entry.h

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/*
 * Preserved registers that are shared between code in ivt.S and
 * entry.S.  Be careful not to step on these!
 */
#define PRED_LEAVE_SYSCALL  1 /* TRUE iff leave from syscall */
#define PRED_KERNEL_STACK   2 /* returning to kernel-stacks? */
#define PRED_USER_STACK     3 /* returning to user-stacks? */
#define PRED_SYSCALL        4 /* inside a system call? */
#define PRED_NON_SYSCALL    5 /* complement of PRED_SYSCALL */

#ifdef __ASSEMBLY__
# define PASTE2(x,y)    x##y
# define PASTE(x,y) PASTE2(x,y)

# define pLvSys     PASTE(p,PRED_LEAVE_SYSCALL)
# define pKStk      PASTE(p,PRED_KERNEL_STACK)
# define pUStk      PASTE(p,PRED_USER_STACK)
# define pSys       PASTE(p,PRED_SYSCALL)
# define pNonSys    PASTE(p,PRED_NON_SYSCALL)
#endif

#define PT(f)       (IA64_PT_REGS_##f##_OFFSET)
#define SW(f)       (IA64_SWITCH_STACK_##f##_OFFSET)
#define SOS(f)      (IA64_SAL_OS_STATE_##f##_OFFSET)

#define PT_REGS_SAVES(off)          \
    .unwabi 3, 'i';             \
    .fframe IA64_PT_REGS_SIZE+16+(off); \
    .spillsp rp, PT(CR_IIP)+16+(off);   \
    .spillsp ar.pfs, PT(CR_IFS)+16+(off);   \
    .spillsp ar.unat, PT(AR_UNAT)+16+(off); \
    .spillsp ar.fpsr, PT(AR_FPSR)+16+(off); \
    .spillsp pr, PT(PR)+16+(off);

#define PT_REGS_UNWIND_INFO(off)        \
    .prologue;              \
    PT_REGS_SAVES(off);         \
    .body

#define SWITCH_STACK_SAVES(off)                         \
    .savesp ar.unat,SW(CALLER_UNAT)+16+(off);               \
    .savesp ar.fpsr,SW(AR_FPSR)+16+(off);                   \
    .spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off);       \
    .spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off);       \
    .spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off);       \
    .spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off);       \
    .spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off);       \
    .spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off);       \
    .spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off);       \
    .spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off);       \
    .spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off);       \
    .spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off);       \
    .spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off);       \
    .spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off);       \
    .spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off);       \
    .spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off);       \
    .spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off);       \
    .spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off); \
    .spillsp @priunat,SW(AR_UNAT)+16+(off);                 \
    .spillsp ar.rnat,SW(AR_RNAT)+16+(off);                  \
    .spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off);              \
    .spillsp pr,SW(PR)+16+(off)

#define DO_SAVE_SWITCH_STACK            \
    movl r28=1f;                \
    ;;                  \
    .fframe IA64_SWITCH_STACK_SIZE;     \
    adds sp=-IA64_SWITCH_STACK_SIZE,sp; \
    mov.ret.sptk b7=r28,1f;         \
    SWITCH_STACK_SAVES(0);          \
    br.cond.sptk.many save_switch_stack;    \
1:

#define DO_LOAD_SWITCH_STACK            \
    movl r28=1f;                \
    ;;                  \
    invala;                 \
    mov.ret.sptk b7=r28,1f;         \
    br.cond.sptk.many load_switch_stack;    \
1:  .restore sp;                \
    adds sp=IA64_SWITCH_STACK_SIZE,sp