about summary refs log tree commit diff
path: root/sysdeps/x86_64/dl-trampoline.S
blob: 6523c92945a59e6a5eefa3cfb2e0c58dfa99fd44 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/* PLT trampolines.  x86-64 version.
   Copyright (C) 2004, 2005, 2007, 2009, 2011 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <config.h>
#include <sysdep.h>
#include <link-defines.h>

	.text
	.globl _dl_runtime_resolve
	.type _dl_runtime_resolve, @function
	.align 16
	cfi_startproc
_dl_runtime_resolve:
	cfi_adjust_cfa_offset(16) # Incorporate PLT
	subq $56,%rsp
	cfi_adjust_cfa_offset(56)
	movq %rax,(%rsp)	# Preserve registers otherwise clobbered.
	movq %rcx, 8(%rsp)
	movq %rdx, 16(%rsp)
	movq %rsi, 24(%rsp)
	movq %rdi, 32(%rsp)
	movq %r8, 40(%rsp)
	movq %r9, 48(%rsp)
	movq 64(%rsp), %rsi	# Copy args pushed by PLT in register.
	movq 56(%rsp), %rdi	# %rdi: link_map, %rsi: reloc_index
	call _dl_fixup		# Call resolver.
	movq %rax, %r11		# Save return value
	movq 48(%rsp), %r9	# Get register content back.
	movq 40(%rsp), %r8
	movq 32(%rsp), %rdi
	movq 24(%rsp), %rsi
	movq 16(%rsp), %rdx
	movq 8(%rsp), %rcx
	movq (%rsp), %rax
	addq $72, %rsp		# Adjust stack(PLT did 2 pushes)
	cfi_adjust_cfa_offset(-72)
	jmp *%r11		# Jump to function address.
	cfi_endproc
	.size _dl_runtime_resolve, .-_dl_runtime_resolve


#ifndef PROF
	.globl _dl_runtime_profile
	.type _dl_runtime_profile, @function
	.align 16
	cfi_startproc

_dl_runtime_profile:
	cfi_adjust_cfa_offset(16) # Incorporate PLT
	/* The La_x86_64_regs data structure pointed to by the
	   fourth paramater must be 16-byte aligned.  This must
	   be explicitly enforced.  We have the set up a dynamically
	   sized stack frame.  %rbx points to the top half which
	   has a fixed size and preserves the original stack pointer.  */

	subq $32, %rsp		# Allocate the local storage.
	cfi_adjust_cfa_offset(32)
	movq %rbx, (%rsp)
	cfi_rel_offset(%rbx, 0)

	/* On the stack:
		56(%rbx)	parameter #1
		48(%rbx)	return address

		40(%rbx)	reloc index
		32(%rbx)	link_map

		24(%rbx)	La_x86_64_regs pointer
		16(%rbx)	framesize
		 8(%rbx)	rax
		  (%rbx)	rbx
	*/

	movq %rax, 8(%rsp)
	movq %rsp, %rbx
	cfi_def_cfa_register(%rbx)

	/* Actively align the La_x86_64_regs structure.  */
	andq $0xfffffffffffffff0, %rsp
# ifdef HAVE_AVX_SUPPORT
	/* sizeof(La_x86_64_regs).  Need extra space for 8 SSE registers
	   to detect if any xmm0-xmm7 registers are changed by audit
	   module.  */
	subq $(LR_SIZE + XMM_SIZE*8), %rsp
# else
	subq $LR_SIZE, %rsp		# sizeof(La_x86_64_regs)
# endif
	movq %rsp, 24(%rbx)

	/* Fill the La_x86_64_regs structure.  */
	movq %rdx, LR_RDX_OFFSET(%rsp)
	movq %r8,  LR_R8_OFFSET(%rsp)
	movq %r9,  LR_R9_OFFSET(%rsp)
	movq %rcx, LR_RCX_OFFSET(%rsp)
	movq %rsi, LR_RSI_OFFSET(%rsp)
	movq %rdi, LR_RDI_OFFSET(%rsp)
	movq %rbp, LR_RBP_OFFSET(%rsp)

	leaq 48(%rbx), %rax
	movq %rax, LR_RSP_OFFSET(%rsp)

	/* We always store the XMM registers even if AVX is available.
	   This is to provide backward binary compatility for existing
	   audit modules.  */
	movaps %xmm0,		   (LR_XMM_OFFSET)(%rsp)
	movaps %xmm1, (LR_XMM_OFFSET +   XMM_SIZE)(%rsp)
	movaps %xmm2, (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp)
	movaps %xmm3, (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp)
	movaps %xmm4, (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp)
	movaps %xmm5, (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp)
	movaps %xmm6, (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp)
	movaps %xmm7, (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp)

# ifdef HAVE_AVX_SUPPORT
	.data
L(have_avx):
	.zero 4
	.size L(have_avx), 4
	.previous

	cmpl	$0, L(have_avx)(%rip)
	jne	1f
	movq	%rbx, %r11		# Save rbx
	movl	$1, %eax
	cpuid
	movq	%r11,%rbx		# Restore rbx
	xorl	%eax, %eax
	// AVX and XSAVE supported?
	andl	$((1 << 28) | (1 << 27)), %ecx
	cmpl	$((1 << 28) | (1 << 27)), %ecx
	jne	2f
	xorl	%ecx, %ecx
	// Get XFEATURE_ENABLED_MASK
	xgetbv
	andl	$0x6, %eax
2:	subl	$0x5, %eax
	movl	%eax, L(have_avx)(%rip)
	cmpl	$0, %eax

1:	js	L(no_avx)

