diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/hppa/getcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/hppa/getcontext.S | 50 |
1 files changed, 27 insertions, 23 deletions
diff --git a/sysdeps/unix/sysv/linux/hppa/getcontext.S b/sysdeps/unix/sysv/linux/hppa/getcontext.S index 6470d73de5..dcdf986f2d 100644 --- a/sysdeps/unix/sysv/linux/hppa/getcontext.S +++ b/sysdeps/unix/sysv/linux/hppa/getcontext.S @@ -21,22 +21,28 @@ #include "ucontext_i.h" - /* Trampoline function. Non-standard calling ABI. */ + /* Trampoline function. Non-standard calling ABI. */ /* Can not use ENTRY(__getcontext_ret) here. */ .type __getcontext_ret, @function .hidden __getcontext_ret __getcontext_ret: .proc .callinfo FRAME=0,NO_CALLS - /* r26-r23 contain original r3-r6, but because setcontext - does not reload r3-r6 (it's using them as temporaries) - we must save them elsewhere and swap them back in. */ - copy %r23, %r3 - copy %r24, %r4 - copy %r25, %r5 - copy %r26, %r6 - /* r20 contains original return pointer. */ - bv 0(%r20) + /* Because setcontext does not reload r3-r6 (it's using them + as temporaries), we must load them ourself. */ + ldw oR3(%r26), %r3 + ldw oR4(%r26), %r4 + ldw oR5(%r26), %r5 + ldw oR6(%r26), %r6 + + /* Also reload registers clobbered by $$dyncall. */ + ldw oR21(%r26), %r21 + ldw oR22(%r26), %r22 + ldw oR31(%r26), %r31 + + /* oR0 contains original return pointer. */ + ldw oR0(%r26), %rp + bv 0(%rp) copy %r0, %ret0 .procend .size __getcontext_ret, .-__getcontext_ret @@ -64,13 +70,13 @@ ENTRY(__getcontext) stw %r17, oR17(%r26) stw %r18, oR18(%r26) stw %r19, oR19(%r26) - /* stw %r20, oR20(%r26) - used for trampoline. */ + stw %r20, oR20(%r26) stw %r21, oR21(%r26) stw %r22, oR22(%r26) - /* stw %r23, oR23(%r26) - used for trampoline. */ - /* stw %r24, oR24(%r26) - used for trampoline. */ - /* stw %r25, oR25(%r26) - used for trampoline. */ - /* stw %r26, oR26(%r26) - used for trampoline. */ + stw %r23, oR23(%r26) + stw %r24, oR24(%r26) + stw %r25, oR25(%r26) + stw %r26, oR26(%r26) stw %r27, oR27(%r26) stw %r28, oR28(%r26) stw %r29, oR29(%r26) @@ -89,7 +95,10 @@ ENTRY(__getcontext) stw %r0, oIASQ1(%r26) stw %r0, oIAOQ0(%r26) stw %r0, oIAOQ1(%r26) - stw %r0, oSAR(%r26) /* used as flag in swapcontext(). */ + + /* Save SAR register. */ + mfctl %sar, %r1 + stw %r1, oSAR(%r26) /* MSB used as flag in swapcontext(). */ /* Store floating-point regs. */ @@ -141,13 +150,8 @@ ENTRY(__getcontext) .cfi_offset 29, 4 /* Set up the trampoline registers. - r20, r23, r24, r25, r26 and r2 are clobbered - by call to getcontext() anyway. Reuse them. */ - stw %r2, oR20(%r26) - stw %r3, oR23(%r26) - stw %r4, oR24(%r26) - stw %r5, oR25(%r26) - stw %r6, oR26(%r26) + Use oR0 context slot to save return value. */ + stw %r2, oR0(%r26) #ifdef PIC addil LT%__getcontext_ret, %r19 ldw RT%__getcontext_ret(%r1), %r1 |