#if 0
/* Use this method if GOT address not yet set up. */
- asm ("\
- b,l 1f,%0
- depi 0,31,2,%0
-1: addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 8),%0
- ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 12)(%%r1),%0"
+ asm (
+" b,l 1f,%0\n"
+" depi 0,31,2,%0\n"
+"1: addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 8),%0\n"
+" ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 12)(%%r1),%0\n"
: "=r" (dynamic) : : "r1");
#else
/* This works because we already have our GOT address available. */
{
Elf32_Addr dynamic, dynamic_linkaddress;
- asm ("\
- b,l 1f,%0
- depi 0,31,2,%0
-1: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%0
- ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%%r1),%1
- addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%0
- ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%%r1),%0"
+ asm (
+" b,l 1f,%0\n"
+" depi 0,31,2,%0\n"
+"1: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%0\n"
+" ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%%r1),%1\n"
+" addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%0\n"
+" ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%%r1),%0\n"
: "=r" (dynamic_linkaddress), "=r" (dynamic) : : "r1");
return dynamic - dynamic_linkaddress;
#define RTLD_START \
/* Set up dp for any non-PIC lib constructors that may be called. */ \
-static struct link_map * set_dp (struct link_map *map) \
-{ \
- register Elf32_Addr dp asm ("%r27"); \
- dp = D_PTR (map, l_info[DT_PLTGOT]); \
- asm volatile ("" : : "r" (dp)); \
- return map; \
-} \
- \
-asm ("\
- .text
- .globl _start
- .type _start,@function
-_start:
- /* The kernel does not give us an initial stack frame. */
- ldo 64(%sp),%sp
- /* Save the relevant arguments (yes, those are the correct
- registers, the kernel is weird) in their stack slots. */
- stw %r25,-40(%sp) /* argc */
- stw %r24,-44(%sp) /* argv */
-
- /* We need the LTP, and we need it now. */
- /* $PIC_pcrel$0 points 8 bytes past the current instruction,
- just like a branch reloc. This sequence gets us the runtime
- address of _DYNAMIC. */
- bl 0f,%r19
- depi 0,31,2,%r19 /* clear priviledge bits */
-0: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%r19
- ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%r1),%r26
-
- /* Also get the link time address from the first entry of the GOT. */
- addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%r19
- ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%r1),%r20
-
- sub %r26,%r20,%r20 /* Calculate load offset */
-
- /* Rummage through the dynamic entries, looking for DT_PLTGOT. */
- ldw,ma 8(%r26),%r19
-1: cmpib,=,n 3,%r19,2f /* tag == DT_PLTGOT? */
- cmpib,<>,n 0,%r19,1b
- ldw,ma 8(%r26),%r19
-
- /* Uh oh! We didn't find one. Abort. */
- iitlbp %r0,(%r0)
-
-2: ldw -4(%r26),%r19 /* Found it, load value. */
- add %r19,%r20,%r19 /* And add the load offset. */
-
- /* Our initial stack layout is rather different from everyone
- else's due to the unique PA-RISC ABI. As far as I know it
- looks like this:
-
- ----------------------------------- (this frame created above)
- | 32 bytes of magic |
- |---------------------------------|
- | 32 bytes argument/sp save area |
- |---------------------------------| ((current->mm->env_end) + 63 & ~63)
- | N bytes of slack |
- |---------------------------------|
- | envvar and arg strings |
- |---------------------------------|
- | ELF auxiliary info |
- | (up to 28 words) |
- |---------------------------------|
- | Environment variable pointers |
- | upwards to NULL |
- |---------------------------------|
- | Argument pointers |
- | upwards to NULL |
- |---------------------------------|
- | argc (1 word) |
- -----------------------------------
-
- So, obviously, we can't just pass %sp to _dl_start. That's
- okay, argv-4 will do just fine.