#  define RESTORE_AVX
#  define MORE_CODE
#  include "dl-trampoline.h"

	.align 16
L(no_avx):
# endif

# undef RESTORE_AVX
# include "dl-trampoline.h"

	cfi_endproc
	.size _dl_runtime_profile, .-_dl_runtime_profile
#endif


#ifdef SHARED
	.globl _dl_x86_64_save_sse
	.type _dl_x86_64_save_sse, @function
	.align 16
	cfi_startproc
_dl_x86_64_save_sse:
# ifdef HAVE_AVX_SUPPORT
	cmpl	$0, L(have_avx)(%rip)
	jne	1f
	movq	%rbx, %r11		# Save rbx
	movl	$1, %eax
	cpuid
	movq	%r11,%rbx		# Restore rbx
	xorl	%eax, %eax
	// AVX and XSAVE supported?
	andl	$((1 << 28) | (1 << 27)), %ecx
	cmpl	$((1 << 28) | (1 << 27)), %ecx
	jne	2f
	xorl	%ecx, %ecx
	// Get XFEATURE_ENABLED_MASK
	xgetbv
	andl	$0x6, %eax
	cmpl	$0x6, %eax
	// Nonzero if SSE and AVX state saving is enabled.
	sete	%al
2:	leal	-1(%eax,%eax), %eax
	movl	%eax, L(have_avx)(%rip)
	cmpl	$0, %eax

1:	js	L(no_avx5)

#  define YMM_SIZE 32
	vmovdqa %ymm0, %fs:RTLD_SAVESPACE_SSE+0*YMM_SIZE
	vmovdqa %ymm1, %fs:RTLD_SAVESPACE_SSE+1*YMM_SIZE
	vmovdqa %ymm2, %fs:RTLD_SAVESPACE_SSE+2*YMM_SIZE
	vmovdqa %ymm3, %fs:RTLD_SAVESPACE_SSE+3*YMM_SIZE
	vmovdqa %ymm4, %fs:RTLD_SAVESPACE_SSE+4*YMM_SIZE
	vmovdqa %ymm5, %fs:RTLD_SAVESPACE_SSE+5*YMM_SIZE
	vmovdqa %ymm6, %fs:RTLD_SAVESPACE_SSE+6*YMM_SIZE
	vmovdqa %ymm7, %fs:RTLD_SAVESPACE_SSE+7*YMM_SIZE
	ret
L(no_avx5):
# endif
	movdqa	%xmm0, %fs:RTLD_SAVESPACE_SSE+0*XMM_SIZE
	movdqa	%xmm1, %fs:RTLD_SAVESPACE_SSE+1*XMM_SIZE
	movdqa	%xmm2, %fs:RTLD_SAVESPACE_SSE+2*XMM_SIZE
	movdqa	%xmm3, %fs:RTLD_SAVESPACE_SSE+3*XMM_SIZE
	movdqa	%xmm4, %fs:RTLD_SAVESPACE_SSE+4*XMM_SIZE
	movdqa	%xmm5, %fs:RTLD_SAVESPACE_SSE+5*XMM_SIZE
	movdqa	%xmm6, %fs:RTLD_SAVESPACE_SSE+6*XMM_SIZE
	movdqa	%xmm7, %fs:RTLD_SAVESPACE_SSE+7*XMM_SIZE
	ret
	cfi_endproc
	.size _dl_x86_64_save_sse, .-_dl_x86_64_save_sse


	.globl _dl_x86_64_restore_sse
	.type _dl_x86_64_restore_sse, @function
	.align 16
	cfi_startproc
_dl_x86_64_restore_sse:
# ifdef HAVE_AVX_SUPPORT
	cmpl	$0, L(have_avx)(%rip)
	js	L(no_avx6)

	vmovdqa %fs:RTLD_SAVESPACE_SSE+0*YMM_SIZE, %ymm0
	vmovdqa %fs:RTLD_SAVESPACE_SSE+1*YMM_SIZE, %ymm1
	vmovdqa %fs:RTLD_SAVESPACE_SSE+2*YMM_SIZE, %ymm2
	vmovdqa %fs:RTLD_SAVESPACE_SSE+3*YMM_SIZE, %ymm3
	vmovdqa %fs:RTLD_SAVESPACE_SSE+4*YMM_SIZE, %ymm4
	vmovdqa %fs:RTLD_SAVESPACE_SSE+5*YMM_SIZE, %ymm5
	vmovdqa %fs:RTLD_SAVESPACE_SSE+6*YMM_SIZE, %ymm6
	vmovdqa %fs:RTLD_SAVESPACE_SSE+7*YMM_SIZE, %ymm7
	ret
L(no_avx6):
# endif
	movdqa	%fs:RTLD_SAVESPACE_SSE+0*XMM_SIZE, %xmm0
	movdqa	%fs:RTLD_SAVESPACE_SSE+1*XMM_SIZE, %xmm1
	movdqa	%fs:RTLD_SAVESPACE_SSE+2*XMM_SIZE, %xmm2
	movdqa	%fs:RTLD_SAVESPACE_SSE+3*XMM_SIZE, %xmm3
	movdqa	%fs:RTLD_SAVESPACE_SSE+4*XMM_SIZE, %xmm4
	movdqa	%fs:RTLD_SAVESPACE_SSE+5*XMM_SIZE, %xmm5
	movdqa	%fs:RTLD_SAVESPACE_SSE+6*XMM_SIZE, %xmm6
	movdqa	%fs:RTLD_SAVESPACE_SSE+7*XMM_SIZE, %xmm7
	ret
	cfi_endproc
	.size _dl_x86_64_restore_sse, .-_dl_x86_64_restore_sse
#endif