mirror of git://sourceware.org/git/glibc.git
144 lines
3.4 KiB
ArmAsm
144 lines
3.4 KiB
ArmAsm
/* Userland trampoline code for sigaction on Linux/SPARC */
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/* (C) 1996, 1997 Free Software Foundation, Inc. */
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/* This file is part of the GNU C Library. */
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/* Contributed by Miguel de Icaza (miguel@gnu.ai.mit.edu) */
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/* Many thanks go to David Miller for explaining all this to me */
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/* miguel@nuclecu.unam.mx */
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/* Sources: David Miller, 4.4BSD/SPARC code */
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#include <sysdep.h>
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#define __ASSEMBLY__
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/* For REGWIN_SZ */
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#include <asm/ptrace.h>
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#include <asm/psr.h>
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/* The C compiler frame size */
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#define CCFSZ 96
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.text
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ENTRY(____sparc_signal_trampoline)
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.global C_SYMBOL_NAME(____sig_table)
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/* Make room for 32 %f registers + %fsr
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* this is 132 bytes + alignement = 136
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* 96 is the C frame size
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*/
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save %sp,-136-CCFSZ,%sp
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/* save regular registers */
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mov %g2,%l2
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mov %g3,%l3
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mov %g4,%l4
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mov %g5,%l5
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mov %g6,%l6
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mov %g7,%l7
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/* save fpu registers */
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ld [%fp+64+16+20],%l0 /* load the psr from sigcontext */
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sethi %hi(PSR_EF),%l1
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andcc %l0,%l1,%l0 /* is floating point enabled? */
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be 1f
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rd %y,%l1 /* save y anyways */
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/* save fpu registers */
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st %fsr, [%sp + CCFSZ + 0]
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std %f0, [%sp + CCFSZ + 8]
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std %f2, [%sp + CCFSZ + 16]
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std %f4, [%sp + CCFSZ + 24]
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std %f6, [%sp + CCFSZ + 32]
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std %f8, [%sp + CCFSZ + 40]
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std %f10, [%sp + CCFSZ + 48]
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std %f12, [%sp + CCFSZ + 56]
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std %f14, [%sp + CCFSZ + 64]
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std %f16, [%sp + CCFSZ + 72]
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std %f18, [%sp + CCFSZ + 80]
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std %f20, [%sp + CCFSZ + 88]
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std %f22, [%sp + CCFSZ + 96]
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std %f24, [%sp + CCFSZ + 104]
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std %f26, [%sp + CCFSZ + 112]
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std %f28, [%sp + CCFSZ + 120]
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std %f30, [%sp + CCFSZ + 128]
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1:
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/* Load signal number */
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ld [%fp + REGWIN_SZ],%o0
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mov %fp,%o1
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mov 0xfea,%o2
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/* Sanity check */
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cmp %o0,33
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bl 1f
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or %g0,%g0,%g1 /*Call sys_setup */
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t 0x10
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1:
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#ifdef __PIC__
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/* Save return address */
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mov %o7,%o4
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___sxx:
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call ___syy
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nop
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___syy:
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sethi %hi(_GLOBAL_OFFSET_TABLE_-(___sxx-.)),%o5
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or %o5,%lo(_GLOBAL_OFFSET_TABLE_-(___sxx-.)),%o5
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add %o7,%o5,%o5
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/* restore return address */
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mov %o4,%o7
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mov %o5,%o4
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/* o4 has the GOT pointer */
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#endif
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sethi %hi(C_SYMBOL_NAME(____sig_table)),%o5
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or %o5,%lo(C_SYMBOL_NAME(____sig_table)),%o5
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#ifdef __PIC__
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add %o5,%o4,%o4
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ld [%o4],%o5
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#endif
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sll %o0,2,%o4
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add %o5,%o4,%o4
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ld [%o4],%o4
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ld [%fp + REGWIN_SZ + 4],%o1 /* Load subcode */
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ld [%fp + REGWIN_SZ + 8],%o2 /* pointer to sigcontext */
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call %o4
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ld [%fp + REGWIN_SZ + 12],%o3 /* Address where signal ocurre
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*/
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/* handler returned, restore state */
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tst %l0
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be 1f
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wr %l1,%g0,%y
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/* fpu restoration */
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ld [%sp + CCFSZ + 0], %fsr
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ldd [%sp + CCFSZ + 8], %f0
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ldd [%sp + CCFSZ + 16], %f2
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ldd [%sp + CCFSZ + 24], %f4
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ldd [%sp + CCFSZ + 32], %f6
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ldd [%sp + CCFSZ + 40], %f8
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ldd [%sp + CCFSZ + 48], %f10
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ldd [%sp + CCFSZ + 56], %f12
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ldd [%sp + CCFSZ + 64], %f14
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ldd [%sp + CCFSZ + 72], %f16
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ldd [%sp + CCFSZ + 80], %f18
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ldd [%sp + CCFSZ + 88], %f20
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ldd [%sp + CCFSZ + 96], %f22
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ldd [%sp + CCFSZ + 104], %f24
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ldd [%sp + CCFSZ + 112], %f26
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ldd [%sp + CCFSZ + 120], %f28
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ldd [%sp + CCFSZ + 128], %f30
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1:
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mov %l2,%g2
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mov %l3,%g3
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mov %l4,%g4
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mov %l5,%g5
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mov %l6,%g6
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mov %l7,%g7
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/* call sigreturn */
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restore %g0,SYS_ify(sigreturn),%g1 /* register back and set syscal */
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add %sp,64+16,%o0
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t 0x10
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/* if we return, sysreturn failed */
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mov SYS_ify(exit),%g1
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t 0x10
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