aboutsummaryrefslogtreecommitdiffstats
path: root/main/xen/0001-ipxe-dont-clobber-ebp.patch
blob: 2d2fe2f818ca419408a222eaa6ac04fc23d75622 (plain)
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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
From 65289dab529e8aefe6ef0e365739e05a8a574e0e Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Mon, 21 Oct 2013 14:22:17 +0000
Subject: [PATCH] ipxe: dont clobber ebp

build fix
https://bugs.gentoo.org/show_bug.cgi?id=487254
---
 .../etherboot/patches/no-clobber-ebp.patch         | 220 +++++++++++++++++++++
 .../etherboot/patches/no-clobber-ebp2.patch        |  26 +++
 tools/firmware/etherboot/patches/series            |   2 +
 3 files changed, 248 insertions(+)
 create mode 100644 tools/firmware/etherboot/patches/no-clobber-ebp.patch
 create mode 100644 tools/firmware/etherboot/patches/no-clobber-ebp2.patch

diff --git a/tools/firmware/etherboot/patches/no-clobber-ebp.patch b/tools/firmware/etherboot/patches/no-clobber-ebp.patch
new file mode 100644
index 0000000..bbd8c06
--- /dev/null
+++ b/tools/firmware/etherboot/patches/no-clobber-ebp.patch
@@ -0,0 +1,220 @@
+From cba22d36b77da53890bd65fdadd0e63925687af0 Mon Sep 17 00:00:00 2001
+From: Michael Brown <mcb30@ipxe.org>
+Date: Wed, 25 Sep 2013 12:55:46 +0100
+Subject: [PATCH] [build] Work around bug in gcc >= 4.8
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf8
+Content-Transfer-Encoding: 8bit
+
+Commit 238050d ("[build] Work around bug in gcc >= 4.8") works around
+one instance of a bug in recent versions of gcc, in which "ebp" cannot
+be specified within an asm clobber list.
+
+Some versions of gcc seem to exhibit the same bug on other points in
+the codebase.  Fix by changing all instances of "ebp" in a clobber
+list to use the push/pop %ebp workaround instead.
+
+Originally-implemented-by: Víctor Román Archidona <contacto@victor-roman.es>
+Signed-off-by: Michael Brown <mcb30@ipxe.org>
+---
+ src/arch/i386/drivers/net/undiload.c          |    8 +++++---
+ src/arch/i386/firmware/pcbios/bios_console.c  |    9 +++++----
+ src/arch/i386/image/bootsector.c              |    7 ++++++-
+ src/arch/i386/image/elfboot.c                 |    7 ++++---
+ src/arch/i386/image/nbi.c                     |   16 ++++++++++------
+ src/arch/i386/interface/pxeparent/pxeparent.c |    8 +++++---
+ 6 files changed, 35 insertions(+), 20 deletions(-)
+
+diff --git a/src/arch/i386/drivers/net/undiload.c b/src/arch/i386/drivers/net/undiload.c
+index f0f15e6..77134dc 100644
+--- a/src/arch/i386/drivers/net/undiload.c
++++ b/src/arch/i386/drivers/net/undiload.c
+@@ -103,13 +103,15 @@ int undi_load ( struct undi_device *undi, struct undi_rom *undirom ) {
+ 
+ 	/* Call loader */
+ 	undi_loader_entry = undirom->loader_entry;
+-	__asm__ __volatile__ ( REAL_CODE ( "pushw %%ds\n\t"
++	__asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t" /* gcc bug */
++					   "pushw %%ds\n\t"
+ 					   "pushw %%ax\n\t"
+ 					   "lcall *undi_loader_entry\n\t"
+-					   "addw $4, %%sp\n\t" )
++					   "popl %%ebp\n\t" /* discard */
++					   "popl %%ebp\n\t" /* gcc bug */ )
+ 			       : "=a" ( exit )
