Linux Kernel  3.7.1
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entry.h
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1 
2 /*
3  * Preserved registers that are shared between code in ivt.S and
4  * entry.S. Be careful not to step on these!
5  */
6 #define PRED_LEAVE_SYSCALL 1 /* TRUE iff leave from syscall */
7 #define PRED_KERNEL_STACK 2 /* returning to kernel-stacks? */
8 #define PRED_USER_STACK 3 /* returning to user-stacks? */
9 #define PRED_SYSCALL 4 /* inside a system call? */
10 #define PRED_NON_SYSCALL 5 /* complement of PRED_SYSCALL */
11 
12 #ifdef __ASSEMBLY__
13 # define PASTE2(x,y) x##y
14 # define PASTE(x,y) PASTE2(x,y)
15 
16 # define pLvSys PASTE(p,PRED_LEAVE_SYSCALL)
17 # define pKStk PASTE(p,PRED_KERNEL_STACK)
18 # define pUStk PASTE(p,PRED_USER_STACK)
19 # define pSys PASTE(p,PRED_SYSCALL)
20 # define pNonSys PASTE(p,PRED_NON_SYSCALL)
21 #endif
22 
23 #define PT(f) (IA64_PT_REGS_##f##_OFFSET)
24 #define SW(f) (IA64_SWITCH_STACK_##f##_OFFSET)
25 #define SOS(f) (IA64_SAL_OS_STATE_##f##_OFFSET)
26 
27 #define PT_REGS_SAVES(off) \
28  .unwabi 3, 'i'; \
29  .fframe IA64_PT_REGS_SIZE+16+(off); \
30  .spillsp rp, PT(CR_IIP)+16+(off); \
31  .spillsp ar.pfs, PT(CR_IFS)+16+(off); \
32  .spillsp ar.unat, PT(AR_UNAT)+16+(off); \
33  .spillsp ar.fpsr, PT(AR_FPSR)+16+(off); \
34  .spillsp pr, PT(PR)+16+(off);
35 
36 #define PT_REGS_UNWIND_INFO(off) \
37  .prologue; \
38  PT_REGS_SAVES(off); \
39  .body
40 
41 #define SWITCH_STACK_SAVES(off) \
42  .savesp ar.unat,SW(CALLER_UNAT)+16+(off); \
43  .savesp ar.fpsr,SW(AR_FPSR)+16+(off); \
44  .spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off); \
45  .spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off); \
46  .spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off); \
47  .spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off); \
48  .spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off); \
49  .spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off); \
50  .spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off); \
51  .spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off); \
52  .spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off); \
53  .spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off); \
54  .spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off); \
55  .spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off); \
56  .spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off); \
57  .spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off); \
58  .spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off); \
59  .spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off); \
60  .spillsp @priunat,SW(AR_UNAT)+16+(off); \
61  .spillsp ar.rnat,SW(AR_RNAT)+16+(off); \
62  .spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off); \
63  .spillsp pr,SW(PR)+16+(off)
64 
65 #define DO_SAVE_SWITCH_STACK \
66  movl r28=1f; \
67  ;; \
68  .fframe IA64_SWITCH_STACK_SIZE; \
69  adds sp=-IA64_SWITCH_STACK_SIZE,sp; \
70  mov.ret.sptk b7=r28,1f; \
71  SWITCH_STACK_SAVES(0); \
72  br.cond.sptk.many save_switch_stack; \
73 1:
74 
75 #define DO_LOAD_SWITCH_STACK \
76  movl r28=1f; \
77  ;; \
78  invala; \
79  mov.ret.sptk b7=r28,1f; \
80  br.cond.sptk.many load_switch_stack; \
81 1: .restore sp; \
82  adds sp=IA64_SWITCH_STACK_SIZE,sp