diff options
Diffstat (limited to 'gdb/i386-linux-nat.c')
| -rw-r--r-- | gdb/i386-linux-nat.c | 75 |
1 files changed, 40 insertions, 35 deletions
diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c index dbf91b7..e7a85fa 100644 --- a/gdb/i386-linux-nat.c +++ b/gdb/i386-linux-nat.c @@ -687,41 +687,6 @@ i386_linux_dr_set (int regnum, unsigned long value) perror_with_name ("Couldn't write debug register"); } -/* Called by libthread_db. Return's a pointer to the thread local - storage (or it's descriptor). */ -extern ps_err_e -ps_get_thread_area(const struct ps_prochandle *ph, - lwpid_t lwpid, int idx, void **base) -{ - /* NOTE: cagney/2003-08-26: The definition of this buffer is found - in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x - 4 byte integers in size: "entry_number", "base_addr", "limit", - and a bunch of status bits. - - The values returned by this ptrace call should be part of the - regcache buffer, and ps_get_thread_area should channel its - request through the regcache. That way remote targets could - provide the value using the remote protocol and not this direct - call. - - Is this function needed? I'm guessing that the "base" is the - address of a a descriptor that libthread_db uses to find the - thread local address base that GDB needs. Perhaphs that - descriptor is defined by the ABI. Anyway, given that - libthread_db calls this function without prompting (gdb - requesting tls base) I guess it needs info in there anyway. */ - unsigned int desc[4]; - gdb_assert (sizeof (int) == 4); -#define PTRACE_GET_THREAD_AREA 25 - - if (ptrace (PTRACE_GET_THREAD_AREA, - lwpid, (void *) idx, (unsigned long) &desc) < 0) - return PS_ERR; - - *(int *)base = desc[1]; - return PS_OK; -} - void i386_linux_dr_set_control (unsigned long control) { @@ -751,6 +716,46 @@ i386_linux_dr_get_status (void) } +/* Called by libthread_db. Returns a pointer to the thread local + storage (or its descriptor). */ + +ps_err_e +ps_get_thread_area (const struct ps_prochandle *ph, + lwpid_t lwpid, int idx, void **base) +{ + /* NOTE: cagney/2003-08-26: The definition of this buffer is found + in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x + 4 byte integers in size: `entry_number', `base_addr', `limit', + and a bunch of status bits. + + The values returned by this ptrace call should be part of the + regcache buffer, and ps_get_thread_area should channel its + request through the regcache. That way remote targets could + provide the value using the remote protocol and not this direct + call. + + Is this function needed? I'm guessing that the `base' is the + address of a a descriptor that libthread_db uses to find the + thread local address base that GDB needs. Perhaphs that + descriptor is defined by the ABI. Anyway, given that + libthread_db calls this function without prompting (gdb + requesting tls base) I guess it needs info in there anyway. */ + unsigned int desc[4]; + gdb_assert (sizeof (int) == 4); + +#ifndef PTRACE_GET_THREAD_AREA +#define PTRACE_GET_THREAD_AREA 25 +#endif + + if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, + (void *) idx, (unsigned long) &desc) < 0) + return PS_ERR; + + *(int *)base = desc[1]; + return PS_OK; +} + + /* Interpreting register set info found in core files. */ /* Provide registers to GDB from a core file. |