+ 			       : "a" ( __from_data16 ( &undi_loader ) )
+-			       : "ebx", "ecx", "edx", "esi", "edi", "ebp" );
++			       : "ebx", "ecx", "edx", "esi", "edi" );
+ 
+ 	if ( exit != PXENV_EXIT_SUCCESS ) {
+ 		/* Clear entry point */
+diff --git a/src/arch/i386/firmware/pcbios/bios_console.c b/src/arch/i386/firmware/pcbios/bios_console.c
+index 213ebd9..79e4370 100644
+--- a/src/arch/i386/firmware/pcbios/bios_console.c
++++ b/src/arch/i386/firmware/pcbios/bios_console.c
+@@ -167,7 +167,8 @@ static void bios_putchar ( int character ) {
+ 		return;
+ 
+ 	/* Print character with attribute */
+-	__asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
++	__asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t" /* gcc bug */
++					   "sti\n\t"
+ 					   /* Skip non-printable characters */
+ 					   "cmpb $0x20, %%al\n\t"
+ 					   "jb 1f\n\t"
+@@ -188,11 +189,11 @@ static void bios_putchar ( int character ) {
+ 					   "xorw %%bx, %%bx\n\t"
+ 					   "movb $0x0e, %%ah\n\t"
+ 					   "int $0x10\n\t"
+-					   "cli\n\t" )
++					   "cli\n\t"
++					   "popl %%ebp\n\t" /* gcc bug */ )
+ 			       : "=a" ( discard_a ), "=b" ( discard_b ),
+ 			         "=c" ( discard_c )
+-			       : "a" ( character ), "b" ( bios_attr )
+-			       : "ebp" );
++			       : "a" ( character ), "b" ( bios_attr ) );
+ }
+ 
+ /**
+diff --git a/src/arch/i386/image/bootsector.c b/src/arch/i386/image/bootsector.c
+index ab3cf94..cb164fd 100644
+--- a/src/arch/i386/image/bootsector.c
++++ b/src/arch/i386/image/bootsector.c
+@@ -80,6 +80,8 @@ int call_bootsector ( unsigned int segment, unsigned int offset,
+ 					   "movw %%ss, %%ax\n\t"
+ 					   "movw %%ax, %%cs:saved_ss\n\t"
+ 					   "movw %%sp, %%cs:saved_sp\n\t"
++					   /* Save frame pointer (gcc bug) */
++					   "movl %%ebp, %%cs:saved_ebp\n\t"
+ 					   /* Jump to boot sector */
+ 					   "pushw %%bx\n\t"
+ 					   "pushw %%di\n\t"
+@@ -99,11 +101,14 @@ int call_bootsector ( unsigned int segment, unsigned int offset,
+ 					   "sti\n\t"
+ 					   "lret\n\t"
+ 					   /* Preserved variables */
++					   "\nsaved_ebp: .long 0\n\t"
+ 					   "\nsaved_ss: .word 0\n\t"
+ 					   "\nsaved_sp: .word 0\n\t"
+ 					   "\nsaved_retaddr: .word 0\n\t"
+ 					   /* Boot failure return point */
+ 					   "\nbootsector_exec_fail:\n\t"
++					   /* Restore frame pointer (gcc bug) */
++					   "movl %%cs:saved_ebp, %%ebp\n\t"
+ 					   /* Restore stack pointer */
+ 					   "movw %%cs:saved_ss, %%ax\n\t"
+ 					   "movw %%ax, %%ss\n\t"
+@@ -114,7 +119,7 @@ int call_bootsector ( unsigned int segment, unsigned int offset,
+ 			         "=d" ( discard_d )
+ 			       : "b" ( segment ), "D" ( offset ),
+ 			         "d" ( drive )
+-			       : "eax", "ecx", "esi", "ebp" );
++			       : "eax", "ecx", "esi" );
+ 
+ 	DBG ( "Booted disk returned via INT 18 or 19\n" );
+ 
+diff --git a/src/arch/i386/image/elfboot.c b/src/arch/i386/image/elfboot.c
+index a867a95..0f6957f 100644
+--- a/src/arch/i386/image/elfboot.c
++++ b/src/arch/i386/image/elfboot.c
+@@ -60,10 +60,11 @@ static int elfboot_exec ( struct image *image ) {
+ 
+ 	/* Jump to OS with flat physical addressing */
+ 	DBGC ( image, "ELF %p starting execution at %lx\n", image, entry );
+-	__asm__ __volatile__ ( PHYS_CODE ( "call *%%edi\n\t" )
++	__asm__ __volatile__ ( PHYS_CODE ( "pushl %%ebp\n\t" /* gcc bug */
++					   "call *%%edi\n\t"
++					   "popl %%ebp\n\t" /* gcc bug */ )
+ 			       : : "D" ( entry )
+-			       : "eax", "ebx", "ecx", "edx", "esi", "ebp",
+-			         "memory" );
++			       : "eax", "ebx", "ecx", "edx", "esi", "memory" );
+ 
+ 	DBGC ( image, "ELF %p returned\n", image );
+ 
+diff --git a/src/arch/i386/image/nbi.c b/src/arch/i386/image/nbi.c
+index d3e523e..9904614 100644
+--- a/src/arch/i386/image/nbi.c
++++ b/src/arch/i386/image/nbi.c
+@@ -248,7 +248,8 @@ static int nbi_boot16 ( struct image *image, struct imgheader *imgheader ) {
+ 	       imgheader->execaddr.segoff.offset );
+ 
+ 	__asm__ __volatile__ (
+-		REAL_CODE ( "pushw %%ds\n\t"	/* far pointer to bootp data */
++		REAL_CODE ( "pushl %%ebp\n\t"	/* gcc bug */
++			    "pushw %%ds\n\t"	/* far pointer to bootp data */
+ 			    "pushw %%bx\n\t"
+ 			    "pushl %%esi\n\t"	/* location */
+ 			    "pushw %%cs\n\t"	/* lcall execaddr */
+@@ -258,13 +259,14 @@ static int nbi_boot16 ( struct image *image, struct imgheader *imgheader ) {
+ 			    "pushl %%edi\n\t"
+ 			    "lret\n\t"
+ 			    "\n2:\n\t"
+-			    "addw $8,%%sp\n\t"	/* clean up stack */ )
++			    "addw $8,%%sp\n\t"	/* clean up stack */
++			    "popl %%ebp\n\t"	/* gcc bug */ )
+ 		: "=a" ( rc ), "=D" ( discard_D ), "=S" ( discard_S ),
+ 		  "=b" ( discard_b )
+ 		: "D" ( imgheader->execaddr.segoff ),
+ 		  "S" ( imgheader->location ),
+ 		  "b" ( __from_data16 ( basemem_packet ) )
+-		: "ecx", "edx", "ebp" );
++		: "ecx", "edx" );
+ 
+ 	return rc;
+ }
+@@ -288,11 +290,13 @@ static int nbi_boot32 ( struct image *image, struct imgheader *imgheader ) {
+ 
+ 	/* Jump to OS with flat physical addressing */
+ 	__asm__ __volatile__ (
+-		PHYS_CODE ( "pushl %%ebx\n\t" /* bootp data */
++		PHYS_CODE ( "pushl %%ebp\n\t" /* gcc bug */
++			    "pushl %%ebx\n\t" /* bootp data */
+ 			    "pushl %%esi\n\t" /* imgheader */
+ 			    "pushl %%eax\n\t" /* loaderinfo */
+ 			    "call *%%edi\n\t"
+-			    "addl $12, %%esp\n\t" /* clean up stack */ )
++			    "addl $12, %%esp\n\t" /* clean up stack */
++			    "popl %%ebp\n\t" /* gcc bug */ )
+ 		: "=a" ( rc ), "=D" ( discard_D ), "=S" ( discard_S ),
+ 		  "=b" ( discard_b )
+ 		: "D" ( imgheader->execaddr.linear ),
+@@ -300,7 +304,7 @@ static int nbi_boot32 ( struct image *image, struct imgheader *imgheader ) {
+ 			imgheader->location.offset ),
+ 		  "b" ( virt_to_phys ( basemem_packet ) ),
+ 		  "a" ( virt_to_phys ( &loaderinfo ) )
+-		: "ecx", "edx", "ebp", "memory" );
++		: "ecx", "edx", "memory" );
+ 
+ 	return rc;
+ }
+diff --git a/src/arch/i386/interface/pxeparent/pxeparent.c b/src/arch/i386/interface/pxeparent/pxeparent.c
+index b2c6ffb..9d2948c 100644
+--- a/src/arch/i386/interface/pxeparent/pxeparent.c
++++ b/src/arch/i386/interface/pxeparent/pxeparent.c
+@@ -143,16 +143,18 @@ int pxeparent_call ( SEGOFF16_t entry, unsigned int function,
+ 	/* Call real-mode entry point.  This calling convention will
+ 	 * work with both the !PXE and the PXENV+ entry points.
