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authorJeff Dike <jdike@addtoit.com>2007-05-06 17:51:48 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 15:13:04 -0400
commit16dd07bc6404c8da0bdfeb7a5cde4e4a63991c00 (patch)
treede8401aeebfe1bbdaecaff3b81d92196c50c85d7 /arch/um
parent3ec704e6660aa58505110a50102e57cdb9daa044 (diff)
uml: more page fault path trimming
More trimming of the page fault path. Permissions are passed around in a single int rather than one bit per int. The permission values are copied from libc so that they can be passed to mmap and mprotect without any further conversion. The register sets used by do_syscall_stub and copy_context_skas0 are initialized once, at boot time, rather than once per call. wait_stub_done checks whether it is getting the signals it expects by comparing the wait status to a mask containing bits for the signals of interest rather than comparing individually to the signal numbers. It also has one check for a wait failure instead of two. The caller is expected to do the initial continue of the stub. This gets rid of an argument and some logic. The fname argument is gone, as that can be had from a stack trace. user_signal() is collapsed into userspace() as it is basically one or two lines of code afterwards. The physical memory remapping stuff is gone, as it is unused. flush_tlb_page is inlined. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/include/os.h6
-rw-r--r--arch/um/include/tlb.h8
-rw-r--r--arch/um/kernel/physmem.c228
-rw-r--r--arch/um/kernel/skas/tlb.c21
-rw-r--r--arch/um/kernel/tlb.c42
-rw-r--r--arch/um/os-Linux/skas/mem.c51
-rw-r--r--arch/um/os-Linux/skas/process.c122
-rw-r--r--arch/um/os-Linux/skas/trap.c17
-rw-r--r--arch/um/sys-i386/user-offsets.c9
-rw-r--r--arch/um/sys-x86_64/user-offsets.c5
10 files changed, 145 insertions, 364 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index e11bdcd8afc2..688d181b5f8a 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -300,13 +300,12 @@ extern long syscall_stub_data(struct mm_id * mm_idp,
300 unsigned long *data, int data_count, 300 unsigned long *data, int data_count,
301 void **addr, void **stub_addr); 301 void **addr, void **stub_addr);
302extern int map(struct mm_id * mm_idp, unsigned long virt, 302extern int map(struct mm_id * mm_idp, unsigned long virt,
303 unsigned long len, int r, int w, int x, int phys_fd, 303 unsigned long len, int prot, int phys_fd,
304 unsigned long long offset, int done, void **data); 304 unsigned long long offset, int done, void **data);
305extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len, 305extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
306 int done, void **data); 306 int done, void **data);
307extern int protect(struct mm_id * mm_idp, unsigned long addr, 307extern int protect(struct mm_id * mm_idp, unsigned long addr,
308 unsigned long len, int r, int w, int x, int done, 308 unsigned long len, unsigned int prot, int done, void **data);
309 void **data);
310 309
311/* skas/process.c */ 310/* skas/process.c */
312extern int is_skas_winch(int pid, int fd, void *data); 311extern int is_skas_winch(int pid, int fd, void *data);
@@ -342,7 +341,6 @@ extern void maybe_sigio_broken(int fd, int read);
342 341
343/* skas/trap */ 342/* skas/trap */
344extern void sig_handler_common_skas(int sig, void *sc_ptr); 343extern void sig_handler_common_skas(int sig, void *sc_ptr);
345extern void user_signal(int sig, union uml_pt_regs *regs, int pid);
346 344
347/* sys-x86_64/prctl.c */ 345/* sys-x86_64/prctl.c */
348extern int os_arch_prctl(int pid, int code, unsigned long *addr); 346extern int os_arch_prctl(int pid, int code, unsigned long *addr);
diff --git a/arch/um/include/tlb.h b/arch/um/include/tlb.h
index 8efc1e0f1b84..bcd1a4afb842 100644
--- a/arch/um/include/tlb.h
+++ b/arch/um/include/tlb.h
@@ -14,9 +14,7 @@ struct host_vm_op {
14 struct { 14 struct {
15 unsigned long addr; 15 unsigned long addr;
16 unsigned long len; 16 unsigned long len;
17 unsigned int r:1; 17 unsigned int prot;
18 unsigned int w:1;
19 unsigned int x:1;
20 int fd; 18 int fd;
21 __u64 offset; 19 __u64 offset;
22 } mmap; 20 } mmap;
@@ -27,9 +25,7 @@ struct host_vm_op {
27 struct { 25 struct {
28 unsigned long addr; 26 unsigned long addr;
29 unsigned long len; 27 unsigned long len;
30 unsigned int r:1; 28 unsigned int prot;
31 unsigned int w:1;
32 unsigned int x:1;
