diff options
Diffstat (limited to 'libexec/rtld-elf/alpha/rtld_start.S')
| -rw-r--r-- | libexec/rtld-elf/alpha/rtld_start.S | 178 |
1 files changed, 110 insertions, 68 deletions
diff --git a/libexec/rtld-elf/alpha/rtld_start.S b/libexec/rtld-elf/alpha/rtld_start.S index 29d6178..d21c088 100644 --- a/libexec/rtld-elf/alpha/rtld_start.S +++ b/libexec/rtld-elf/alpha/rtld_start.S @@ -33,6 +33,7 @@ #include <machine/pal.h> .extern _GLOBAL_OFFSET_TABLE_ +.extern _GOT_END_ LEAF(_rtld_start, 0) /* XXX */ .set noreorder @@ -58,7 +59,7 @@ $34: ldiq t3, $34 /* get where the linker thought we were */ lda t5, _GLOBAL_OFFSET_TABLE_ addq t8, t5, t9 /* add the displacement */ - lda t4, _DYNAMIC + lda t4, _GOT_END_ addq t8, t4, t10 /* add the displacement */ /* @@ -87,7 +88,7 @@ $35: ldq t1, 0(t9) /* load the value */ lda sp, 16(sp) /* readjust our stack */ mov s0, a0 /* stack pointer */ mov s1, a3 /* ps_strings pointer */ - mov v0, t12 + mov v0, pv jsr ra, (v0), 0 /* (*_start)(sp, cleanup, obj); */ ldgp gp, 0(ra) @@ -95,77 +96,118 @@ $35: ldq t1, 0(t9) /* load the value */ halt END(_rtld_start) - .set noat - .globl _rtld_bind_start - .ent _rtld_bind_start -_rtld_bind_start: - - lda sp, -168(sp) - .frame sp, 168, $26 - /* Preserve all registers that C normally doesn't. */ - stq $26, 0(sp) - stq $0, 8(sp) - stq $1, 16(sp) - stq $2, 24(sp) - stq $3, 32(sp) - stq $4, 40(sp) - stq $5, 48(sp) - stq $6, 56(sp) - stq $7, 64(sp) - stq $8, 72(sp) - stq $16, 80(sp) - stq $17, 88(sp) - stq $18, 96(sp) - stq $19, 104(sp) - stq $20, 112(sp) - stq $21, 120(sp) - stq $22, 128(sp) - stq $23, 136(sp) - stq $24, 144(sp) - stq $25, 152(sp) - stq $29, 160(sp) - .mask 0x27ff01ff, -168 - /* Set up our $gp */ - br gp, $100 -$100: ldgp gp, 0(gp) - .prologue 1 +#define RTLD_BIND_START_PROLOGUE \ + /* at_reg already used by PLT code. */ \ + .set noat ; \ + \ + /* \ + * Allocate stack frame and preserve all registers that the \ + * caller would have normally saved themselves. \ + */ \ + lda sp, -168(sp) ; \ + stq ra, 0(sp) ; \ + stq v0, 8(sp) ; \ + stq t0, 16(sp) ; \ + stq t1, 24(sp) ; \ + stq t2, 32(sp) ; \ + stq t3, 40(sp) ; \ + stq t4, 48(sp) ; \ + stq t5, 56(sp) ; \ + stq t6, 64(sp) ; \ + stq t7, 72(sp) ; \ + stq a0, 80(sp) ; \ + stq a1, 88(sp) ; \ + stq a2, 96(sp) ; \ + stq a3, 104(sp) ; \ + stq a4, 112(sp) ; \ + stq a5, 120(sp) ; \ + stq t8, 128(sp) ; \ + stq t9, 136(sp) ; \ + stq t10, 144(sp) ; \ + stq t11, 152(sp) ; \ + stq gp, 160(sp) ; \ + \ + /* \ + * Load our global pointer. Note, can't use pv, since it is \ + * already used by the PLT code. \ + */ \ + br t0, 1f ; \ +1: LDGP(t0) + +#define RTLD_BIND_START_EPILOGUE \ + /* Move the destination address into position. */ \ + mov v0, pv ; \ + \ + /* Restore program registers. */ \ + ldq ra, 0(sp) ; \ + ldq v0, 8(sp) ; \ + ldq t0, 16(sp) ; \ + ldq t1, 24(sp) ; \ + ldq t2, 32(sp) ; \ + ldq t3, 40(sp) ; \ + ldq t4, 48(sp) ; \ + ldq t5, 56(sp) ; \ + ldq t6, 64(sp) ; \ + ldq t7, 72(sp) ; \ + ldq a0, 80(sp) ; \ + ldq a1, 88(sp) ; \ + ldq a2, 96(sp) ; \ + ldq a3, 104(sp) ; \ + ldq a4, 112(sp) ; \ + ldq a5, 120(sp) ; \ + ldq t8, 128(sp) ; \ + ldq t9, 136(sp) ; \ + ldq t10, 144(sp) ; \ + ldq t11, 152(sp) ; \ + ldq gp, 160(sp) ; \ + /* XXX LDGP? */ \ + \ + /* \ + * We've patched the PLT; sync the I-stream. \ + */ \ + imb ; \ + \ + /* Pop the stack frame and turn control to the destination. */ \ + lda sp, 168(sp) ; \ + jmp zero, (pv) + + +/* + * Lazy binding entry point, called via PLT. + */ +NESTED_NOPROFILE(_rtld_bind_start, 0, 168, ra, 0, 0) + + RTLD_BIND_START_PROLOGUE + /* Set up the arguments for _rtld_bind. */ - subq at_reg, t12, a1 /* calculate reloc offset */ - ldq a0, 8(t12) /* object structure */ + subq at_reg, pv, a1 /* calculate reloc offset */ + ldq a0, 8(pv) /* object structure */ subq a1, 20, a1 /* = (at - t11 - 20) / 12 * 24 */ addq a1, a1, a1 + CALL(_rtld_bind) - /* Move the destination address into position. */ - mov $0, $27 - /* Restore program registers. */ - ldq $26, 0(sp) - ldq $0, 8(sp) - ldq $1, 16(sp) - ldq $2, 24(sp) - ldq $3, 32(sp) - ldq $4, 40(sp) - ldq $5, 48(sp) - ldq $6, 56(sp) - ldq $7, 64(sp) - ldq $8, 72(sp) - ldq $16, 80(sp) - ldq $17, 88(sp) - ldq $18, 96(sp) - ldq $19, 104(sp) - ldq $20, 112(sp) - ldq $21, 120(sp) - ldq $22, 128(sp) - ldq $23, 136(sp) - ldq $24, 144(sp) - ldq $25, 152(sp) - ldq $29, 160(sp) - /* Flush the Icache after having modified the .plt code. */ - imb - /* Clean up and turn control to the destination */ - lda sp, 168(sp) - jmp $31, ($27) - .end _rtld_bind_start + RTLD_BIND_START_EPILOGUE + +END(_rtld_bind_start) + +/* + * Lazy binding entry point, called via PLT. This version is for the + * old PLT entry format. + */ +NESTED_NOPROFILE(_rtld_bind_start_old, 0, 168, ra, 0, 0) + + RTLD_BIND_START_PROLOGUE + + /* Set up the arguments for _rtld_bind. */ + ldq a0, 8(pv) /* object structure */ + mov at_reg, a1 /* offset of reloc entry */ + + CALL(_rtld_bind) + + RTLD_BIND_START_EPILOGUE + +END(_rtld_bind_start_old) /* * int cmp0_and_store_int(volatile int *p, int newval); |
