diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/hppa/getcontext.S | 50 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/hppa/setcontext.S | 6 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/hppa/swapcontext.c | 10 |
3 files changed, 35 insertions, 31 deletions
diff --git a/sysdeps/unix/sysv/linux/hppa/getcontext.S b/sysdeps/unix/sysv/linux/hppa/getcontext.S index 6470d73..dcdf986 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 diff --git a/sysdeps/unix/sysv/linux/hppa/setcontext.S b/sysdeps/unix/sysv/linux/hppa/setcontext.S index 5da01c2..dfa794a 100644 --- a/sysdeps/unix/sysv/linux/hppa/setcontext.S +++ b/sysdeps/unix/sysv/linux/hppa/setcontext.S @@ -75,7 +75,7 @@ ENTRY(__setcontext) ldw oR18(%r3), %r18 ldw oR19(%r3), %r19 ldw oR20(%r3), %r20 - ldw oR21(%r3), %r21 + ldw oR21(%r3), %r21 /* maybe clobbered by dyncall */ /* ldw oR22(%r3), %r22 - dyncall arg. */ ldw oR23(%r3), %r23 ldw oR24(%r3), %r24 @@ -87,6 +87,10 @@ ENTRY(__setcontext) ldw oR30(%r3), %sp /* ldw oR31(%r3), %r31 - dyncall scratch register */ + /* Restore SAR register. */ + ldw oSAR(%r3), %r22 + mtsar %r22 + /* Restore floating-point registers. */ ldo oFPREGS31(%r3), %r22 fldds 0(%r22), %fr31 diff --git a/sysdeps/unix/sysv/linux/hppa/swapcontext.c b/sysdeps/unix/sysv/linux/hppa/swapcontext.c index 64adb9e..e5bf6c9 100644 --- a/sysdeps/unix/sysv/linux/hppa/swapcontext.c +++ b/sysdeps/unix/sysv/linux/hppa/swapcontext.c @@ -25,10 +25,6 @@ extern int __setcontext (const ucontext_t *ucp); int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) { - /* Save ucp in stack argument slot. */ - asm ("stw %r25,-40(%sp)"); - asm (".cfi_offset 25, -40"); - /* Save rp for debugger. */ asm ("stw %rp,-20(%sp)"); asm (".cfi_offset 2, -20"); @@ -59,7 +55,7 @@ __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) asm ("bv,n %r0(%rp)"); /* Load sc_sar flag. */ - asm ("ldw %0(%%ret1),%%r20" : : "i" (oSAR)); + asm ("ldb %0(%%ret1),%%r20" : : "i" (oSAR)); /* Return if oucp context has been reactivated. */ asm ("or,= %r0,%r20,%r0"); @@ -67,11 +63,11 @@ __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) /* Mark sc_sar flag. */ asm ("1: ldi 1,%r20"); - asm ("stw %%r20,%0(%%ret1)" : : "i" (oSAR)); + asm ("stb %%r20,%0(%%ret1)" : : "i" (oSAR)); /* Activate the machine context in ucp. */ asm ("bl __setcontext,%rp"); - asm ("ldw -40(%sp),%r26"); + asm ("ldw %0(%%ret1),%%r26" : : "i" (oR25)); /* Load return pointer. */ asm ("ldw %0(%%ret1),%%rp" : : "i" (oR28)); |