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Add some clarifications

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This commit is contained in:
joerg 2011-03-10 17:38:30 +00:00
parent 7567d86ea5
commit 7197db08bd
1 changed files with 9 additions and 3 deletions
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12
libexec/ld.elf_so/README.TLS
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@ -13,8 +13,13 @@ everything using ucontext_t. Debug support depends on getting the data from
ucontext_t, so the second option is possibly required.
(3) _lwp_setprivate(2) has to update the same register as
_lwp_makecontext. cpu_lwp_setprivate has to call _lwp_setprivate(2) to
reflect the kernel view. cpu_switch has to update the mapping.
_lwp_makecontext uses for the private area pointer. Normally
cpu_lwp_setprivate is provided by MD to reflect the kernel view and
enabled by defining __HAVE_CPU_LWP_SETPRIVATE in machine/types.h.
cpu_setmcontext is responsible for keeping the MI l_private field
synchronised by calling lwp_setprivate as needed.
cpu_switchto has to update the mapping.
_lwp_setprivate is used for the initial thread, all other threads
created by libpthread use _lwp_makecontext for this purpose.
@ -24,7 +29,8 @@ TLS offset computation. If such alternative entry points exist (currently
only i386), also add a weak reference to 0 in src/lib/libc/tls/tls.c.
The generic implementation can be found in tls.c and is used with
__HAVE_COMMON___TLS_GET_ADDR. It depends on ___lwp_getprivate_fast.
__HAVE_COMMON___TLS_GET_ADDR. It depends on ___lwp_getprivate_fast
(see below).
(5) Implement the necessary relocation records in mdreloc.c. There are
typically three relocation types found in dynamic binaries: