github.com/aloncn/graphics-go@v0.0.1/src/runtime/cgo/gcc_ppc64x.S (about)

     1  // Copyright 2014 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build ppc64 ppc64le
     6  
     7  /*
     8   * Apple still insists on underscore prefixes for C function names.
     9   */
    10  #if defined(__APPLE__)
    11  #define EXT(s) _##s
    12  #else
    13  #define EXT(s) s
    14  #endif
    15  
    16  /*
    17   * void crosscall_ppc64(void (*fn)(void), void *g)
    18   *
    19   * Calling into the gc tool chain, where all registers are caller save.
    20   * Called from standard ppc64 C ABI, where r2, r14-r31, f14-f31 are
    21   * callee-save, so they must be saved explicitly.
    22   */
    23  .globl EXT(crosscall_ppc64)
    24  EXT(crosscall_ppc64):
    25  	// Start with standard C stack frame layout and linkage
    26  	mflr	%r0
    27  	std	%r0, 16(%r1)	// Save LR in caller's frame
    28  	std	%r2, 24(%r1)	// Save TOC in caller's frame
    29  	bl	saveregs
    30  	stdu	%r1, -296(%r1)
    31  
    32  	// Set up Go ABI constant registers
    33  	bl	_cgo_reginit
    34  	nop
    35  
    36  	// Restore g pointer (r30 in Go ABI, which may have been clobbered by C)
    37  	mr	%r30, %r4
    38  
    39  	// Call fn
    40  	mr	%r12, %r3
    41  	mtctr	%r3
    42  	bctrl
    43  
    44  	addi	%r1, %r1, 296
    45  	bl	restoreregs
    46  	ld	%r2, 24(%r1)
    47  	ld	%r0, 16(%r1)
    48  	mtlr	%r0
    49  	blr
    50  
    51  saveregs:
    52  	// Save callee-save registers
    53  	// O=-288; for R in %r{14..31}; do echo "\tstd\t$R, $O(%r1)"; ((O+=8)); done; for F in f{14..31}; do echo "\tstfd\t$F, $O(%r1)"; ((O+=8)); done
    54  	std	%r14, -288(%r1)
    55  	std	%r15, -280(%r1)
    56  	std	%r16, -272(%r1)
    57  	std	%r17, -264(%r1)
    58  	std	%r18, -256(%r1)
    59  	std	%r19, -248(%r1)
    60  	std	%r20, -240(%r1)
    61  	std	%r21, -232(%r1)
    62  	std	%r22, -224(%r1)
    63  	std	%r23, -216(%r1)
    64  	std	%r24, -208(%r1)
    65  	std	%r25, -200(%r1)
    66  	std	%r26, -192(%r1)
    67  	std	%r27, -184(%r1)
    68  	std	%r28, -176(%r1)
    69  	std	%r29, -168(%r1)
    70  	std	%r30, -160(%r1)
    71  	std	%r31, -152(%r1)
    72  	stfd	%f14, -144(%r1)
    73  	stfd	%f15, -136(%r1)
    74  	stfd	%f16, -128(%r1)
    75  	stfd	%f17, -120(%r1)
    76  	stfd	%f18, -112(%r1)
    77  	stfd	%f19, -104(%r1)
    78  	stfd	%f20, -96(%r1)
    79  	stfd	%f21, -88(%r1)
    80  	stfd	%f22, -80(%r1)
    81  	stfd	%f23, -72(%r1)
    82  	stfd	%f24, -64(%r1)
    83  	stfd	%f25, -56(%r1)
    84  	stfd	%f26, -48(%r1)
    85  	stfd	%f27, -40(%r1)
    86  	stfd	%f28, -32(%r1)
    87  	stfd	%f29, -24(%r1)
    88  	stfd	%f30, -16(%r1)
    89  	stfd	%f31, -8(%r1)
    90  
    91  	blr
    92  
    93  restoreregs:
    94  	// O=-288; for R in %r{14..31}; do echo "\tld\t$R, $O(%r1)"; ((O+=8)); done; for F in %f{14..31}; do echo "\tlfd\t$F, $O(%r1)"; ((O+=8)); done
    95  	ld	%r14, -288(%r1)
    96  	ld	%r15, -280(%r1)
    97  	ld	%r16, -272(%r1)
    98  	ld	%r17, -264(%r1)
    99  	ld	%r18, -256(%r1)
   100  	ld	%r19, -248(%r1)
   101  	ld	%r20, -240(%r1)
   102  	ld	%r21, -232(%r1)
   103  	ld	%r22, -224(%r1)
   104  	ld	%r23, -216(%r1)
   105  	ld	%r24, -208(%r1)
   106  	ld	%r25, -200(%r1)
   107  	ld	%r26, -192(%r1)
   108  	ld	%r27, -184(%r1)
   109  	ld	%r28, -176(%r1)
   110  	ld	%r29, -168(%r1)
   111  	ld	%r30, -160(%r1)
   112  	ld	%r31, -152(%r1)
   113  	lfd	%f14, -144(%r1)
   114  	lfd	%f15, -136(%r1)
   115  	lfd	%f16, -128(%r1)
   116  	lfd	%f17, -120(%r1)
   117  	lfd	%f18, -112(%r1)
   118  	lfd	%f19, -104(%r1)
   119  	lfd	%f20, -96(%r1)
   120  	lfd	%f21, -88(%r1)
   121  	lfd	%f22, -80(%r1)
   122  	lfd	%f23, -72(%r1)
   123  	lfd	%f24, -64(%r1)
   124  	lfd	%f25, -56(%r1)
   125  	lfd	%f26, -48(%r1)
   126  	lfd	%f27, -40(%r1)
   127  	lfd	%f28, -32(%r1)
   128  	lfd	%f29, -24(%r1)
   129  	lfd	%f30, -16(%r1)
   130  	lfd	%f31, -8(%r1)
   131  
   132  	blr
   133  
   134  
   135  #ifdef __ELF__
   136  .section .note.GNU-stack,"",%progbits
   137  #endif