33 } mprotect; 29 } mprotect;
34 } u; 30 } u;
35}; 31};
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index df1ad3ba130c..3ba6e4c841da 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -21,229 +21,8 @@
21#include "kern.h" 21#include "kern.h"
22#include "init.h" 22#include "init.h"
23 23
24struct phys_desc {
25 struct rb_node rb;
26 int fd;
27 __u64 offset;
28 void *virt;
29 unsigned long phys;
30 struct list_head list;
31};
32
33static struct rb_root phys_mappings = RB_ROOT;
34
35static struct rb_node **find_rb(void *virt)
36{
37 struct rb_node **n = &phys_mappings.rb_node;
38 struct phys_desc *d;
39
40 while(*n != NULL){
41 d = rb_entry(*n, struct phys_desc, rb);
42 if(d->virt == virt)
43 return n;
44
45 if(d->virt > virt)
46 n = &(*n)->rb_left;
47 else
48 n = &(*n)->rb_right;
49 }
50
51 return n;
52}
53
54static struct phys_desc *find_phys_mapping(void *virt)
55{
56 struct rb_node **n = find_rb(virt);
57
58 if(*n == NULL)
59 return NULL;
60
61 return rb_entry(*n, struct phys_desc, rb);
62}
63
64static void insert_phys_mapping(struct phys_desc *desc)
65{
66 struct rb_node **n = find_rb(desc->virt);
67
68 if(*n != NULL)
69 panic("Physical remapping for %p already present",
70 desc->virt);
71
72 rb_link_node(&desc->rb, rb_parent(*n), n);
73 rb_insert_color(&desc->rb, &phys_mappings);
74}
75
76LIST_HEAD(descriptor_mappings);
77
78struct desc_mapping {
79 int fd;
80 struct list_head list;
81 struct list_head pages;
82};
83
84static struct desc_mapping *find_mapping(int fd)
85{
86 struct desc_mapping *desc;
87 struct list_head *ele;
88
89 list_for_each(ele, &descriptor_mappings){
90 desc = list_entry(ele, struct desc_mapping, list);
91 if(desc->fd == fd)
92 return desc;
93 }
94
95 return NULL;
96}
97
98static struct desc_mapping *descriptor_mapping(int fd)
99{
100 struct desc_mapping *desc;
101
102 desc = find_mapping(fd);
103 if(desc != NULL)
104 return desc;
105
106 desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
107 if(desc == NULL)
108 return NULL;
109
110 *desc = ((struct desc_mapping)
111 { .fd = fd,
112 .list = LIST_HEAD_INIT(desc->list),
113 .pages = LIST_HEAD_INIT(desc->pages) });
114 list_add(&desc->list, &descriptor_mappings);
115
116 return desc;
117}
118
119int physmem_subst_mapping(void *virt, int fd, __u64 offset, int w)
120{
121 struct desc_mapping *fd_maps;
122 struct phys_desc *desc;
123 unsigned long phys;
124 int err;
125
126 fd_maps = descriptor_mapping(fd);
127 if(fd_maps == NULL)
128 return -ENOMEM;
129
130 phys = __pa(virt);
131 desc = find_phys_mapping(virt);
132 if(desc != NULL)
133 panic("Address 0x%p is already substituted\n", virt);
134
135 err = -ENOMEM;
136 desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
137 if(desc == NULL)
138 goto out;
139
140 *desc = ((struct phys_desc)
141 { .fd = fd,
142 .offset = offset,
143 .virt = virt,
144 .phys = __pa(virt),
145 .list = LIST_HEAD_INIT(desc->list) });
146 insert_phys_mapping(desc);
147
148 list_add(&desc->list, &fd_maps->pages);
149
150 virt = (void *) ((unsigned long) virt & PAGE_MASK);
151 err = os_map_memory(virt, fd, offset, PAGE_SIZE, 1, w, 0);
152 if(!err)
153 goto out;
154
155 rb_erase(&desc->rb, &phys_mappings);
156 kfree(desc);
157 out:
158 return err;
159}
160
161static int physmem_fd = -1; 24static int physmem_fd = -1;
162 25
163static void remove_mapping(struct phys_desc *desc)
164{
165 void *virt = desc->virt;
166 int err;
167
168 rb_erase(&desc->rb, &phys_mappings);
169 list_del(&desc->list);
170 kfree(desc);
171
172 err = os_map_memory(virt, physmem_fd, __pa(virt), PAGE_SIZE, 1, 1, 0);
173 if(err)
174 panic("Failed to unmap block device page from physical memory, "
175 "errno = %d", -err);
176}
177
178int physmem_remove_mapping(void *virt)
179{
180 struct phys_desc *desc;
181
182 virt = (void *) ((unsigned long) virt & PAGE_MASK);
183 desc = find_phys_mapping(virt);
184 if(desc == NULL)
185 return 0;
186
187 remove_mapping(desc);
188 return 1;
189}
190
191void physmem_forget_descriptor(int fd)
192{
193 struct desc_mapping *desc;
194 struct phys_desc *page;
195 struct list_head *ele, *next;
196 __u64 offset;
197 void *addr;
198 int err;
199
200 desc = find_mapping(fd);
201 if(desc == NULL)
202 return;
203
204 list_for_each_safe(ele, next, &desc->pages){
205 page = list_entry(ele, struct phys_desc, list);
206 offset = page->offset;
207 addr = page->virt;
208 remove_mapping(page);
