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Add support for multiple threads in core files

Browse source 
_UCD_select_thread() lets you select the active thread from
the core file and _UCD_get_num_threads() tells you how many there are.
This commit is contained in:
Alexander Larsson 2012-03-23 21:00:30 +01:00 committed by Arun Sharma
parent d627481783
commit 0c0ea23cf2
3 changed files with 60 additions and 27 deletions
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2
include/libunwind-coredump.h
View file

@ -40,6 +40,8 @@ struct UCD_info;
extern struct UCD_info *_UCD_create(const char *filename);
extern void _UCD_destroy(struct UCD_info *);
extern int _UCD_get_num_threads(struct UCD_info *);
extern void _UCD_select_thread(struct UCD_info *, int);
extern pid_t _UCD_get_pid(struct UCD_info *);
extern int _UCD_get_cursig(struct UCD_info *);
extern int _UCD_add_backing_file_at_segment(struct UCD_info *, int phdr_no, const char *filename);

83
src/coredump/_UCD_create.c
View file

@ -206,6 +206,9 @@ _UCD_create(const char *filename)
Debug(2, "phdr[%03d]: type:%d", i, cur->p_type);
if (cur->p_type == PT_NOTE)
{
unsigned char *p, *note_end;
unsigned n_threads;
ui->note_phdr = malloc(cur->p_filesz);
if (lseek(fd, cur->p_offset, SEEK_SET) != (off_t)cur->p_offset
|| (uoff_t)read(fd, ui->note_phdr, cur->p_filesz) != cur->p_filesz
@ -215,33 +218,46 @@ _UCD_create(const char *filename)
goto err;
}
/* Note is three 32-bit words: */
/* Elf32_Word n_namesz; Length of the note's name */
/* Elf32_Word n_descsz; Length of the note's descriptor */
/* Elf32_Word n_type; Type */
/* followed by name (padded to 32 bits(?)) and then descr */
Elf32_Nhdr *note_hdr = ui->note_phdr;
if (cur->p_filesz >= 3*4
&& note_hdr->n_type == NT_PRSTATUS
&& cur->p_filesz >= (3*4 + note_hdr->n_namesz + note_hdr->n_descsz + sizeof(*ui->prstatus))
)
note_end = (unsigned char *)ui->note_phdr + cur->p_filesz;
/* Count number of threads */
n_threads = 0;
p = ui->note_phdr;
while (p + sizeof (Elf32_Nhdr) <= note_end)
{
ui->prstatus = (void*) ((((long)note_hdr + sizeof(*note_hdr) + note_hdr->n_namesz) + 3) & ~3L);
#if 0
printf("pid:%d\n", ui->prstatus->pr_pid);
printf("ebx:%ld\n", (long)ui->prstatus->pr_reg[0]);
printf("ecx:%ld\n", (long)ui->prstatus->pr_reg[1]);
printf("edx:%ld\n", (long)ui->prstatus->pr_reg[2]);
printf("esi:%ld\n", (long)ui->prstatus->pr_reg[3]);
printf("edi:%ld\n", (long)ui->prstatus->pr_reg[4]);
printf("ebp:%ld\n", (long)ui->prstatus->pr_reg[5]);
printf("eax:%ld\n", (long)ui->prstatus->pr_reg[6]);
printf("xds:%ld\n", (long)ui->prstatus->pr_reg[7]);
printf("xes:%ld\n", (long)ui->prstatus->pr_reg[8]);
printf("xfs:%ld\n", (long)ui->prstatus->pr_reg[9]);
printf("xgs:%ld\n", (long)ui->prstatus->pr_reg[10]);
printf("orig_eax:%ld\n", (long)ui->prstatus->pr_reg[11]);
#endif
Elf32_Nhdr *note_hdr = (Elf32_Nhdr *)p;
unsigned char *p_next;
p_next = p + sizeof (Elf32_Nhdr) + ((note_hdr->n_namesz + 3) & ~3L) + note_hdr->n_descsz;
if (p_next >= note_end)
break;
if (note_hdr->n_type == NT_PRSTATUS)
n_threads++;
p = p_next;
}
ui->n_threads = n_threads;
ui->threads = malloc(sizeof (void *) * n_threads);
n_threads = 0;
p = ui->note_phdr;
while (p + sizeof (Elf32_Nhdr) <= note_end)
{
Elf32_Nhdr *note_hdr = (Elf32_Nhdr *)p;
unsigned char *p_next;
p_next = p + sizeof (Elf32_Nhdr) + ((note_hdr->n_namesz + 3) & ~3L) + note_hdr->n_descsz;
if (p_next >= note_end)
break;
if (note_hdr->n_type == NT_PRSTATUS)
ui->threads[n_threads++] = (void*) ((((long)note_hdr + sizeof(*note_hdr) + note_hdr->n_namesz) + 3) & ~3L);
p = p_next;
}
}
if (cur->p_type == PT_LOAD)
@ -263,12 +279,14 @@ _UCD_create(const char *filename)
cur++;
}
if (!ui->prstatus)
if (ui->n_threads == 0)
{
Debug(0, "No NT_PRSTATUS note found in '%s'\n", filename);
goto err;
}
ui->prstatus = ui->threads[0];
return ui;
err:
@ -276,6 +294,17 @@ _UCD_create(const char *filename)
return NULL;
}
int _UCD_get_num_threads(struct UCD_info *ui)
{
return ui->n_threads;
}
void _UCD_select_thread(struct UCD_info *ui, int n)
{
if (n >= 0 && n < ui->n_threads)
ui->prstatus = ui->threads[n];
}
pid_t _UCD_get_pid(struct UCD_info *ui)
{
return ui->prstatus->pr_pid;

2
src/coredump/_UCD_internal.h
View file

@ -91,6 +91,8 @@ struct UCD_info
unsigned phdrs_count;
void *note_phdr; /* allocated or NULL */
struct PRSTATUS_STRUCT *prstatus; /* points inside note_phdr */
int n_threads;
struct PRSTATUS_STRUCT **threads;
struct elf_dyn_info edi;
};