+ 	 */
+-	__asm__ __volatile__ ( REAL_CODE ( "pushw %%es\n\t"
++	__asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t" /* gcc bug */
++					   "pushw %%es\n\t"
+ 					   "pushw %%di\n\t"
+ 					   "pushw %%bx\n\t"
+ 					   "lcall *pxeparent_entry_point\n\t"
+-					   "addw $6, %%sp\n\t" )
++					   "addw $6, %%sp\n\t"
++					   "popl %%ebp\n\t" /* gcc bug */ )
+ 			       : "=a" ( exit ), "=b" ( discard_b ),
+ 			         "=D" ( discard_D )
+ 			       : "b" ( function ),
+ 			         "D" ( __from_data16 ( &pxeparent_params ) )
+-			       : "ecx", "edx", "esi", "ebp" );
++			       : "ecx", "edx", "esi" );
+ 
+ 	/* Determine return status code based on PXENV_EXIT and
+ 	 * PXENV_STATUS
+-- 
+1.7.9
+
diff --git a/tools/firmware/etherboot/patches/no-clobber-ebp2.patch b/tools/firmware/etherboot/patches/no-clobber-ebp2.patch
new file mode 100644
index 0000000..6b9ac07
--- /dev/null
+++ b/tools/firmware/etherboot/patches/no-clobber-ebp2.patch
@@ -0,0 +1,26 @@
+--- a/src/arch/i386/interface/pxe/pxe_call.c.orig
++++ b/src/arch/i386/interface/pxe/pxe_call.c
+@@ -265,11 +265,13 @@
+ 
+ 	/* Far call to PXE NBP */
+ 	__asm__ __volatile__ ( REAL_CODE ( "movw %%cx, %%es\n\t"
++					   "pushl %%ebp\n\t" /* gcc bug */
+ 					   "pushw %%es\n\t"
+ 					   "pushw %%di\n\t"
+ 					   "sti\n\t"
+ 					   "lcall $0, $0x7c00\n\t"
+-					   "addw $4, %%sp\n\t" )
++					   "addw $4, %%sp\n\t"
++					   "popl %%ebp\n\t" ) /* gcc bug */
+ 			       : "=a" ( rc ), "=b" ( discard_b ),
+ 				 "=c" ( discard_c ), "=d" ( discard_d ),
+ 				 "=D" ( discard_D )
+@@ -277,7 +279,7 @@
+ 			         "c" ( rm_cs ),
+ 			         "d" ( virt_to_phys ( &pxenv ) ),
+ 				 "D" ( __from_text16 ( &ppxe ) )
+-			       : "esi", "ebp", "memory" );
++			       : "esi", "memory" );
+ 
+ 	return rc;
+ }
diff --git a/tools/firmware/etherboot/patches/series b/tools/firmware/etherboot/patches/series
index 5bd7df8..154e65b 100644
--- a/tools/firmware/etherboot/patches/series
+++ b/tools/firmware/etherboot/patches/series
@@ -2,3 +2,5 @@ boot_prompt_option.patch
 build_fix_1.patch
 build_fix_2.patch
 build_fix_3.patch
+no-clobber-ebp.patch
+no-clobber-ebp2.patch
-- 
1.8.4.1