209 err = os_seek_file(fd, offset);
210 if(err)
211 panic("physmem_forget_descriptor - failed to seek "
212 "to %lld in fd %d, error = %d\n",
213 offset, fd, -err);
214 err = os_read_file(fd, addr, PAGE_SIZE);
215 if(err < 0)
216 panic("physmem_forget_descriptor - failed to read "
217 "from fd %d to 0x%p, error = %d\n",
218 fd, addr, -err);
219 }
220
221 list_del(&desc->list);
222 kfree(desc);
223}
224
225EXPORT_SYMBOL(physmem_forget_descriptor);
226EXPORT_SYMBOL(physmem_remove_mapping);
227EXPORT_SYMBOL(physmem_subst_mapping);
228
229void arch_free_page(struct page *page, int order)
230{
231 void *virt;
232 int i;
233
234 for(i = 0; i < (1 << order); i++){
235 virt = __va(page_to_phys(page + i));
236 physmem_remove_mapping(virt);
237 }
238}
239
240int is_remapped(void *virt)
241{
242 struct phys_desc *desc = find_phys_mapping(virt);
243
244 return desc != NULL;
245}
246
247/* Changed during early boot */ 26/* Changed during early boot */
248unsigned long high_physmem; 27unsigned long high_physmem;
249 28
@@ -350,14 +129,9 @@ void setup_physmem(unsigned long start, unsigned long reserve_end,
350 129
351int phys_mapping(unsigned long phys, __u64 *offset_out) 130int phys_mapping(unsigned long phys, __u64 *offset_out)
352{ 131{
353 struct phys_desc *desc = find_phys_mapping(__va(phys & PAGE_MASK));
354 int fd = -1; 132 int fd = -1;
355 133
356 if(desc != NULL){ 134 if(phys < physmem_size){
357 fd = desc->fd;
358 *offset_out = desc->offset;
359 }
360 else if(phys < physmem_size){
361 fd = physmem_fd; 135 fd = physmem_fd;
362 *offset_out = phys; 136 *offset_out = phys;
363 } 137 }
diff --git a/arch/um/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
index c43901aa9368..b3d722ddde31 100644
--- a/arch/um/kernel/skas/tlb.c
+++ b/arch/um/kernel/skas/tlb.c
@@ -27,9 +27,9 @@ static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
27 switch(op->type){ 27 switch(op->type){
28 case MMAP: 28 case MMAP:
29 ret = map(&mmu->skas.id, op->u.mmap.addr, 29 ret = map(&mmu->skas.id, op->u.mmap.addr,
30 op->u.mmap.len, op->u.mmap.r, op->u.mmap.w, 30 op->u.mmap.len, op->u.mmap.prot,
31 op->u.mmap.x, op->u.mmap.fd, 31 op->u.mmap.fd, op->u.mmap.offset, finished,
32 op->u.mmap.offset, finished, flush); 32 flush);
33 break; 33 break;
34 case MUNMAP: 34 case MUNMAP:
35 ret = unmap(&mmu->skas.id, op->u.munmap.addr, 35 ret = unmap(&mmu->skas.id, op->u.munmap.addr,
@@ -37,8 +37,7 @@ static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
37 break; 37 break;
38 case MPROTECT: 38 case MPROTECT:
39 ret = protect(&mmu->skas.id, op->u.mprotect.addr, 39 ret = protect(&mmu->skas.id, op->u.mprotect.addr,
40 op->u.mprotect.len, op->u.mprotect.r, 40 op->u.mprotect.len, op->u.mprotect.prot,
41 op->u.mprotect.w, op->u.mprotect.x,
42 finished, flush); 41 finished, flush);
43 break; 42 break;
44 default: 43 default:
@@ -102,10 +101,10 @@ void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
102 pte_t *pte; 101 pte_t *pte;
103 struct mm_struct *mm = vma->vm_mm; 102 struct mm_struct *mm = vma->vm_mm;
104 void *flush = NULL; 103 void *flush = NULL;
105 int r, w, x, err = 0; 104 int r, w, x, prot, err = 0;
106 struct mm_id *mm_id; 105 struct mm_id *mm_id;
107 106
108 pgd = pgd_offset(vma->vm_mm, address); 107 pgd = pgd_offset(mm, address);
109 if(!pgd_present(*pgd)) 108 if(!pgd_present(*pgd))
110 goto kill; 109 goto kill;
111 110
@@ -130,19 +129,21 @@ void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
130 } 129 }
131 130
132 mm_id = &mm->context.skas.id; 131 mm_id = &mm->context.skas.id;
132 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
133 (x ? UM_PROT_EXEC : 0));
133 if(pte_newpage(*pte)){ 134 if(pte_newpage(*pte)){
134 if(pte_present(*pte)){ 135 if(pte_present(*pte)){
135 unsigned long long offset; 136 unsigned long long offset;
136 int fd; 137 int fd;
137 138
138 fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset); 139 fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
139 err = map(mm_id, address, PAGE_SIZE, r, w, x, fd, 140 err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
140 offset, 1, &flush); 141 1, &flush);
141 } 142 }
142 else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush); 143 else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
143 } 144 }
144 else if(pte_newprot(*pte)) 145 else if(pte_newprot(*pte))
145 err = protect(mm_id, address, PAGE_SIZE, r, w, x, 1, &flush); 146 err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
