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aarch64: Improve syscall-cancel stack frame
One push instead of N; use stp/ldp to halve the insns.
This commit is contained in:
Richard Henderson
parent
645d44abe3
commit
b5be459771
10
ChangeLog
10
ChangeLog
@ -1,5 +1,15 @@
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2014-05-29 Richard Henderson <rth@twiddle.net>
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* sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h (PSEUDO):
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Always allocate 64 bytes of stack frame. Use ldp/stp to create
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it and break it down.
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(DOCARGS_0, DOCARGS_1): Do nothing.
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(DOCARGS_2): Update to store into the new stack frame.
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(DOCARGS_3, DOCARGS_4, DOCARGS_5, DOCARGS_6): Likewise.
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(UNDOCARGS_1): Update to restore from the new stack frame.
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(UNDOCARGS_2, UNDOCARGS_3, UNDOCARGS_4): Likewise.
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(UNDOCARGS_5, UNDOCARGS_6): Likewise.
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* sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h
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(SINGLE_THREAD_P): New parameter for result regno.
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(PSEUDO): Update to match; use cbz instead of beq.
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@ -38,20 +38,22 @@ ENTRY (__##syscall_name##_nocancel); \
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ENTRY (name); \
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SINGLE_THREAD_P(16); \
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cbz w16, .Lpseudo_nocancel; \
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DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \
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/* Setup common stack frame no matter the number of args. \
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Also save the first arg, since it's basically free. */ \
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stp x30, x0, [sp, -64]!; \
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cfi_adjust_cfa_offset (64); \
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cfi_rel_offset (x30, 0); \
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DOCARGS_##args; /* save syscall args around CENABLE. */ \
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CENABLE; \
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mov x16, x0; /* put mask in safe place. */ \
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mov x16, x0; /* save mask around syscall. */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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mov x8, SYS_ify (syscall_name); /* do the call. */ \
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svc 0; \
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str x0, [sp, -16]!; /* save syscall return value. */ \
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cfi_adjust_cfa_offset (16); \
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mov x0, x16; /* get mask back. */ \
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DO_CALL (syscall_name, args); \
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str x0, [sp, 8]; /* save result around CDISABLE. */ \
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mov x0, x16; /* restore mask for CDISABLE. */ \
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CDISABLE; \
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ldr x0, [sp], 16; \
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cfi_adjust_cfa_offset (-16); \
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ldr x30, [sp], 16; \
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cfi_adjust_cfa_offset (-16); \
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/* Break down the stack frame, restoring result at once. */ \
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ldp x30, x0, [sp], 64; \
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cfi_adjust_cfa_offset (-64); \
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cfi_restore (x30); \
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b .Lpseudo_finish; \
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cfi_endproc; \
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@ -63,83 +65,21 @@ ENTRY (name); \
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SYSCALL_ERROR_HANDLER; \
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cfi_endproc
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# define DOCARGS_0 \
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str x30, [sp, -16]!; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (x30, 0)
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# define DOCARGS_0
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# define DOCARGS_1
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# define DOCARGS_2 str x1, [sp, 16]
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# define DOCARGS_3 stp x1, x2, [sp, 16]
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# define DOCARGS_4 DOCARGS_3; str x3, [sp, 32]
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# define DOCARGS_5 DOCARGS_3; stp x3, x4, [sp, 32]
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# define DOCARGS_6 DOCARGS_5; str x5, [sp, 48]
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# define UNDOCARGS_0
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# define DOCARGS_1 \
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DOCARGS_0; \
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str x0, [sp, -16]!; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (x0, 0)
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# define UNDOCARGS_1 \
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ldr x0, [sp], 16; \
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cfi_restore (x0); \
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cfi_adjust_cfa_offset (-16); \
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# define DOCARGS_2 \
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DOCARGS_1; \
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str x1, [sp, -16]!; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (x1, 0)
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# define UNDOCARGS_2 \
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ldr x1, [sp], 16; \
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cfi_restore (x1); \
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cfi_adjust_cfa_offset (-16); \
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UNDOCARGS_1
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# define DOCARGS_3 \
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DOCARGS_2; \
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str x2, [sp, -16]!; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (x2, 0)
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# define UNDOCARGS_3 \
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ldr x2, [sp], 16; \
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cfi_restore (x2); \
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cfi_adjust_cfa_offset (-16); \
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UNDOCARGS_2
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# define DOCARGS_4 \
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DOCARGS_3; \
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str x3, [sp, -16]!; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (x3, 0)
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# define UNDOCARGS_4 \
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ldr x3, [sp], 16; \
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cfi_restore (x3); \
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cfi_adjust_cfa_offset (-16); \
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UNDOCARGS_3
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# define DOCARGS_5 \
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DOCARGS_4; \
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str x4, [sp, -16]!; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (x4, 0)
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# define UNDOCARGS_5 \
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ldr x4, [sp], 16; \
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cfi_restore (x4); \
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cfi_adjust_cfa_offset (-16); \
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UNDOCARGS_4
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# define DOCARGS_6 \
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DOCARGS_5; \
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str x5, [sp, -16]!; \
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cfi_adjust_cfa_offset (16); \
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cfi_rel_offset (x5, 0)
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# define UNDOCARGS_6 \
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ldr x5, [sp], 16; \
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cfi_restore (x5); \
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cfi_adjust_cfa_offset (-16); \
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UNDOCARGS_5
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# define UNDOCARGS_1 ldr x0, [sp, 8]
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# define UNDOCARGS_2 ldp x0, x1, [sp, 8]
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# define UNDOCARGS_3 UNDOCARGS_1; ldp x1, x2, [sp, 16]
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# define UNDOCARGS_4 UNDOCARGS_2; ldp x2, x3, [sp, 24]
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# define UNDOCARGS_5 UNDOCARGS_3; ldp x3, x4, [sp, 32]
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# define UNDOCARGS_6 UNDOCARGS_4; ldp x4, x5, [sp, 40]
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# ifdef IS_IN_libpthread
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# define CENABLE bl __pthread_enable_asynccancel
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