(struct _lowcore, mcck_interruption_code));
DEFINE(__LC_RST_OLD_PSW, offsetof(struct _lowcore, restart_old_psw));
DEFINE(__LC_EXT_OLD_PSW, offsetof(struct _lowcore, external_old_psw));
DEFINE(__LC_SVC_OLD_PSW, offsetof(struct _lowcore, svc_old_psw));
DEFINE(__LC_PGM_OLD_PSW, offsetof(struct _lowcore, program_old_psw));
DEFINE(__LC_MCK_OLD_PSW, offsetof(struct _lowcore, mcck_old_psw));
DEFINE(__LC_IO_OLD_PSW, offsetof(struct _lowcore, io_old_psw));
DEFINE(__LC_RST_NEW_PSW, offsetof(struct _lowcore, restart_psw));
DEFINE(__LC_EXT_NEW_PSW, offsetof(struct _lowcore, external_new_psw));
DEFINE(__LC_SVC_NEW_PSW, offsetof(struct _lowcore, svc_new_psw));
DEFINE(__LC_PGM_NEW_PSW, offsetof(struct _lowcore, program_new_psw));
DEFINE(__LC_MCK_NEW_PSW, offsetof(struct _lowcore, mcck_new_psw));
DEFINE(__LC_IO_NEW_PSW, offsetof(struct _lowcore, io_new_psw));
BLANK();
DEFINE(__LC_SAVE_AREA_SYNC, offsetof(struct _lowcore, save_area_sync));
DEFINE(__LC_SAVE_AREA_ASYNC, offsetof(struct _lowcore, save_area_async));
DEFINE(__LC_SAVE_AREA_RESTART, offsetof(struct _lowcore, save_area_restart));
DEFINE(__LC_RETURN_PSW, offsetof(struct _lowcore, return_psw));
DEFINE(__LC_RETURN_MCCK_PSW, offsetof(struct _lowcore, return_mcck_psw));
DEFINE(__LC_SYNC_ENTER_TIMER, offsetof(struct _lowcore, sync_enter_timer));
DEFINE(__LC_ASYNC_ENTER_TIMER, offsetof(struct _lowcore, async_enter_timer));
DEFINE(__LC_MCCK_ENTER_TIMER, offsetof(struct _lowcore, mcck_enter_timer));
DEFINE(__LC_EXIT_TIMER, offsetof(struct _lowcore, exit_timer));
DEFINE(__LC_USER_TIMER, offsetof(struct _lowcore, user_timer));
DEFINE(__LC_SYSTEM_TIMER, offsetof(struct _lowcore, system_timer));
DEFINE(__LC_STEAL_TIMER, offsetof(struct _lowcore, steal_timer));
DEFINE(__LC_LAST_UPDATE_TIMER, offsetof(struct _lowcore, last_update_timer));
DEFINE(__LC_LAST_UPDATE_CLOCK, offsetof(struct _lowcore, last_update_clock));
DEFINE(__LC_CURRENT, offsetof(struct _lowcore, current_task));
DEFINE(__LC_CURRENT_PID, offsetof(struct _lowcore, current_pid));
DEFINE(__LC_THREAD_INFO, offsetof(struct _lowcore, thread_info));
DEFINE(__LC_KERNEL_STACK, offsetof(struct _lowcore, kernel_stack));
DEFINE(__LC_ASYNC_STACK, offsetof(struct _lowcore, async_stack));
DEFINE(__LC_PANIC_STACK, offsetof(struct _lowcore, panic_stack));
DEFINE(__LC_RESTART_STACK, offsetof(struct _lowcore, restart_stack));
DEFINE(__LC_RESTART_FN, offsetof(struct _lowcore, restart_fn));
DEFINE(__LC_RESTART_DATA, offsetof(struct _lowcore, restart_data));
DEFINE(__LC_RESTART_SOURCE, offsetof(struct _lowcore, restart_source));
DEFINE(__LC_USER_ASCE, offsetof(struct _lowcore, user_asce));
DEFINE(__LC_INT_CLOCK, offsetof(struct _lowcore, int_clock));
DEFINE(__LC_MCCK_CLOCK, offsetof(struct _lowcore, mcck_clock));
DEFINE(__LC_MACHINE_FLAGS, offsetof(struct _lowcore, machine_flags));
DEFINE(__LC_FTRACE_FUNC, offsetof(struct _lowcore, ftrace_func));
DEFINE(__LC_IRB, offsetof(struct _lowcore, irb));
DEFINE(__LC_DUMP_REIPL, offsetof(struct _lowcore, ipib));
BLANK();
DEFINE(__LC_CPU_TIMER_SAVE_AREA, offsetof(struct _lowcore, cpu_timer_save_area));
DEFINE(__LC_CLOCK_COMP_SAVE_AREA, offsetof(struct _lowcore, clock_comp_save_area));
DEFINE(__LC_PSW_SAVE_AREA, offsetof(struct _lowcore, psw_save_area));
DEFINE(__LC_PREFIX_SAVE_AREA, offsetof(struct _lowcore, prefixreg_save_area));
DEFINE(__LC_AREGS_SAVE_AREA, offsetof(struct _lowcore, access_regs_save_area));
DEFINE(__LC_FPREGS_SAVE_AREA, offsetof(struct _lowcore, floating_pt_save_area));
DEFINE(__LC_GPREGS_SAVE_AREA, offsetof(struct _lowcore, gpregs_save_area));
DEFINE(__LC_CREGS_SAVE_AREA, offsetof(struct _lowcore, cregs_save_area));
#ifdef CONFIG_32BIT
DEFINE(SAVE_AREA_BASE, offsetof(struct _lowcore, extended_save_area_addr));
#else /* CONFIG_32BIT */
DEFINE(__LC_EXT_PARAMS2, offsetof(struct _lowcore, ext_params2));
DEFINE(SAVE_AREA_BASE, offsetof(struct _lowcore, floating_pt_save_area));
DEFINE(__LC_PASTE, offsetof(struct _lowcore, paste));
DEFINE(__LC_FP_CREG_SAVE_AREA, offsetof(struct _lowcore, fpt_creg_save_area));
DEFINE(__LC_LAST_BREAK, offsetof(struct _lowcore, breaking_event_addr));
DEFINE(__LC_VDSO_PER_CPU, offsetof(struct _lowcore, vdso_per_cpu_data));
DEFINE(__LC_GMAP, offsetof(struct _lowcore, gmap));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
#endif /* CONFIG_32BIT */
return 0;
}
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