146 147
147 if(err) 148 if(err)
148 goto kill; 149 goto kill;
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 4a39d50d2d62..8a8d52851443 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -17,7 +17,7 @@
17#include "os.h" 17#include "os.h"
18 18
19static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len, 19static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
20 int r, int w, int x, struct host_vm_op *ops, int *index, 20 unsigned int prot, struct host_vm_op *ops, int *index,
21 int last_filled, union mm_context *mmu, void **flush, 21 int last_filled, union mm_context *mmu, void **flush,
22 int (*do_ops)(union mm_context *, struct host_vm_op *, 22 int (*do_ops)(union mm_context *, struct host_vm_op *,
23 int, int, void **)) 23 int, int, void **))
@@ -31,8 +31,7 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
31 last = &ops[*index]; 31 last = &ops[*index];
32 if((last->type == MMAP) && 32 if((last->type == MMAP) &&
33 (last->u.mmap.addr + last->u.mmap.len == virt) && 33 (last->u.mmap.addr + last->u.mmap.len == virt) &&
34 (last->u.mmap.r == r) && (last->u.mmap.w == w) && 34 (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
35 (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
36 (last->u.mmap.offset + last->u.mmap.len == offset)){ 35 (last->u.mmap.offset + last->u.mmap.len == offset)){
37 last->u.mmap.len += len; 36 last->u.mmap.len += len;
38 return 0; 37 return 0;
@@ -48,9 +47,7 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
48 .u = { .mmap = { 47 .u = { .mmap = {
49 .addr = virt, 48 .addr = virt,
50 .len = len, 49 .len = len,
51 .r = r, 50 .prot = prot,
52 .w = w,
53 .x = x,
54 .fd = fd, 51 .fd = fd,
55 .offset = offset } 52 .offset = offset }
56 } }); 53 } });
@@ -87,8 +84,8 @@ static int add_munmap(unsigned long addr, unsigned long len,
87 return ret; 84 return ret;
88} 85}
89 86
90static int add_mprotect(unsigned long addr, unsigned long len, int r, int w, 87static int add_mprotect(unsigned long addr, unsigned long len,
91 int x, struct host_vm_op *ops, int *index, 88 unsigned int prot, struct host_vm_op *ops, int *index,
92 int last_filled, union mm_context *mmu, void **flush, 89 int last_filled, union mm_context *mmu, void **flush,
93 int (*do_ops)(union mm_context *, struct host_vm_op *, 90 int (*do_ops)(union mm_context *, struct host_vm_op *,
94 int, int, void **)) 91 int, int, void **))
@@ -100,8 +97,7 @@ static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
100 last = &ops[*index]; 97 last = &ops[*index];
101 if((last->type == MPROTECT) && 98 if((last->type == MPROTECT) &&
102 (last->u.mprotect.addr + last->u.mprotect.len == addr) && 99 (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
103 (last->u.mprotect.r == r) && (last->u.mprotect.w == w) && 100 (last->u.mprotect.prot == prot)){
104 (last->u.mprotect.x == x)){
105 last->u.mprotect.len += len; 101 last->u.mprotect.len += len;
106 return 0; 102 return 0;
107 } 103 }
@@ -116,9 +112,7 @@ static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
116 .u = { .mprotect = { 112 .u = { .mprotect = {
117 .addr = addr, 113 .addr = addr,
118 .len = len, 114 .len = len,
119 .r = r, 115 .prot = prot } } });
120 .w = w,
121 .x = x } } });
122 return ret; 116 return ret;
123} 117}
124 118
@@ -133,7 +127,7 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
133 void **)) 127 void **))
134{ 128{
135 pte_t *pte; 129 pte_t *pte;
136 int r, w, x, ret = 0; 130 int r, w, x, prot, ret = 0;
137 131
138 pte = pte_offset_kernel(pmd, addr); 132 pte = pte_offset_kernel(pmd, addr);
139 do { 133 do {
@@ -146,19 +140,19 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
146 } else if (!pte_dirty(*pte)) { 140 } else if (!pte_dirty(*pte)) {
147 w = 0; 141 w = 0;
148 } 142 }
143 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
144 (x ? UM_PROT_EXEC : 0));
149 if(force || pte_newpage(*pte)){ 145 if(force || pte_newpage(*pte)){
150 if(pte_present(*pte)) 146 if(pte_present(*pte))
151 ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK, 147 ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
152 PAGE_SIZE, r, w, x, ops, 148 PAGE_SIZE, prot, ops, op_index,
153 op_index, last_op, mmu, flush, 149 last_op, mmu, flush, do_ops);
154 do_ops);
155 else ret = add_munmap(addr, PAGE_SIZE, ops, op_index, 150 else ret = add_munmap(addr, PAGE_SIZE, ops, op_index,
