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make sh clone asm fdpic-compatible 

clone calls back to a function pointer provided by the caller, which
will actually be a pointer to a function descriptor on fdpic. the
obvious solution is to have a separate version of clone for fdpic, but
I have taken a simpler approach to go around the problem. instead of
calling the pointed-to function from asm, a direct call is made to an
internal C function which then calls the pointed-to function. this
lets the C compiler generate the appropriate calling convention for an
indirect call with no need for ABI-specific assembly.
This commit is contained in:
Rich Felker 2015-09-12 02:55:28 +00:00
parent ad5d8a2bf3
commit 234c58467c
2 changed files with 14 additions and 3 deletions
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5
arch/sh/src/__shcall.c Normal file
View File

@ -0,0 +1,5 @@
__attribute__((__visibility__("hidden")))
int __shcall(void *arg, int (*func)(void *))
{
return func(arg);
}

12
src/thread/sh/clone.s
View File

@ -33,10 +33,12 @@ __clone:
nop
1: ! we are the child, call fn(arg)
jsr @r1
mov r2, r4
mov.l 1f, r0
mov r1, r5
bsrf r0
mov r2, r4
mov #1, r3 ! __NR_exit
2: mov #1, r3 ! __NR_exit
mov r0, r4
trapa #31
@ -45,3 +47,7 @@ __clone:
or r0, r0
or r0, r0
or r0, r0
.align 2
.hidden __shcall
1: .long __shcall@PCREL+(.-2b)