diff options
Diffstat (limited to 'libexec/rtld-elf/mips/rtld_start.S')
| -rw-r--r-- | libexec/rtld-elf/mips/rtld_start.S | 181 |
1 files changed, 107 insertions, 74 deletions
diff --git a/libexec/rtld-elf/mips/rtld_start.S b/libexec/rtld-elf/mips/rtld_start.S index 138729d..b4b7079 100644 --- a/libexec/rtld-elf/mips/rtld_start.S +++ b/libexec/rtld-elf/mips/rtld_start.S @@ -1,5 +1,4 @@ -/* $NetBSD: rtld_start.S,v 1.9 2002/10/05 11:59:05 mycroft Exp $ */ -/* $FreeBSD$ */ +/* $NetBSD: rtld_start.S,v 1.10 2009/12/14 00:41:19 matt Exp $ */ /* * Copyright 1997 Michael L. Hitch <mhitch@montana.edu> @@ -27,6 +26,8 @@ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ */ #include <machine/asm.h> @@ -34,94 +35,126 @@ .globl _C_LABEL(_rtld_relocate_nonplt_self) .globl _C_LABEL(_rtld) +#define PTR_SIZE (1<<PTR_SCALESHIFT) + +/* + * a0 stack pointer + * a1 rtld cleanup (filled in by dynamic loader) + * a2 rtld object (filled in by dynamic loader) + * a3 ps_strings + */ LEAF(rtld_start) - .abicalls + .frame sp, 4*PTR_SIZE, ra + .mask 0x10090000,-PTR_SIZE .set noreorder + SETUP_GP + PTR_SUBU sp, 4*PTR_SIZE /* adjust stack pointer */ + SETUP_GP64(s4, rtld_start) + SAVE_GP(0) + /* -> 1*PTR_SIZE(sp) for atexit */ + /* -> 2*PTR_SIZE(sp) for obj_main */ + move s0, a0 /* save stack pointer from a0 */ + move s3, a3 /* save ps_strings pointer */ - .cpload t9 - addu sp, sp, -16 /* adjust stack pointer */ - /* keep it aligned */ - .cprestore 0 /* -> 0(sp) for gp */ - /* -> 4(sp) for atexit */ - /* -> 8(sp) for obj_main */ - move s0,a0 /* save stack pointer from a0 */ - move s1,a3 /* save ps_strings pointer */ - - la a1, 1f + PTR_LA a1, 1f bal 1f - nop -1: subu a1, ra, a1 /* relocbase */ - la t9,_C_LABEL(_rtld_relocate_nonplt_self) - move s2,a1 - la a0,_DYNAMIC - addu t9, a1, t9 - jalr t9 - addu a0, a1, a0 /* &_DYNAMIC */ - + PTR_LA t0, _C_LABEL(_rtld_relocate_nonplt_self) +1: PTR_SUBU a1, ra, a1 /* relocbase */ + PTR_LA a0, _DYNAMIC + PTR_ADDU t9, a1, t0 + jalr t9 /* _rtld_relocate_nonplt_self(dynp, relocabase) */ + PTR_ADDU a0, a1, a0 /* &_DYNAMIC */ - move a0, s0 /* stack pointer */ - addu a1, sp, 4 /* &exit_proc */ - addu a2, sp, 8 /* &objp */ - addu sp, sp, -16 /* arguments slot */ - jal _C_LABEL(_rtld) /* v0 = _rtld(sp, exit_proc, objp) */ - nop - addu sp, sp, 16 + move a0, s0 /* sp */ + PTR_ADDU a1, sp, 2*PTR_SIZE /* &our atexit function */ + PTR_ADDU a2, sp, 3*PTR_SIZE /* obj_main entry */ + jal _C_LABEL(_rtld) /* v0 = _rtld(sp, cleanup, objp) */ + nop - move a0, s0 /* arguments pointer */ - move a3, s1 /* arguments pointer */ - lw a1, 4(sp) /* our atexit function */ - lw a2, 8(sp) /* obj_main entry */ - addu sp, sp, 16 /* readjust stack */ - move t9,v0 - move a2,s1 /* restore ps_strings */ - jr t9 /* _start(ap, cleanup, obj, ps_strings); */ - nop + PTR_L a1, 2*PTR_SIZE(sp) /* our atexit function */ + PTR_L a2, 3*PTR_SIZE(sp) /* obj_main entry */ + PTR_ADDU sp, 4*PTR_SIZE /* readjust stack */ + move a0, s0 /* stack pointer */ + move t9, v0 + jr t9 /* _start(sp, cleanup, obj); */ + move a3, s3 /* restore ps_strings */ END(rtld_start) +#define XCALLFRAME_SIZ (12*SZREG) +#define XCALLFRAME_RA (10*SZREG) +#define XCALLFRAME_GP (9*SZREG) +#define XCALLFRAME_S0 (8*SZREG) +#define XCALLFRAME_A3 (7*SZREG) +#define XCALLFRAME_A2 (6*SZREG) +#define XCALLFRAME_A1 (5*SZREG) +#define XCALLFRAME_A0 (4*SZREG) +#if defined(__mips_n32) || defined(__mips_n64) +#define XCALLFRAME_A7 (3*SZREG) +#define XCALLFRAME_A6 (2*SZREG) +#define XCALLFRAME_A5 (1*SZREG) +#define XCALLFRAME_A4 (0*SZREG) +#endif + .globl _rtld_bind_start .ent _rtld_bind_start _rtld_bind_start: - /* ABI conventions for stubs: - * t8 contains symbol index - * t7 contains return address - */ - .frame sp, 0, ra /* satisfy compiler */ + .frame sp, XCALLFRAME_SIZ, $15 + move v1, gp /* save old GP */ +#if defined(__mips_o32) || defined(__mips_o64) + PTR_ADDU t9, 8 /* modify T9 to point at .cpload */ +#endif + SETUP_GP + PTR_SUBU sp, XCALLFRAME_SIZ /* save arguments and sp value in stack */ + SETUP_GP64(XCALLFRAME_GP, _rtld_bind_start) + SAVE_GP(XCALLFRAME_GP) +#if defined(__mips_n32) || defined(__mips_n64) + REG_S a4, XCALLFRAME_A4(sp) + REG_S a5, XCALLFRAME_A5(sp) + REG_S a6, XCALLFRAME_A6(sp) + REG_S a7, XCALLFRAME_A7(sp) +#endif + REG_S a0, XCALLFRAME_A0(sp) + REG_S a1, XCALLFRAME_A1(sp) + REG_S a2, XCALLFRAME_A2(sp) + REG_S a3, XCALLFRAME_A3(sp) + REG_S $15, XCALLFRAME_RA(sp) /* ra is in t7/t3 */ + REG_S s0, XCALLFRAME_S0(sp) + move s0, sp - move v1,gp /* save old GP */ - add t9,8 /* modify T9 to point at .cpload */ - .cpload t9 - subu sp,48 /* save arguments and sp value */ - .cprestore 36 - sw a0,16(sp) - sw a1,20(sp) - sw a2,24(sp) - sw a3,28(sp) - sw s0,32(sp) - sw t7,40(sp) - move s0,sp - move a0,v1 /* old GP */ - subu a0,a0,0x7ff0 /* The offset of $gp from the */ - /* beginning of the .got section: */ + move a0, v1 /* old GP */ + subu a0, a0, 0x7ff0 /* The offset of $gp from the */ + /* beginning of the .got section: */ /* $gp = .got + 0x7ff0, so */ /* .got = $gp - 0x7ff0 */ /* Simple math as you can see. */ +#if defined(__mips_n64) + ld a0, 8(a0) /* object = pltgot[1] & 0x7fffffff */ +#else + lw a0, 4(a0) /* object = pltgot[1] & 0x7fffffff */ +#endif + and a0, a0, 0x7fffffff + move a1, t8 /* symbol index */ - lw a0,4(a0) /* object = pltgot[1] & 0x7fffffff */ - and a0,a0,0x7fffffff - move a1,t8 /* symbol index */ - jal _C_LABEL(_mips_rtld_bind) - nop - move sp,s0 - lw ra,40(sp) - lw a0,16(sp) - lw a1,20(sp) - lw a2,24(sp) - lw a3,28(sp) - lw s0,32(sp) - addu sp,48 - move t9,v0 + nop + + move sp, s0 + REG_L ra, XCALLFRAME_RA(sp) + REG_L s0, XCALLFRAME_S0(sp) + REG_L a0, XCALLFRAME_A0(sp) + REG_L a1, XCALLFRAME_A1(sp) + REG_L a2, XCALLFRAME_A2(sp) + REG_L a3, XCALLFRAME_A3(sp) +#if defined(__mips_n32) || defined(__mips_n64) + REG_L a4, XCALLFRAME_A4(sp) + REG_L a5, XCALLFRAME_A5(sp) + REG_L a6, XCALLFRAME_A6(sp) + REG_L a7, XCALLFRAME_A7(sp) +#endif + RESTORE_GP64 + PTR_ADDU sp, XCALLFRAME_SIZ + move t9, v0 jr t9 - nop - .end _rtld_bind_start + nop +END(_rtld_bind_start) |
