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FFI: Add unwind definitions for lj_vm_ffi_call.

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Adds exception interoperability for C/C++ functions called via FFI
from the interpreter.
This commit is contained in:
Mike Pall
2011-11-11 22:10:31 +01:00
parent 0123e4fc89
commit 635371c212
12 changed files with 2522 additions and 1867 deletions
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34
src/buildvm_peobj.c
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@@ -191,15 +191,15 @@ void emit_peobj(BuildCtx *ctx)
#if LJ_TARGET_X64
memcpy(pesect[PEOBJ_SECT_PDATA].name, ".pdata", sizeof(".pdata")-1);
pesect[PEOBJ_SECT_PDATA].ofs = sofs;
sofs += (pesect[PEOBJ_SECT_PDATA].size = 3*4);
sofs += (pesect[PEOBJ_SECT_PDATA].size = 6*4);
pesect[PEOBJ_SECT_PDATA].relocofs = sofs;
sofs += (pesect[PEOBJ_SECT_PDATA].nreloc = 3) * PEOBJ_RELOC_SIZE;
sofs += (pesect[PEOBJ_SECT_PDATA].nreloc = 6) * PEOBJ_RELOC_SIZE;
/* Flags: 40 = read, 30 = align4, 40 = initialized data. */
pesect[PEOBJ_SECT_PDATA].flags = 0x40300040;
memcpy(pesect[PEOBJ_SECT_XDATA].name, ".xdata", sizeof(".xdata")-1);
pesect[PEOBJ_SECT_XDATA].ofs = sofs;
sofs += (pesect[PEOBJ_SECT_XDATA].size = 8*2+4); /* See below. */
sofs += (pesect[PEOBJ_SECT_XDATA].size = 8*2+4+6*2); /* See below. */
pesect[PEOBJ_SECT_XDATA].relocofs = sofs;
sofs += (pesect[PEOBJ_SECT_XDATA].nreloc = 1) * PEOBJ_RELOC_SIZE;
/* Flags: 40 = read, 30 = align4, 40 = initialized data. */
@@ -247,9 +247,12 @@ void emit_peobj(BuildCtx *ctx)
#if LJ_TARGET_X64
{ /* Write .pdata section. */
uint32_t fcofs = (uint32_t)ctx->sym[ctx->nsym-1].ofs;
uint32_t pdata[3]; /* Start of .text, end of .text and .xdata. */
PEreloc reloc;
pdata[0] = 0; pdata[1] = (uint32_t)ctx->codesz; pdata[2] = 0;
pdata[0] = 0; pdata[1] = fcofs; pdata[2] = 0;
owrite(ctx, &pdata, sizeof(pdata));
pdata[0] = fcofs; pdata[1] = (uint32_t)ctx->codesz; pdata[2] = 20;
owrite(ctx, &pdata, sizeof(pdata));
reloc.vaddr = 0; reloc.symidx = 1+2+nrsym+2+2+1;
reloc.type = PEOBJ_RELOC_ADDR32NB;
@@ -260,12 +263,21 @@ void emit_peobj(BuildCtx *ctx)
reloc.vaddr = 8; reloc.symidx = 1+2+nrsym+2;
reloc.type = PEOBJ_RELOC_ADDR32NB;
owrite(ctx, &reloc, PEOBJ_RELOC_SIZE);
reloc.vaddr = 12; reloc.symidx = 1+2+nrsym+2+2+1;
reloc.type = PEOBJ_RELOC_ADDR32NB;
owrite(ctx, &reloc, PEOBJ_RELOC_SIZE);
reloc.vaddr = 16; reloc.symidx = 1+2+nrsym+2+2+1;
reloc.type = PEOBJ_RELOC_ADDR32NB;
owrite(ctx, &reloc, PEOBJ_RELOC_SIZE);
reloc.vaddr = 20; reloc.symidx = 1+2+nrsym+2;
reloc.type = PEOBJ_RELOC_ADDR32NB;
owrite(ctx, &reloc, PEOBJ_RELOC_SIZE);
}
{ /* Write .xdata section. */
uint16_t xdata[8+2];
uint16_t xdata[8+2+6];
PEreloc reloc;
xdata[0] = 0x01|0x08|0x10; /* Ver. 1, uhander/ehandler, prolog size 0. */
xdata[1] = 5; /* Number of unwind codes, no frame pointer. */
xdata[0] = 0x01|0x08|0x10; /* Ver. 1, uhandler/ehandler, prolog size 0. */
xdata[1] = 0x0005; /* Number of unwind codes, no frame pointer. */
xdata[2] = 0x4200; /* Stack offset 4*8+8 = aword*5. */
xdata[3] = 0x3000; /* Push rbx. */
xdata[4] = 0x6000; /* Push rsi. */
@@ -273,8 +285,14 @@ void emit_peobj(BuildCtx *ctx)
xdata[6] = 0x5000; /* Push rbp. */
xdata[7] = 0; /* Alignment. */
xdata[8] = xdata[9] = 0; /* Relocated address of exception handler. */
xdata[10] = 0x01; /* Ver. 1, no handler, prolog size 0. */
xdata[11] = 0x1504; /* Number of unwind codes, fp = rbp, fpofs = 16. */
xdata[12] = 0x0300; /* set_fpreg. */
xdata[13] = 0x0200; /* stack offset 0*8+8 = aword*1. */
xdata[14] = 0x3000; /* Push rbx. */
xdata[15] = 0x5000; /* Push rbp. */
owrite(ctx, &xdata, sizeof(xdata));
reloc.vaddr = sizeof(xdata)-4; reloc.symidx = 1+2+nrsym+2+2;
reloc.vaddr = 2*8; reloc.symidx = 1+2+nrsym+2+2;
reloc.type = PEOBJ_RELOC_ADDR32NB;
owrite(ctx, &reloc, PEOBJ_RELOC_SIZE);
}