| Message ID | 20230801232745.4125-7-deller@gmx.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | linux-user: brk fixes | expand |
Hi Helge, On 2/8/23 01:27, Helge Deller wrote: > Show the memory location of the heap in the /proc/pid/maps file inside > the guest. Store the heap address in ts->heap_base, which requires to > make that variable accessible for all guest architectures, not just > architectures for semihosted binaries (arm, m68k, riscv). > > Note that /proc/pid/maps in the guest needs to show target-aligned > addresses. This is fixed in this patch, so now the heap and stack > address for architectures like sparc64 and alpha now show up in that > output as well. > > Show 32- and 64-bit pointers with 8 digits and leading zeros (%08x/%08lx). > For 64-bit we could use %16lx, but we mimic the Linux kernel, which shows > even 64-bit addresses with %08lx. You are describing 3 changes, do you mind splitting in 3 patches? Otherwise LGTM. > Example: > > user@machine:/# uname -a > Linux paq 5.15.88+ #47 SMP Sun Jan 15 12:53:11 CET 2023 aarch64 GNU/Linux > > user@machine:/# cat /proc/self/maps > Linux p100 6.4.4-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Jul 19 16:32:49 UTC 2023 aarch64 GNU/Linux > 5500000000-5500009000 r-xp 00000000 fd:00 570430 /usr/bin/cat > 5500009000-550001f000 ---p 00000000 00:00 0 > 550001f000-5500020000 r--p 0000f000 fd:00 570430 /usr/bin/cat > 5500020000-5500021000 rw-p 00010000 fd:00 570430 /usr/bin/cat > 5500021000-5500042000 rw-p 00000000 00:00 0 [heap] > 7000000000-7000001000 ---p 00000000 00:00 0 > 7000001000-7000801000 rw-p 00000000 00:00 0 [stack] > 7000801000-7000827000 r-xp 00000000 fd:00 571555 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1 > 7000827000-700083f000 ---p 00000000 00:00 0 > 700083f000-7000841000 r--p 0002e000 fd:00 571555 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1 > 7000841000-7000843000 rw-p 00030000 fd:00 571555 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1 > 7000843000-7000844000 r-xp 00000000 00:00 0 > 7000844000-7000846000 rw-p 00000000 00:00 0 > 7000850000-70009d7000 r-xp 00000000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 > 70009d7000-70009ed000 ---p 00187000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 > 70009ed000-70009f0000 r--p 0018d000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 > 70009f0000-70009f2000 rw-p 00190000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 > > Signed-off-by: Helge Deller <deller@gmx.de> > --- > include/exec/cpu_ldst.h | 4 ++-- > linux-user/main.c | 2 ++ > linux-user/qemu.h | 4 ++-- > linux-user/syscall.c | 13 +++++++++---- > 4 files changed, 15 insertions(+), 8 deletions(-) > > diff --git a/include/exec/cpu_ldst.h b/include/exec/cpu_ldst.h > index 645476f0e5..f1e6f31e88 100644 > --- a/include/exec/cpu_ldst.h > +++ b/include/exec/cpu_ldst.h > @@ -72,10 +72,10 @@ > */ > #if TARGET_VIRT_ADDR_SPACE_BITS <= 32 > typedef uint32_t abi_ptr; > -#define TARGET_ABI_FMT_ptr "%x" > +#define TARGET_ABI_FMT_ptr "%08x" > #else > typedef uint64_t abi_ptr; > -#define TARGET_ABI_FMT_ptr "%"PRIx64 > +#define TARGET_ABI_FMT_ptr "%08"PRIx64 > #endif This is patch #1, > > #ifndef TARGET_TAGGED_ADDRESSES > diff --git a/linux-user/main.c b/linux-user/main.c > index dba67ffa36..fa6e47510f 100644 > --- a/linux-user/main.c > +++ b/linux-user/main.c > @@ -946,6 +946,7 @@ int main(int argc, char **argv, char **envp) > } > } > > + info->brk = TARGET_PAGE_ALIGN(info->brk); Patch #3, > target_set_brk(info->brk); > syscall_init(); > signal_init(); > @@ -955,6 +956,7 @@ int main(int argc, char **argv, char **envp) > the real value of GUEST_BASE into account. */ > tcg_prologue_init(tcg_ctx); > > + ts->heap_base = info->brk; Patch #3, > target_cpu_copy_regs(env, regs); > > if (gdbstub) { > diff --git a/linux-user/qemu.h