156 last_op, mmu, flush, do_ops); 151 last_op, mmu, flush, do_ops);
157 } 152 }
158 else if(pte_newprot(*pte)) 153 else if(pte_newprot(*pte))
159 ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops, 154 ret = add_mprotect(addr, PAGE_SIZE, prot, ops, op_index,
160 op_index, last_op, mmu, flush, 155 last_op, mmu, flush, do_ops);
161 do_ops);
162 *pte = pte_mkuptodate(*pte); 156 *pte = pte_mkuptodate(*pte);
163 } while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret)); 157 } while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret));
164 return ret; 158 return ret;
@@ -377,14 +371,6 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
377 return(pte_offset_map(pmd, addr)); 371 return(pte_offset_map(pmd, addr));
378} 372}
379 373
380void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
381{
382 address &= PAGE_MASK;
383
384 CHOOSE_MODE(flush_tlb_range(vma, address, address + PAGE_SIZE),
385 flush_tlb_page_skas(vma, address));
386}
387
388void flush_tlb_all(void) 374void flush_tlb_all(void)
389{ 375{
390 flush_tlb_mm(current->mm); 376 flush_tlb_mm(current->mm);
diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
index af0790719b77..8e490fff3d47 100644
--- a/arch/um/os-Linux/skas/mem.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -24,10 +24,11 @@
24#include "uml-config.h" 24#include "uml-config.h"
25#include "sysdep/ptrace.h" 25#include "sysdep/ptrace.h"
26#include "sysdep/stub.h" 26#include "sysdep/stub.h"
27#include "init.h"
27 28
28extern unsigned long batch_syscall_stub, __syscall_stub_start; 29extern unsigned long batch_syscall_stub, __syscall_stub_start;
29 30
30extern void wait_stub_done(int pid, int sig, char * fname); 31extern void wait_stub_done(int pid);
31 32
32static inline unsigned long *check_init_stack(struct mm_id * mm_idp, 33static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
33 unsigned long *stack) 34 unsigned long *stack)
@@ -39,6 +40,19 @@ static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
39 return stack; 40 return stack;
40} 41}
41 42
43static unsigned long syscall_regs[MAX_REG_NR];
44
45static int __init init_syscall_regs(void)
46{
47 get_safe_registers(syscall_regs, NULL);
48 syscall_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
49 ((unsigned long) &batch_syscall_stub -
50 (unsigned long) &__syscall_stub_start);
51 return 0;
52}
53
54__initcall(init_syscall_regs);
55
42extern int proc_mm; 56extern int proc_mm;
43 57
44int single_count = 0; 58int single_count = 0;
@@ -47,12 +61,11 @@ int multi_op_count = 0;
47 61
48static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr) 62static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
49{ 63{
50 unsigned long regs[MAX_REG_NR];
51 int n, i; 64 int n, i;
52 long ret, offset; 65 long ret, offset;
53 unsigned long * data; 66 unsigned long * data;
54 unsigned long * syscall; 67 unsigned long * syscall;
55 int pid = mm_idp->u.pid; 68 int err, pid = mm_idp->u.pid;
56 69
57 if(proc_mm) 70 if(proc_mm)
58#warning Need to look up userspace_pid by cpu 71#warning Need to look up userspace_pid by cpu
@@ -60,21 +73,21 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
60 73
61 multi_count++; 74 multi_count++;
62 75
63 get_safe_registers(regs, NULL); 76 n = ptrace_setregs(pid, syscall_regs);
64 regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
65 ((unsigned long) &batch_syscall_stub -
66 (unsigned long) &__syscall_stub_start);
67
68 n = ptrace_setregs(pid, regs);
69 if(n < 0){ 77 if(n < 0){
70 printk("Registers - \n"); 78 printk("Registers - \n");
71 for(i = 0; i < MAX_REG_NR; i++) 79 for(i = 0; i < MAX_REG_NR; i++)
72 printk("\t%d\t0x%lx\n", i, regs[i]); 80 printk("\t%d\t0x%lx\n", i, syscall_regs[i]);
73 panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n", 81 panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
74 -n); 82 -n);
75 } 83 }
76 84
77 wait_stub_done(pid, 0, "do_syscall_stub"); 85 err = ptrace(PTRACE_CONT, pid, 0, 0);
86 if(err)
87 panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
88 errno);
89
90 wait_stub_done(pid);
78 91
79 /* When the stub stops, we find the following values on the 92 /* When the stub stops, we find the following values on the
80 * beginning of the stack: 93 * beginning of the stack:
@@ -176,14 +189,10 @@ long syscall_stub_data(struct mm_id * mm_idp,
176 return 0; 189 return 0;
177} 190}
178 191
