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Diffstat (limited to 'rts/AdjustorAsm.S')
| -rw-r--r-- | rts/AdjustorAsm.S | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/rts/AdjustorAsm.S b/rts/AdjustorAsm.S new file mode 100644 index 0000000000..cfdef68349 --- /dev/null +++ b/rts/AdjustorAsm.S @@ -0,0 +1,189 @@ +#include "../includes/ghcconfig.h" + +/* ******************************** PowerPC ******************************** */ + +#if defined(powerpc_HOST_ARCH) || defined(powerpc64_HOST_ARCH) +#if !(defined(powerpc_HOST_ARCH) && defined(linux_HOST_OS)) + /* The following code applies, with some differences, + to all powerpc platforms except for powerpc32-linux, + whose calling convention is annoyingly complex. + */ + + + /* The code is "almost" the same for + 32-bit and for 64-bit + */ +#if defined(powerpc64_HOST_ARCH) +#define WS 8 +#define LOAD ld +#define STORE std +#else +#define WS 4 +#define LOAD lwz +#define STORE stw +#endif + + /* Some info about stack frame layout */ +#define LINK_SLOT (2*WS) +#define LINKAGE_AREA_SIZE (6*WS) + + /* The following defines mirror struct AdjustorStub + from Adjustor.c. Make sure to keep these in sync. + */ +#if defined(powerpc_HOST_ARCH) && defined(darwin_HOST_OS) +#define HEADER_WORDS 6 +#elif defined(powerpc64_HOST_ARCH) && defined(darwin_HOST_OS) +#else +#define HEADER_WORDS 3 +#endif + +#define HPTR_OFF ((HEADER_WORDS )*WS) +#define WPTR_OFF ((HEADER_WORDS + 1)*WS) +#define FRAMESIZE_OFF ((HEADER_WORDS + 2)*WS) +#define EXTRA_WORDS_OFF ((HEADER_WORDS + 3)*WS) + + /* Darwin insists on register names, everyone else prefers + to use numbers. */ +#if !defined(darwin_HOST_OS) +#define r0 0 +#define r1 1 +#define r2 2 +#define r3 3 +#define r4 4 +#define r5 5 +#define r6 6 +#define r7 7 +#define r8 8 +#define r9 9 +#define r10 10 +#define r11 11 +#define r12 12 + +#define r30 30 +#define r31 31 +#endif + + +.text +#if LEADING_UNDERSCORE + .globl _adjustorCode +_adjustorCode: +#else + .globl adjustorCode + /* Note that we don't build a function descriptor + for AIX-derived ABIs here. This will happen at runtime + in createAdjustor(). + */ +adjustorCode: +#endif + /* On entry, r2 will point to the AdjustorStub data structure. */ + + /* save the link */ + mflr r0 + STORE r0, LINK_SLOT(r1) + + /* set up stack frame */ + LOAD r12, FRAMESIZE_OFF(r2) +#ifdef powerpc64_HOST_ARCH + stdux r1, r1, r12 +#else + stwux r1, r1, r12 +#endif + + /* Save some regs so that we can use them. + Note that we use the "Red Zone" below the stack pointer. + */ + STORE r31, -WS(r1) + STORE r30, -2*WS(r1) + + mr r31, r1 + subf r30, r12, r31 + + LOAD r12, EXTRA_WORDS_OFF(r2) + mtctr r12 + b 2f +1: + LOAD r0, LINKAGE_AREA_SIZE + 8*WS(r30) + STORE r0, LINKAGE_AREA_SIZE + 10*WS(r31) + addi r30, r30, WS + addi r31, r31, WS +2: + bdnz 1b + + /* Restore r30 and r31 now. + */ + LOAD r31, -WS(r1) + LOAD r30, -2*WS(r1) + + STORE r10, LINKAGE_AREA_SIZE + 9*WS(r1) + STORE r9, LINKAGE_AREA_SIZE + 8*WS(r1) + mr r10, r8 + mr r9, r7 + mr r8, r6 + mr r7, r5 + mr r6, r4 + mr r5, r3 + + LOAD r3, HPTR_OFF(r2) + + LOAD r12, WPTR_OFF(r2) +#if defined(darwin_HOST_OS) + mtctr r12 +#else + LOAD r0, 0(r12) + /* The function we're calling will never be a nested function, + so we don't load r11. + */ + mtctr r0 + LOAD r2, WS(r12) +#endif + bctrl + + LOAD r1, 0(r1) + LOAD r0, LINK_SLOT(r1) + mtlr r0 + blr +#endif + +/* ********************************* i386 ********************************** */ + +#elif defined(i386_HOST_ARCH) && defined(darwin_HOST_OS) + +#define WS 4 +#define RETVAL_OFF 5 +#define HEADER_BYTES 8 + +#define HPTR_OFF HEADER_BYTES +#define WPTR_OFF (HEADER_BYTES + 1*WS) +#define FRAMESIZE_OFF (HEADER_BYTES + 2*WS) +#define ARGWORDS_OFF (HEADER_BYTES + 3*WS) + + .globl _adjustorCode +_adjustorCode: + popl %eax + subl $RETVAL_OFF, %eax + + pushl %ebp + movl %esp, %ebp + + subl FRAMESIZE_OFF(%eax), %esp + + pushl %esi + pushl %edi + + leal 8(%ebp), %esi + leal 12(%esp), %edi + movl ARGWORDS_OFF(%eax), %ecx + rep + movsl + + popl %edi + popl %esi + + pushl HPTR_OFF(%eax) + call *WPTR_OFF(%eax) + + leave + ret +#endif + |