b/linux-user/qemu.h > index 802794db63..7a6adac637 100644 > --- a/linux-user/qemu.h > +++ b/linux-user/qemu.h > @@ -121,11 +121,11 @@ typedef struct TaskState { > #ifdef TARGET_M68K > abi_ulong tp_value; > #endif > -#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV) > + Patch #3, > /* Extra fields for semihosted binaries. */ > abi_ulong heap_base; > abi_ulong heap_limit; > -#endif > + > abi_ulong stack_base; > int used; /* non zero if used */ > struct image_info *info; > diff --git a/linux-user/syscall.c b/linux-user/syscall.c > index 475260b7ce..dc8266c073 100644 > --- a/linux-user/syscall.c > +++ b/linux-user/syscall.c > @@ -8078,8 +8078,9 @@ static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps) > MapInfo *e = (MapInfo *) s->data; > > if (h2g_valid(e->start)) { > - unsigned long min = e->start; > - unsigned long max = e->end; > + /* show page granularity of guest in /proc/pid/maps */ > + unsigned long min = TARGET_PAGE_ALIGN(e->start); > + unsigned long max = TARGET_PAGE_ALIGN(e->end); Patch #2, > int flags = page_get_flags(h2g(min)); > const char *path; > > @@ -8090,14 +8091,18 @@ static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps) > continue; > } > > + path = e->path; > + > + if (ts->heap_base && h2g(min) == ts->heap_base) { > + path = "[heap]"; > + } Patch #3 but see below, > #ifdef TARGET_HPPA > if (h2g(max) == ts->info->stack_limit) { > #else > if (h2g(min) == ts->info->stack_limit) { > #endif > path = "[stack]"; } else if (ts->heap_base && h2g(min) == ts->heap_base) { path = "[heap]"; > - } else { > - path = e->path; > } > > count = dprintf(fd, TARGET_ABI_FMT_ptr "-" TARGET_ABI_FMT_ptr > -- > 2.41.0 > >
Hi Philiplle, On 8/2/23 07:41, Philippe Mathieu-Daudé wrote: > On 2/8/23 01:27, Helge Deller wrote: .. >> Show 32- and 64-bit pointers with 8 digits and leading zeros (%08x/%08lx). >> For 64-bit we could use %16lx, but we mimic the Linux kernel, which shows >> even 64-bit addresses with %08lx. > > You are describing 3 changes, do you mind splitting in 3 patches? Yes, will do... >> @@ -8090,14 +8091,18 @@ static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps) >> continue; >> } >> >> + path = e->path; >> + >> + if (ts->heap_base && h2g(min) == ts->heap_base) { >> + path = "[heap]"; >> + } > > Patch #3 but see below, Ok...but (see below)... >> #ifdef TARGET_HPPA >> if (h2g(max) == ts->info->stack_limit) { >> #else >> if (h2g(min) == ts->info->stack_limit) { >> #endif >> path = "[stack]"; > > } else if (ts->heap_base && h2g(min) == ts->heap_base) { > path = "[heap]"; > You can't put it into the "else" part here... then heap will never show up (as heap and stack often share the same region). Since "heap" is logically at smaller address than stack, I moved the hunk above the "stack" part. >> - } else { >> - path = e->path; >> } >> >> count = dprintf(fd, TARGET_ABI_FMT_ptr "-" TARGET_ABI_FMT_ptr Thanks for the review! Helge
diff --git a/include/exec/cpu_ldst.h b/include/exec/cpu_ldst.h index 645476f0e5..f1e6f31e88 100644 --- a/include/exec/cpu_ldst.h +++ b/include/exec/cpu_ldst.h @@ -72,10 +72,10 @@ */ #if TARGET_VIRT_ADDR_SPACE_BITS <= 32 typedef uint32_t abi_ptr; -#define TARGET_ABI_FMT_ptr "%x" +#define TARGET_ABI_FMT_ptr "%08x" #else typedef uint64_t abi_ptr; -#define TARGET_ABI_FMT_ptr "%"PRIx64 +#define TARGET_ABI_FMT_ptr "%08"PRIx64 #endif #ifndef TARGET_TAGGED_ADDRESSES diff --git a/linux-user/main.c b/linux-user/main.c index dba67ffa36..fa6e47510f 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -946,6 +946,7 @@ int main(int argc, char **argv, char **envp) } } + info->brk = TARGET_PAGE_ALIGN(info->brk); target_set_brk(info->brk); syscall_init(); signal_init(); @@ -955,6 +956,7 @@ int main(int argc, char **argv, char **envp) the real value of GUEST_BASE into account. */ tcg_prologue_init(tcg_ctx); + ts->heap_base = info->brk; target_cpu_copy_regs(env, regs); if (gdbstub) { diff --git a/linux-user/qemu.h b/linux-user/qemu.h index 802794db63..7a6adac637 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -121,11 +121,11 @@ typedef struct TaskState { #ifdef TARGET_M68K abi_ulong tp_value; #endif -#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV) + /* Extra fields for semihosted binaries. */ abi_ulong heap_base; abi_ulong heap_limit; -#endif + abi_ulong stack_base; int used; /* non zero if used */ struct image_info *info; diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 475260b7ce..dc8266c073 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8078,8 +8078,9 @@ static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps) MapInfo *e = (MapInfo *) s->data; if (h2g_valid(e->start)) { - unsigned long min = e->start; - unsigned long max = e->end; + /* show page granularity of guest in /proc/pid/maps */ + unsigned long min = TARGET_PAGE_ALIGN(e->start); + unsigned long max = TARGET_PAGE_ALIGN(e->end); int flags = page_get_flags(h2g(min)); const char *path; @@ -8090,14 +8091,18 @@ static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps) continue; } + path = e->path; + + if (ts->heap_base && h2g(min) == ts->heap_base) { + path = "[heap]"; + } + #ifdef TARGET_HPPA if (h2g(max) == ts->info->stack_limit) { #else if (h2g(min) == ts->info->stack_limit) { #endif path = "[stack]"; - } else { - path = e->path; } count = dprintf(fd, TARGET_ABI_FMT_ptr "-" TARGET_ABI_FMT_ptr
Show the memory location of the heap in the /proc/pid/maps file inside the guest. Store the heap address in ts->heap_base, which requires to make that variable accessible for all guest architectures, not just architectures for semihosted binaries (arm, m68k, riscv). Note that /proc/pid/maps in the guest needs to show target-aligned addresses. This is fixed in this patch, so now the heap and stack address for architectures like sparc64 and alpha now show up in that output as well. Show 32- and 64-bit pointers with 8 digits and leading zeros (%08x/%08lx). For 64-bit we could use %16lx, but we mimic the Linux kernel, which shows even 64-bit addresses with %08lx. Example: user@machine:/# uname -a Linux paq 5.15.88+ #47 SMP Sun Jan 15 12:53:11 CET 2023 aarch64 GNU/Linux user@machine:/# cat /proc/self/maps Linux p100 6.4.4-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Jul 19 16:32:49 UTC 2023 aarch64 GNU/Linux 5500000000-5500009000 r-xp 00000000 fd:00 570430 /usr/bin/cat 5500009000-550001f000 ---p 00000000 00:00 0 550001f000-5500020000 r--p 0000f000 fd:00 570430 /usr/bin/cat 5500020000-5500021000 rw-p 00010000 fd:00 570430 /usr/bin/cat 5500021000-5500042000 rw-p 00000000 00:00 0 [heap] 7000000000-7000001000 ---p 00000000 00:00 0 7000001000-7000801000 rw-p 00000000 00:00 0 [stack] 7000801000-7000827000 r-xp 00000000 fd:00 571555 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1 7000827000-700083f000 ---p 00000000 00:00 0 700083f000-7000841000 r--p 0002e000 fd:00 571555 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1 7000841000-7000843000 rw-p 00030000 fd:00 571555 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1 7000843000-7000844000 r-xp 00000000 00:00 0 7000844000-7000846000 rw-p 00000000 00:00 0 7000850000-70009d7000 r-xp 00000000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 70009d7000-70009ed000 ---p 00187000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 70009ed000-70009f0000 r--p 0018d000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 70009f0000-70009f2000 rw-p 00190000 fd:00 571558 /usr/lib/aarch64-linux-gnu/libc.so.6 Signed-off-by: Helge Deller <deller@gmx.de> --- include/exec/cpu_ldst.h | 4 ++-- linux-user/main.c | 2 ++ linux-user/qemu.h | 4 ++-- linux-user/syscall.c | 13 +++++++++---- 4 files changed, 15 insertions(+), 8 deletions(-) -- 2.41.0