179int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, 192int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
180 int r, int w, int x, int phys_fd, unsigned long long offset, 193 int phys_fd, unsigned long long offset, int done, void **data)
181 int done, void **data)
182{ 194{
183 int prot, ret; 195 int ret;
184
185 prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
186 (x ? PROT_EXEC : 0);
187 196
188 if(proc_mm){ 197 if(proc_mm){
189 struct proc_mm_op map; 198 struct proc_mm_op map;
@@ -253,13 +262,11 @@ int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
253} 262}
254 263
255int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len, 264int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
256 int r, int w, int x, int done, void **data) 265 unsigned int prot, int done, void **data)
257{ 266{
258 struct proc_mm_op protect; 267 struct proc_mm_op protect;
259 int prot, ret; 268 int ret;
260 269
261 prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
262 (x ? PROT_EXEC : 0);
263 if(proc_mm){ 270 if(proc_mm){
264 int fd = mm_idp->u.mm_fd; 271 int fd = mm_idp->u.mm_fd;
265 272
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 1f39f2bf7ce9..5c088a55396c 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -34,6 +34,7 @@
34#include "process.h" 34#include "process.h"
35#include "longjmp.h" 35#include "longjmp.h"
36#include "kern_constants.h" 36#include "kern_constants.h"
37#include "as-layout.h"
37 38
38int is_skas_winch(int pid, int fd, void *data) 39int is_skas_winch(int pid, int fd, void *data)
39{ 40{
@@ -60,37 +61,42 @@ static int ptrace_dump_regs(int pid)
60 return 0; 61 return 0;
61} 62}
62 63
63void wait_stub_done(int pid, int sig, char * fname) 64/*
65 * Signals that are OK to receive in the stub - we'll just continue it.
66 * SIGWINCH will happen when UML is inside a detached screen.
67 */
68#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH))
69
70/* Signals that the stub will finish with - anything else is an error */
71#define STUB_DONE_MASK ((1 << SIGUSR1) | (1 << SIGTRAP))
72
73void wait_stub_done(int pid)
64{ 74{
65 int n, status, err; 75 int n, status, err;
66 76
67 do { 77 while(1){
68 if ( sig != -1 ) {
69 err = ptrace(PTRACE_CONT, pid, 0, sig);
70 if(err)
71 panic("%s : continue failed, errno = %d\n",
72 fname, errno);
73 }
74 sig = 0;
75
76 CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); 78 CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
77 } while((n >= 0) && WIFSTOPPED(status) && 79 if((n < 0) || !WIFSTOPPED(status))
78 ((WSTOPSIG(status) == SIGVTALRM) || 80 goto bad_wait;
79 /* running UML inside a detached screen can cause 81
80 * SIGWINCHes 82 if(((1 << WSTOPSIG(status)) & STUB_SIG_MASK) == 0)
81 */ 83 break;
82 (WSTOPSIG(status) == SIGWINCH))); 84
83 85 err = ptrace(PTRACE_CONT, pid, 0, 0);
84 if((n < 0) || !WIFSTOPPED(status) ||
85 (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
86 err = ptrace_dump_regs(pid);
87 if(err) 86 if(err)
88 printk("Failed to get registers from stub, " 87 panic("wait_stub_done : continue failed, errno = %d\n",
89 "errno = %d\n", -err); 88 errno);
90 panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
91 "pid = %d, n = %d, errno = %d, status = 0x%x\n",
92 fname, pid, n, errno, status);
93 } 89 }
90
91 if(((1 << WSTOPSIG(status)) & STUB_DONE_MASK) != 0)
92 return;
93
94bad_wait:
95 err = ptrace_dump_regs(pid);
96 if(err)
97 printk("Failed to get registers from stub, errno = %d\n", -err);
98 panic("wait_stub_done : failed to wait for SIGUSR1/SIGTRAP, pid = %d, "
99 "n = %d, errno = %d, status = 0x%x\n", pid, n, errno, status);
94} 100}
95 101
96extern unsigned long current_stub_stack(void); 102extern unsigned long current_stub_stack(void);
@@ -112,7 +118,11 @@ void get_skas_faultinfo(int pid, struct faultinfo * fi)
112 sizeof(struct ptrace_faultinfo)); 118 sizeof(struct ptrace_faultinfo));
113 } 119 }
114 else { 120 else {
115 wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo"); 121 err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
122 if(err)
123 panic("Failed to continue stub, pid = %d, errno = %d\n",
124 pid, errno);
125 wait_stub_done(pid);
116 126
117 /* faultinfo is prepared by the stub-segv-handler at start of 127 /* faultinfo is prepared by the stub-segv-handler at start of
118 * the stub stack page. We just have to copy it. 128 * the stub stack page. We just have to copy it.