-
- The pleasant part of this is that if we need to skip
- arguments we can just decrement argc and move argv, because
- the stack pointer is utterly unrelated to the location of
- the environment and argument vectors. */
-
- /* This is always within range so we'll be okay. */
- bl _dl_start,%rp
- ldo -4(%r24),%r26
-
- .globl _dl_start_user
- .type _dl_start_user,@function
-_dl_start_user:
- /* Save the entry point in %r3. */
- copy %ret0,%r3
-
- /* Remember the lowest stack address. */
- addil LT'__libc_stack_end,%r19
- ldw RT'__libc_stack_end(%r1),%r20
- stw %sp,0(%r20)
-
- /* See if we were called as a command with the executable file
- name as an extra leading argument. */
- addil LT'_dl_skip_args,%r19
- ldw RT'_dl_skip_args(%r1),%r20
- ldw 0(%r20),%r20
-
- ldw -40(%sp),%r25 /* argc */
- comib,= 0,%r20,.Lnofix /* FIXME: will be mispredicted */
- ldw -44(%sp),%r24 /* argv (delay slot) */
-
- sub %r25,%r20,%r25
- stw %r25,-40(%sp)
- sh2add %r20,%r24,%r24
- stw %r24,-44(%sp)
-
-.Lnofix:
- addil LT'_dl_loaded,%r19
- ldw RT'_dl_loaded(%r1),%r26
- bl set_dp, %r2
- ldw 0(%r26),%r26
-
- /* Call _dl_init(_dl_loaded, argc, argv, envp). */
- copy %r28,%r26
-
- /* envp = argv + argc + 1 */
- sh2add %r25,%r24,%r23
- bl _dl_init,%r2
- ldo 4(%r23),%r23 /* delay slot */
-
- /* Reload argc, argv to the registers start.S expects them in (feh) */
- ldw -40(%sp),%r25
- ldw -44(%sp),%r24
-
- /* _dl_fini does have a PLT slot now. I don't know how to get
- to it though, so this hack will remain. */
- .section .data
-__dl_fini_plabel:
- .word _dl_fini
- .word 0xdeadbeef
- .previous
-
- /* %r3 contains a function pointer, we need to mask out the lower
- * bits and load the gp and jump address. */
- depi 0,31,2,%r3
- ldw 0(%r3),%r2
- addil LT'__dl_fini_plabel,%r19
- ldw RT'__dl_fini_plabel(%r1),%r23
- stw %r19,4(%r23)
- ldw 4(%r3),%r19 /* load the object's gp */
- bv %r0(%r2)
- depi 2,31,2,%r23 /* delay slot */
-");
+static struct link_map * \
+set_dp (struct link_map *map) \
+{ \
+ register Elf32_Addr dp asm ("%r27"); \
+ dp = D_PTR (map, l_info[DT_PLTGOT]); \
+ asm volatile ("" : : "r" (dp)); \
+ return map; \
+} \
+ \
+asm ( \
+" .text\n" \
+" .globl _start\n" \
+" .type _start,@function\n" \
+"_start:\n" \
+ /* The kernel does not give us an initial stack frame. */ \
+" ldo 64(%sp),%sp\n" \
+ /* Save the relevant arguments (yes, those are the correct \
+ registers, the kernel is weird) in their stack slots. */ \
+" stw %r25,-40(%sp)\n" /* argc */ \
+" stw %r24,-44(%sp)\n" /* argv */ \
+ \
+ /* We need the LTP, and we need it now. */ \
+ /* $PIC_pcrel$0 points 8 bytes past the current instruction, \
+ just like a branch reloc. This sequence gets us the runtime \
+ address of _DYNAMIC. */ \
+" bl 0f,%r19\n" \
+" depi 0,31,2,%r19\n" /* clear priviledge bits */ \
+"0: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%r19\n" \
+" ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%r1),%r26\n" \
+ \
+ /* Also get the link time address from the first entry of the GOT. */ \
+" addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%r19\n" \
+" ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%r1),%r20\n" \
+ \
+" sub %r26,%r20,%r20\n" /* Calculate load offset */ \
+ \
+ /* Rummage through the dynamic entries, looking for DT_PLTGOT. */ \
+" ldw,ma 8(%r26),%r19\n" \
+"1: cmpib,=,n 3,%r19,2f\n" /* tag == DT_PLTGOT? */ \
+" cmpib,<>,n 0,%r19,1b\n" \
+" ldw,ma 8(%r26),%r19\n" \
+ \
+ /* Uh oh! We didn't find one. Abort. */ \
