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commit 41d3053e27e5be8f5d3f7e6f2880e046b43387be
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Author: philippe <philippe@a5019735-40e9-0310-863c-91ae7b9d1cf9>
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Date: Thu Jun 4 19:44:47 2015 +0000
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On platforms that have an accessible redzone below the SP, the unwind logic
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should be able to access the redzone.
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So, when computing fp_min, substract the redzone.
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Currently, only amd64 and ppc64 have a non 0 redzone.
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Regtested on amd64 and ppc64le, no regression.
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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15309 a5019735-40e9-0310-863c-91ae7b9d1cf9
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--- valgrind-3.10.1/coregrind/m_stacktrace.c.orig 2014-11-25 20:41:21.000000000 +0100
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+++ valgrind-3.10.1/coregrind/m_stacktrace.c 2015-06-07 16:20:31.962739322 +0200
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@@ -76,7 +76,20 @@
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} \
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}
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-
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+/* Note about calculation of fp_min : fp_min is the lowest address
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+ which can be accessed during unwinding. This is SP - VG_STACK_REDZONE_SZB.
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+ On most platforms, this will be equal to SP (as VG_STACK_REDZONE_SZB
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+ is 0). However, on some platforms (e.g. amd64), there is an accessible
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+ redzone below the SP. Some CFI unwind info are generated, taking this
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+ into account. As an example, the following is a CFI unwind info on
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+ amd64 found for a 'retq' instruction:
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+[0x400f7e .. 0x400f7e]: let cfa=oldSP+8 in RA=*(cfa+-8) SP=cfa+0 BP=*(cfa+-16)
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+ 0x400f7e: retq
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+ As you can see, the previous BP is found 16 bytes below the cfa, which
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+ is the oldSP+8. So, effectively, the BP is found 8 bytes below the SP.
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+ The fp_min must take this into account, otherwise, VG_(use_CF_info) will
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+ not unwind the BP. */
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+
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/* ------------------------ x86 ------------------------- */
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#if defined(VGP_x86_linux) || defined(VGP_x86_darwin)
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@@ -192,7 +205,7 @@
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uregs.xip = (Addr)startRegs->r_pc;
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uregs.xsp = (Addr)startRegs->r_sp;
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uregs.xbp = startRegs->misc.X86.r_ebp;
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- Addr fp_min = uregs.xsp;
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+ Addr fp_min = uregs.xsp - VG_STACK_REDZONE_SZB;
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/* Snaffle IPs from the client's stack into ips[0 .. max_n_ips-1],
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stopping when the trail goes cold, which we guess to be
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@@ -473,7 +486,7 @@
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uregs.xip = startRegs->r_pc;
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uregs.xsp = startRegs->r_sp;
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uregs.xbp = startRegs->misc.AMD64.r_rbp;
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- Addr fp_min = uregs.xsp;
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+ Addr fp_min = uregs.xsp - VG_STACK_REDZONE_SZB;
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/* Snaffle IPs from the client's stack into ips[0 .. max_n_ips-1],
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stopping when the trail goes cold, which we guess to be
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@@ -654,7 +667,7 @@
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# elif defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux)
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Addr lr = startRegs->misc.PPC64.r_lr;
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# endif
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- Addr fp_min = sp;
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+ Addr fp_min = sp - VG_STACK_REDZONE_SZB;
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/* Snaffle IPs from the client's stack into ips[0 .. max_n_ips-1],
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stopping when the trail goes cold, which we guess to be
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@@ -917,7 +930,7 @@
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uregs.r12 = startRegs->misc.ARM.r12;
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uregs.r11 = startRegs->misc.ARM.r11;
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uregs.r7 = startRegs->misc.ARM.r7;
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- Addr fp_min = uregs.r13;
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+ Addr fp_min = uregs.r13 - VG_STACK_REDZONE_SZB;
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/* Snaffle IPs from the client's stack into ips[0 .. max_n_ips-1],
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stopping when the trail goes cold, which we guess to be
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@@ -1061,7 +1074,7 @@
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uregs.sp = startRegs->r_sp;
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uregs.x30 = startRegs->misc.ARM64.x30;
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uregs.x29 = startRegs->misc.ARM64.x29;
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- Addr fp_min = uregs.sp;
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+ Addr fp_min = uregs.sp - VG_STACK_REDZONE_SZB;
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/* Snaffle IPs from the client's stack into ips[0 .. max_n_ips-1],
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stopping when the trail goes cold, which we guess to be
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@@ -1155,7 +1168,7 @@
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D3UnwindRegs uregs;
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uregs.ia = startRegs->r_pc;
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uregs.sp = startRegs->r_sp;
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- Addr fp_min = uregs.sp;
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+ Addr fp_min = uregs.sp - VG_STACK_REDZONE_SZB;
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uregs.fp = startRegs->misc.S390X.r_fp;
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uregs.lr = startRegs->misc.S390X.r_lr;
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@@ -1238,7 +1251,7 @@
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D3UnwindRegs uregs;
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uregs.pc = startRegs->r_pc;
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uregs.sp = startRegs->r_sp;
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- Addr fp_min = uregs.sp;
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+ Addr fp_min = uregs.sp - VG_STACK_REDZONE_SZB;
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#if defined(VGP_mips32_linux)
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uregs.fp = startRegs->misc.MIPS32.r30;
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