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- Although we pass first 4 arguments in registers, function callinf ABI requires

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space to be reserved for them in stack. _rtld() prologue saves a1 and a2 in
   this space.

- Whitespace cleanup while I'm at it
This commit is contained in:
Oleksandr Tymoshenko 2012-03-12 20:24:59 +00:00
parent 6ac6f295b0
commit 33ddd0f61a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=232884
1 changed files with 9 additions and 7 deletions
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16
libexec/rtld-elf/mips/rtld_start.S
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@ -58,28 +58,30 @@ LEAF(rtld_start)
PTR_LA a1, 1f
bal 1f
PTR_LA t0, _C_LABEL(_rtld_relocate_nonplt_self)
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 */
PTR_ADDU a0, a1, a0 /* &_DYNAMIC */
move a0, s0 /* sp */
PTR_ADDU a1, sp, 2*PTR_SIZE /* &our atexit function */
PTR_ADDU a2, sp, 3*PTR_SIZE /* obj_main entry */
subu sp, 4*SZREG /* ABI requires to reserve memory for 4 regs */
PTR_LA t9, _C_LABEL(_rtld)
jalr t9 /* v0 = _rtld(sp, cleanup, objp) */
nop
nop
addu sp, 4*SZREG
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
subu sp, 4*SZREG /* ABI requires to reserve memory for 4 regs */
jr t9 /* _start(sp, cleanup, obj); */
move a3, s3 /* restore ps_strings */
move a3, s3 /* restore ps_strings */
END(rtld_start)
#define XCALLFRAME_SIZ (12*SZREG)
@ -140,7 +142,7 @@ _rtld_bind_start:
PTR_LA t9, _C_LABEL(_mips_rtld_bind)
jalr t9
nop
nop
move sp, s0
REG_L ra, XCALLFRAME_RA(sp)
@ -159,5 +161,5 @@ _rtld_bind_start:
PTR_ADDU sp, XCALLFRAME_SIZ
move t9, v0
jr t9
nop
nop
END(_rtld_bind_start)