+" iitlbp %r0,(%r0)\n" \
+ \
+"2: ldw -4(%r26),%r19\n" /* Found it, load value. */ \
+" add %r19,%r20,%r19\n" /* And add the load offset. */ \
+ \
+ /* Our initial stack layout is rather different from everyone \
+ else's due to the unique PA-RISC ABI. As far as I know it \
+ looks like this: \
+ \
+ ----------------------------------- (this frame created above) \
+ | 32 bytes of magic | \
+ |---------------------------------| \
+ | 32 bytes argument/sp save area | \
+ |---------------------------------| ((current->mm->env_end) + 63 & ~63) \
+ | N bytes of slack | \
+ |---------------------------------| \
+ | envvar and arg strings | \
+ |---------------------------------| \
+ | ELF auxiliary info | \
+ | (up to 28 words) | \
+ |---------------------------------| \
+ | Environment variable pointers | \
+ | upwards to NULL | \
+ |---------------------------------| \
+ | Argument pointers | \
+ | upwards to NULL | \
+ |---------------------------------| \
+ | argc (1 word) | \
+ ----------------------------------- \
+ \
+ So, obviously, we can't just pass %sp to _dl_start. That's \
+ okay, argv-4 will do just fine. \
+ \
+ The pleasant part of this is that if we need to skip \
+ arguments we can just decrement argc and move argv, because \
+ the stack pointer is utterly unrelated to the location of \
+ the environment and argument vectors. */ \
+ \
+ /* This is always within range so we'll be okay. */ \
+" bl _dl_start,%rp\n" \
+" ldo -4(%r24),%r26\n" \
+ \
+" .globl _dl_start_user\n" \
+" .type _dl_start_user,@function\n" \
+"_dl_start_user:\n" \
+ /* Save the entry point in %r3. */ \
+" copy %ret0,%r3\n" \
+ \
+ /* Remember the lowest stack address. */ \
+" addil LT'__libc_stack_end,%r19\n" \
+" ldw RT'__libc_stack_end(%r1),%r20\n" \
+" stw %sp,0(%r20)\n" \
+ \
+ /* See if we were called as a command with the executable file \
+ name as an extra leading argument. */ \
+" addil LT'_dl_skip_args,%r19\n" \
+" ldw RT'_dl_skip_args(%r1),%r20\n" \
+" ldw 0(%r20),%r20\n" \
+ \
+" ldw -40(%sp),%r25\n" /* argc */ \
+" comib,= 0,%r20,.Lnofix\n" /* FIXME: will be mispredicted */ \
+" ldw -44(%sp),%r24\n" /* argv (delay slot) */ \
+ \
+" sub %r25,%r20,%r25\n" \
+" stw %r25,-40(%sp)\n" \
+" sh2add %r20,%r24,%r24\n" \
+" stw %r24,-44(%sp)\n" \
+ \
+".Lnofix:\n" \
+" addil LT'_dl_loaded,%r19\n" \
+" ldw RT'_dl_loaded(%r1),%r26\n" \
+" bl set_dp, %r2\n" \
+" ldw 0(%r26),%r26\n" \
+ \
+ /* Call _dl_init(_dl_loaded, argc, argv, envp). */ \
+" copy %r28,%r26\n" \
+ \
+ /* envp = argv + argc + 1 */ \
+" sh2add %r25,%r24,%r23\n" \
+" bl _dl_init,%r2\n" \
+" ldo 4(%r23),%r23\n" /* delay slot */ \
+ \
+ /* Reload argc, argv to the registers start.S expects them in (feh) */ \
+" ldw -40(%sp),%r25\n" \
+" ldw -44(%sp),%r24\n" \
+ \
+ /* _dl_fini does have a PLT slot now. I don't know how to get \
+ to it though, so this hack will remain. */ \
+" .section .data\n" \
+"__dl_fini_plabel:\n" \
+" .word _dl_fini\n" \
+" .word 0xdeadbeef\n" \
+" .previous\n" \
+ \
+ /* %r3 contains a function pointer, we need to mask out the lower \
+ * bits and load the gp and jump address. */ \
+" depi 0,31,2,%r3\n" \
+" ldw 0(%r3),%r2\n" \
+" addil LT'__dl_fini_plabel,%r19\n" \
+" ldw RT'__dl_fini_plabel(%r1),%r23\n" \
+" stw %r19,4(%r23)\n" \
+" ldw 4(%r3),%r19\n" /* load the object's gp */ \
+" bv %r0(%r2)\n" \
+" depi 2,31,2,%r23\n" /* delay slot */ \
+ );
/* This code gets called via the .plt stub, and is used in
projects / external / glibc.git / commitdiff