@@ -304,10 +314,13 @@ void userspace(union uml_pt_regs *regs)
304 UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */ 314 UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
305 315
306 if(WIFSTOPPED(status)){ 316 if(WIFSTOPPED(status)){
307 switch(WSTOPSIG(status)){ 317 int sig = WSTOPSIG(status);
318 switch(sig){
308 case SIGSEGV: 319 case SIGSEGV:
309 if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo) 320 if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo){
310 user_signal(SIGSEGV, regs, pid); 321 get_skas_faultinfo(pid, &regs->skas.faultinfo);
322 (*sig_info[SIGSEGV])(SIGSEGV, regs);
323 }
311 else handle_segv(pid, regs); 324 else handle_segv(pid, regs);
312 break; 325 break;
313 case SIGTRAP + 0x80: 326 case SIGTRAP + 0x80:
@@ -322,11 +335,13 @@ void userspace(union uml_pt_regs *regs)
322 case SIGBUS: 335 case SIGBUS:
323 case SIGFPE: 336 case SIGFPE:
324 case SIGWINCH: 337 case SIGWINCH:
325 user_signal(WSTOPSIG(status), regs, pid); 338 block_signals();
339 (*sig_info[sig])(sig, regs);
340 unblock_signals();
326 break; 341 break;
327 default: 342 default:
328 printk("userspace - child stopped with signal " 343 printk("userspace - child stopped with signal "
329 "%d\n", WSTOPSIG(status)); 344 "%d\n", sig);
330 } 345 }
331 pid = userspace_pid[0]; 346 pid = userspace_pid[0];
332 interrupt_end(); 347 interrupt_end();
@@ -338,11 +353,29 @@ void userspace(union uml_pt_regs *regs)
338 } 353 }
339} 354}
340 355
356static unsigned long thread_regs[MAX_REG_NR];
357static unsigned long thread_fp_regs[HOST_FP_SIZE];
358
359static int __init init_thread_regs(void)
360{
361 get_safe_registers(thread_regs, thread_fp_regs);
362 /* Set parent's instruction pointer to start of clone-stub */
363 thread_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
364 (unsigned long) stub_clone_handler -
365 (unsigned long) &__syscall_stub_start;
366 thread_regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE -
367 sizeof(void *);
368#ifdef __SIGNAL_FRAMESIZE
369 thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
370#endif
371 return 0;
372}
373
374__initcall(init_thread_regs);
375
341int copy_context_skas0(unsigned long new_stack, int pid) 376int copy_context_skas0(unsigned long new_stack, int pid)
342{ 377{
343 int err; 378 int err;
344 unsigned long regs[MAX_REG_NR];
345 unsigned long fp_regs[HOST_FP_SIZE];
346 unsigned long current_stack = current_stub_stack(); 379 unsigned long current_stack = current_stub_stack();
347 struct stub_data *data = (struct stub_data *) current_stack; 380 struct stub_data *data = (struct stub_data *) current_stack;
348 struct stub_data *child_data = (struct stub_data *) new_stack; 381 struct stub_data *child_data = (struct stub_data *) new_stack;
@@ -357,23 +390,12 @@ int copy_context_skas0(unsigned long new_stack, int pid)
357 .timer = ((struct itimerval) 390 .timer = ((struct itimerval)
358 { { 0, 1000000 / hz() }, 391 { { 0, 1000000 / hz() },
359 { 0, 1000000 / hz() }})}); 392 { 0, 1000000 / hz() }})});
360 get_safe_registers(regs, fp_regs); 393 err = ptrace_setregs(pid, thread_regs);
361
362 /* Set parent's instruction pointer to start of clone-stub */
363 regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
364 (unsigned long) stub_clone_handler -
365 (unsigned long) &__syscall_stub_start;
366 regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE -
367 sizeof(void *);
368#ifdef __SIGNAL_FRAMESIZE
369 regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
370#endif
371 err = ptrace_setregs(pid, regs);
372 if(err < 0) 394 if(err < 0)
373 panic("copy_context_skas0 : PTRACE_SETREGS failed, " 395 panic("copy_context_skas0 : PTRACE_SETREGS failed, "
374 "pid = %d, errno = %d\n", pid, -err); 396 "pid = %d, errno = %d\n", pid, -err);
375 397
376 err = ptrace_setfpregs(pid, fp_regs); 398 err = ptrace_setfpregs(pid, thread_fp_regs);
377 if(err < 0) 399 if(err < 0)
378 panic("copy_context_skas0 : PTRACE_SETFPREGS failed, " 400 panic("copy_context_skas0 : PTRACE_SETFPREGS failed, "
379 "pid = %d, errno = %d\n", pid, -err); 401 "pid = %d, errno = %d\n", pid, -err);
@@ -384,7 +406,11 @@ int copy_context_skas0(unsigned long new_stack, int pid)
384 /* Wait, until parent has finished its work: read child's pid from 406 /* Wait, until parent has finished its work: read child's pid from
385 * parent's stack, and check, if bad result. 407 * parent's stack, and check, if bad result.
386 */ 408 */
387 wait_stub_done(pid, 0, "copy_context_skas0"); 409 err = ptrace(PTRACE_CONT, pid, 0, 0);
410 if(err)
411 panic("Failed to continue new process, pid = %d, "
412 "errno = %d\n", pid, errno);
413 wait_stub_done(pid);
388 414
389 pid = data->err; 415 pid = data->err;
390 if(pid < 0) 416 if(pid < 0)
@@ -394,7 +420,7 @@ int copy_context_skas0(unsigned long new_stack, int pid)
394 /* Wait, until child has finished too: read child's result from 420 /* Wait, until child has finished too: read child's result from
395 * child's stack and check it. 421 * child's stack and check it.
396 */ 422 */
397 wait_stub_done(pid, -1, "copy_context_skas0"); 423 wait_stub_done(pid);
398 if (child_data->err != UML_CONFIG_STUB_DATA) 424 if (child_data->err != UML_CONFIG_STUB_DATA)
399 panic("copy_context_skas0 - stub-child reports error %ld\n", 425 panic("copy_context_skas0 - stub-child reports error %ld\n",
400 child_data->err); 426 child_data->err);
diff --git a/arch/um/os-Linux/skas/trap.c b/arch/um/os-Linux/skas/trap.c
index 5110eff51b90..3b600c2e63b8 100644
--- a/arch/um/os-Linux/skas/trap.c
+++ b/arch/um/os-Linux/skas/trap.c
@@ -64,20 +64,3 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
64 errno = save_errno; 64 errno = save_errno;
65 r->skas.is_user = save_user; 65 r->skas.is_user = save_user;
66} 66}
67
68extern int ptrace_faultinfo;
69
70void user_signal(int sig, union uml_pt_regs *regs, int pid)
71{
72 void (*handler)(int, union uml_pt_regs *);
73 int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
74 (sig == SIGILL) || (sig == SIGTRAP));
75
76 if (segv)
77 get_skas_faultinfo(pid, &regs->skas.faultinfo);
78
79 handler = sig_info[sig];
80 handler(sig, (union uml_pt_regs *) regs);
81
82 unblock_signals();
83}
diff --git a/arch/um/sys-i386/user-offsets.c b/arch/um/sys-i386/user-offsets.c
index ee42c27abd3a..29118cf5ff25 100644
--- a/arch/um/sys-i386/user-offsets.c
+++ b/arch/um/sys-i386/user-offsets.c
@@ -1,9 +1,10 @@
1#include <stdio.h> 1#include <stdio.h>
2#include <stddef.h>
2#include <signal.h> 3#include <signal.h>
4#include <sys/poll.h>
5#include <sys/mman.h>
3#include <asm/ptrace.h> 6#include <asm/ptrace.h>
4#include <asm/user.h> 7#include <asm/user.h>
5#include <stddef.h>
6#include <sys/poll.h>
7 8
8#define DEFINE(sym, val) \ 9#define DEFINE(sym, val) \
9 asm volatile("\n->" #sym " %0 " #val : : "i" (val)) 10 asm volatile("\n->" #sym " %0 " #val : : "i" (val))
@@ -72,4 +73,8 @@ void foo(void)
72 DEFINE(UM_POLLIN, POLLIN); 73 DEFINE(UM_POLLIN, POLLIN);
73 DEFINE(UM_POLLPRI, POLLPRI); 74 DEFINE(UM_POLLPRI, POLLPRI);
74 DEFINE(UM_POLLOUT, POLLOUT); 75 DEFINE(UM_POLLOUT, POLLOUT);
76
77 DEFINE(UM_PROT_READ, PROT_READ);
78 DEFINE(UM_PROT_WRITE, PROT_WRITE);
79 DEFINE(UM_PROT_EXEC, PROT_EXEC);
75} 80}
diff --git a/arch/um/sys-x86_64/user-offsets.c b/arch/um/sys-x86_64/user-offsets.c
index 7bb532567c47..0d5fd764c21f 100644
--- a/arch/um/sys-x86_64/user-offsets.c
+++ b/arch/um/sys-x86_64/user-offsets.c
@@ -2,6 +2,7 @@
2#include <stddef.h> 2#include <stddef.h>
3#include <signal.h> 3#include <signal.h>
4#include <sys/poll.h> 4#include <sys/poll.h>
5#include <sys/mman.h>
5#define __FRAME_OFFSETS 6#define __FRAME_OFFSETS
6#include <asm/ptrace.h> 7#include <asm/ptrace.h>
7#include <asm/types.h> 8#include <asm/types.h>
@@ -93,4 +94,8 @@ void foo(void)
93 DEFINE(UM_POLLIN, POLLIN); 94 DEFINE(UM_POLLIN, POLLIN);
94 DEFINE(UM_POLLPRI, POLLPRI); 95 DEFINE(UM_POLLPRI, POLLPRI);
95 DEFINE(UM_POLLOUT, POLLOUT); 96 DEFINE(UM_POLLOUT, POLLOUT);
97
98 DEFINE(UM_PROT_READ, PROT_READ);
99 DEFINE(UM_PROT_WRITE, PROT_WRITE);
100 DEFINE(UM_PROT_EXEC, PROT_EXEC);
96} 101}
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-20 20:30:57 -0400